Citronic SM650 User manual

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SM65O INIII
PROFESS IONAL MIX ING DESK
SM55O TEIII
PROFESS IONAL MIX ING DESK
OWNER'S MANUAL
IIIII Itllr
2, SM65O FRONT & REAR PANEL
3. INTRODUCTION
4. WARRANTY & SAFETY
(TMPORTANT)
7. TECHNICAL SPECIFICATIONS &
FEATURES
Mlc 1 and Mic 2
lnput Channels rl-4
Maln AB Output
Monltorlng
Auxlllary Systems
lnfll Systems
Eq lnsert
16. INSTALLATION AND USE
Before You Start
Aux Effects and lnfil Systems
Uslng The Front Panel Controls
Mlxlng Facilities
19. INTERNAL OPTIONS
21 . AUDIO SPECIFICATIONS
22, BLOCK SCHEMATIC DIAGRAMS
26. INDEX
25. SM55O FRONT & REAR PANEL
CENTRE PULLOUT
DJ User Guide

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Citronic Limited, innovative leaders in the manufacture of
professional audio equipment, are proud to present the
SM550 REMIX and the SM650 REMIX mixers; two new
products that transcend all performance, function and
installation specifications currently available on any other
mixing unit.
Established in Melksham, Wiltshire in 1972, the company
occupies prestigious purpose built factory headquarters and
is one of the leading employers in the area.
The company's award -winning product range covers
professional audio equipment, installation separates and
consoles for discotheques. Each unit is manufactured'
to the highest possible standards, and all have an enviable
reputation for reliability and value for the money - the noted
hallmark of Citronic products.
Substantial investment has been made in high technology
CAD systems, manufacturing control and testing
techniques. This sophisticated computerisation, coupled
with an extensive research and development programme,
enables the company to offer an exceptional degree of
manufacturing excellence and quality assurance.
Citronic has always listened carefully to the customer, and
places tremendous emphasis on market research. This
ensures that the exacting requirements of the installer and
operator are complemented, without compromise,
throughout the entire product range. This unique approach,
coupled with a strong input from a highly qualified
engineering team, ensures that Citronic maintains it's
position as a respected leader in the industry's
development.
Citronic has an international distribution network throughout
Europe, Asia and the Americas.
SM65O REMIX AND SM55O REMIX
The Citronic SM650 REMIX and SM550 REMIX are botl"t
10 input stereo mixers, purpose built for the hi - tech
discotheque that demands the latest technology for
professional mixing DJ's.
Both mixers feature the "Punch" button - a unique
innovation that enables the user to transform, dub beat and
remix inputs to create an original sound.
A fully assignable crossfade between all four input
channels, independent channel Eq, auxiliary effects send
and return (three separate effect buses on the SM650),
infil systems and a 3 band mic Eq (mid frequency sweep
on SM650) are just some of the prime features of these
remarkable. creative mixers.
The SM650 is housed in a rugged, 6u high standard rack
mount unit, while the SM550 is 5u high. Both mixers' main
outputs are factory set at OdB, however internal adjustment
can alter this setting to +4dB or +8d8.
It is strongly recommended that the user thoroughly reads
this handbook, which gives advice on installation, features
and how to operate your chosen mixer to the best
advantage.
EIIII

Wiring
WARNING - THIS APPARATUS MUST BE EARTHED
IMPORTANT: The wires in the mains lead are coloured in
accordance with the following code:
Green and Yellow
Blue
Brown
: Earth
: Neutral
: Live
As the colours of the wires in the mains lead of this product
may not correspond with the coloured markings identifying
the terminals in your plug, proceed as follows:
The green and yellow wire must be connected to the
terminal marked "E" or shown by the safety earth symbol
or coloured green or green and yellow.
The blue wire must be connected to the terminal marked
"N", or coloured black.
The brown wire must be connected to the terminal marked
"L", or coloured red.
Earthlng
IMPORTANT - Both mixers are hard-ear1hed, ie. mains
earthed equipment. Lift the signal eafth from all other
ancillary equipment to avoid earth . loops, which create
unwanted buzz and hum.
Under no clrcumstances should you disconnect the
earth wlre ln the maln AC supply of any ancillary
equlpment. Consult the relevant manual supplied in order
to lift the signal earth correctly.
The Citronic SPX range of processors are sott-earthed and
no adjustment is required for complete compatibility with the
SM range. The PPX range of amplifiers feature an earth
lift switch on the rear panel, enabling you to harmonise your
sound system by using only top quality Citronic products.
Power supply
The mixer is supplied with it's own separate power supply
unit which may be mounted in any position. Care should
be taken, however, to ensure that there is adequate
ventilation around the power supply heatsink, and that all
signal wiring is routed away from the power supply.
The voltage rating is factory set to match European and
U.K. standards, ie. 220-240V. Check this setting on the
rear of the unit. For use in Canada and the USA, the
voltage rating should be set at 110 -120V.
ln order to comply with international safety standards,
power supplies are fitted with a moulded multi-standard
mains plug. For use in the U.K. this plug will need to be
replaced with a standard 13 amp plug fitted with a 3 amp
fuse.
Slgnal connectlons
Make all connections to turntable, CD and tape decks using
good quality stereo phono or RCA phone Jack leads. The
importance of this is often overlooked, and is the frequent
cause of complaints about poor performance and output
quality.
lmportant note: - SM650 only
Your mixer will have been supplied with four Phono Jump
leads which you may need to insert, please refer to the
section "lnstallation and Llse" BEFORE attempting to
operate the SM650.
Remote starts
Both latching action and momentary action remote stafi
switches . are suitable for low voltage, low current
applications only. Under no circumstances should
mains-connected or high current loads be switched directly.
As with all equipment, if you are in any doubt, consult your
dealer.
Packaging
Ensure that all faders are set at the maximum before
attempting to replace the mixer in its original packing case.
lf this is not done, they will foul on the inner packing
material.
MAINTENANCE AND GUARANTEE
Maintenance
NO SPECIAL PREVENTATIVE MAINTENANCE IS
R EQU IH ED
As with all high quality audio equipment, the overall
performance is highly dependent upon healthy connection
leads. lt is therefore essential that these are checked
periodically for wear and tear and replaced as necessary.
Although all Faders are vedically mounted, it is still
important to avoid spilling liquid onto your mixer, as this
may cause damage to the precision electronics.
Guarantee
This product is guaranteed to the original purchaser against
defects in material and wokmanship for one year from the
date of initial purchase. Activate this guarantee at the time
of purchase by returning the Guarantee card to the address
below. Keep a copy of your sales receipt for proof of
guarantee status, should it be necessary.
lf a malfunction occurs, the dealer who supplied the unit wilr
be happy to handle the repair. When returning a unit, use
the original factory carton - do not chance inadequate
packing materials. Simply tape a note to the top of the unit
describing the malfunction.
lf your unit is out of guarantee, we recommend that you
return it to an authorised Citronic dealer for repair or
service. Experienced personnel, supported by specialist
testing equipment, will be able to find and correit the fault
in the most efficient and cost-etfective way.
ln the UK:
Citronic Limited
Halifax Road
Bowerhill
Melksham
Wiltshire SN12 6UB Telephone: [phone]
Fax: [phone]

ITTIr
SM65O TEEII
PROFESSIONAL MIXING DESK
SM55O TEIIT
PROFESSIONAL MIXING DESK
INSTALLERS GUIDE
EIIII IIIIE

For reference purposes, the mixer has been split into
sections, namely:
Mic lnputs 1 and 2;
Music lnPut Channels 1-4;
Channel A and Channel B Output (Rear);
Channel A and Channel B Output (Front);
Monitor Section;
Auxiliary and lnfil SYstems.
Each section details the rear and front of the mixer where
applicable, and is illustrated with a schematic diagram or
drawing to act as a quick visual aid. ln addition, each part
of the mixer is numbered to correlate with the written
information.
.:.:.:.:.:.:...:.:..'.':.......:.:....'.......':.:...:.....:':.:'......:..':':..'.'."'..'.'
i:i:ftr; Uit iii;tea wath ; gi"y box surround ocscriues,:,:
,i,ifeatures that are found on the SM650 only, and do not,,;'
::::ennly !9 9w19T? 9l !P 9M9!9, ::::
A full view of the front and rear panels for the SM650
and SM550 are shown on the inside of the front and
back covers, pages 2 and 25 respectively. These can be
folded out whlle you refer to the manual.
lmportant Note
Both mixers feature a common auxiliary effect loop, known
as AUX2 on the SM650, and AUX on the SM550. For
reference purposes, this loop will be indicated as AUX2
throughout this manual. Owners of the SM550 should,
therefore, relate the information to their AUX controls.
Any reference to 0dBm on control dials assumes that the
input has been cued to the blue OdB marker on the Bar
Graph Display and that preceding level controls are at
maximum.
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MIC
2
REAR PANEL
1: Mic lnput
3 pin XLR input socket.
Balanced input wiring:
Unbalanced input wiring:
Pin2 Positive,
ground,
3: Clip lndicator LED
For maximum safety, this warning light will show 4dB
prior to clipping and remain on for one second. For
fufther information, refer to the "How to Use" section
in this manual.
4: Gain Control
Allows maximum microphone control, and will
accommodate all microphones, both low and high
impedance to 600ohms. This control should be us6d
in conjunction with the Clip lndicator, and with slight
adjustment will otfer optimum output level.
Gain Range = 30-60d8.
For further information, refer to the "How to Use"
section in this manual.
S: ,i,iFrequdrricy Coritfol ,::,
i,;,Qweeps the mid filter frequency between 300H2 and,,i,
..:.
6: Mic Eq
ln-dependent_3 Band microphone equalisation system,
offering 12dB cut and boost on all three filters.
Low Filter = shelving type, operating @ 90H2.
Mid Filter = Peak Dip type, operating @ ZKHz
(sweepable between 300H2 and SKHr on the SM650)
High Filter = shelving type, operating @ 1OKHz.
7: Aux2 Send Control
Controls the level from the mic input to the master
auxiliary send output in stereo. Note that the Aux2
effect loop is post-fade, and therefore active in
relation to the Fader position.
8: ::::Auxl Selection Button ,,i,
ii,'Converts the effects programmed into the channel to i:i,
i:i:run on the Auxl Mono loop instead of the Aux2 Stereo::ii
,',,loop. Both loops are podt{ade, however Auxl is fori:i:
:i:idedicated mic effects and is unaffected by the pan i,ii
:,iiOontrol. :i:i
l:l:
g: iiiiPan Control ::::
:i,iAffords complete control and adjustment of the:':,
:,i,microphone and Aux2 effects from full left to full right,:i:i
i':'without affecting the music output or balance. ,i,'
10: On Air Button
Activates or deactivates the mic without the need to
adjust the master fader.
11: Master Fader
100mm/60mm Studio Quality Fader. Controls the level
of microphone to the main AB Output.
+12
0
-12
oI
ON AIR
EIIII

INPUT CHANNELS 1&2 - CD / LINE
REAR PANEL
12: GD Llne
Standard Stereo Phono sockets.
lnput lmpedance = Typically l0Kohms
Source lmpedance = 2Kohms (Max.)
sensitivity = 250mV RMS (-10dBm).
13: Llne lnput
Standard Stereo Phono sockets. lmpedance and
Sensitivity as CD Line above.
14: Remote Start
Standard 3.5mm Jack socket. A normally open switch
contact, operated via the latching action start button
which closes the contacts.
Do not exceed the maximum applied voltage, 30V DC,
and use only a very low current. (100mA max.)
INPUT CHANNELS 3&4 PHONO / LINE
I
CD
INPUT CHANNELS-1.4: CD/LINE & PHONO/LINE
FRONT PANEL
18: lnput Selectlon Button
Selects either CD or Line input on Channels 1&2, and
Phono or Line input on Channels 3&4.
19: lnput Gain Control
Allows maximum input control, and will accommodate
most source material.
Gain Range = -10d8 to +10d8
lnput Level (min) = 250mV FIMS (-10dBm)
lnput Level (max) = 2.35V HMS (+10dBm).
20::::Balance Control ,i,i
:,:'Allows complete stereo image control and correction of i::i
:':,tne source input. i'i'
t,tiflglgg. . .=.t/:6dB Left or Right. :i:i
21: Channel Eq
An_independent channel equalisation system, offering
6dB cut and boost on both (SM550) or all three
(SM650) filters.
Low Filter = Shelving Type, operating @ GOHz.
i:iMiQ fiter ; P.-e?li Dip- tipi, qpiteriils @:f RHi: i:i:
High Filter = Shelving Type, operating @ 1OKHz.
222 Aux2 Send Control
A post fade stereo auxiliary effect control, which adjusts
the level from the music input. This is active in relation
to the Fader position.
Presents the input signal to the PPM display and
headphones for agcurate pre-fade, monitoring, cueing
and gain. The LED indicates when the channel cue is
active.
25: X-Fade Channel Selector
Selects X or Y side of the crossfader. When the
crossfader is off, the selector must indicate X to
achieve any output through the Fader control. This
condition is shown by the green LED.
For further information, refer to the "How to Use"
section in this manual.
26: Punch Button
Creates such effects as transforming, dub beat, etc. by
transposing the signal onto both X and Y channels.
The Punch Button can be used independently to the
crossfade.
For further information, refer to the "How to Use"
section in this manual.
27: Start Button
Latching action start on CD/Line Channels 1&2, and
momentary action staft on Phono/Line Channels 3&4.
For further information, refer to the "Options" section in
this manual.
28: Master Fader
100mm/60mm Studio Quality Fader. Controls the
program level to the main AB output. Full travel
operation is normal.
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REAR PANEL
15: Phono lnput
RIAA Equalised Stereo
lnput lmpedance
Source lmpedance
Sensitivity
Phono sockets.
= 4TKohms
= Typical magnetic cartridge
= 3.8mV RMS (-46dBm).
16: Llne lnput
Standard Stereo Phono sockets. lmpedance and
Sensitivity as CD Line above.
17: Remote Start
Standard 3.5mm Jack socket. A normally open switch
contact, operated via the momentary action staft button.
Channels 3&4 are therefore Technics SL1200
compatible. A latching operation version is available as
an option - see "Options" section in this manual.
Do not exceed the maximum applied voltage, 30V DC,
and use only a very low current. (100mA max.)
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IIIEO

CHANNEL A (LEFT) AND CHANNEL B (RIGHT)
OUTPUT
For ease of reference, this section deals with only the main
AB Output and does not, therefore, examine the monitoring
facilities or auxiliary and infil systems found on both mixers.
REAR PANEL
29: Left.Output (Balanced)
3 pin XLR output socket.
Electrically balanced output wiring
Pinl Ground, Pin2 Positive, PinS Negative.
Output lmpedance = <SOohms
Load lmpedance (min) = 600ohms
REAR PANEL
37: Program Output
Standard Stereo Phono sockets. Allows for a music
only program stereo output, which is unaffected by the
program EQ lnseft. This would normally be used for
the DJ Booth to offer a program only monitoring facility.
Output lmpedance = <S0ohms
Load lmpedance (min) = 2Kohms
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OUTPUT B
UNBAL
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Output Level = variable
For further information, refer to
section in this manual.
to +14dBm.
the "How to Use"
FRONT PANEL
38: Cue/Output Display
A 10 segment dual display with PPM characteristics.
This will indicate the output until an input cue is
selected. Features a OdB blue reference marker which
correlates to the internal output setting, factory set at
775mV RMS (0dBm). The integral Clip LED warning
light will warn 4dB prior to the true clip.
Range = -20d8 to +3dB.
For further information, refer to the "How to Use"
section in this manual.
39: Program Send Level Control
Provides level control of the music program only output
in stereo, ideal for the DJ booth.
Output Level = variable to +14dBm.
For reference, note that OdBm is approximately 6 on
the dial.
For further information, refer to the "How to Use"
section in this manual.
40: Headphone Socket
Standard Stereo 114" Jack.
Left Channel = Tip
Right Channel = Ring
Ground = Sleeve
lmpedance
Range = 30-400ohms (300mW-150mW)
41: Headphone Volume Control
Set as desired.
42: Headphone Pan Control
Varies the mix between the cued input and the main
AB output, ideal for accurate beatmixing. Full lett will
give full cued input, full right will give full monitor output.
For further information, refer to the "How to Use"
section in this manual.
Output Level
Optional Levels
For further information,
this manual.
= Factory set at 775mY RMS
(0dBm)
= 1.23V RMS (+4dBm);
1.95V RMS (+8dBm).
refer to the "Options" section in
PRt]GRAH
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30: Left Output (Unbalanced)
Unbalanced Standard Dual Mono Phono sockets. Note
that either or both sockets can be used, provided that
the combined load impedance does not fall below the
stated figure.
Output lmpedance = <S0ohms
Load lmpedance (min) = 2Kohms
Output Level = Factory set @ 775mY RMS
(0dBm).
Optional Levels
For further information,
this manual.
= 1.23V RMS (+4dBm);
1.95V RMS (+8dBm).
refer to the "Options" section in
31: Rlght Output (Balanced)
3 pin XLR output socket. See "Left Output (Balanced)"
above.
32: Rlght Output (Unbalanced)
Unbalanced Standard Dual Mono Phono sockets. See
"Left Output (Unbalanced)" above.
FRONT PANEL
33: AB Output Level Fadens
Vertically mounted, high quality Hard Action Faders.
Maximum output will correlate to the cued inputs @
34: X-Fade Onioff
Activates or deactivates the crossfader.
35: Crossfader
Purpose-built light action crossfader. Mixes the stereo
output between the inputs pre-selected to X and Y on
the crossfader. Note that there will not be any
noticeable affect in the sound pressure level on the
dance floor when music signals are on both X and Y
channels.
For further information, refer to the "How to Use"
section in this manual.
36: Stereo/Mono Button
Semi countersunk to avoid accidental use. Atfects the
main AB Output, while program send and infil send
remain in stereo.
For further information, refer to the "How to Use"
section in this manual.
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AUXILIARY SYSTEMS
The SM550 features a general processing loop, called
AUX, while the SM650 featu res three auxiliary
systems. As with all other sections, auxiliary systems
relating to the SM650 only are clearly identified.
AUXl
REAR PANEL
43:i:iAux1 Send Output i;,'
:i::Standard Dual Mono Phono sockets. i':,
':,iAllows for a mono post fade, mic only signal processing:;i;
i:i:system, such as Reverb and Echo. 'iii
':i,rubte that either or both sockets can be used, provided':,:
,::'ttrat the combined load impedance does not fall Oelow,i'i
i,i,tne stated figure. ;":
:i::Output lmpedance = <S0ohms. ,,,,
,i':Load lmpedance (min) = 2Kohms. .,:'
iii:Output Level = variable to +14dBm. :',,
i:l:,,,'
a+i,t,Arrf Return lnput ::::
i'i,standard Stereo'Phono sockets. ',,,
i':iReturns the processed mic signal to the main AB output i,:'
i,,'miX. i,i,
;i;:lnput lmpedance = l0Kohms ,',,
ii:isource I'mpedance = 2Kohms (Max.) :,i,
i:i:Sensitivity = 300mV RMS (€dBm). ,i,,
i',iNote thaf a Mono Return signal must be connected to:i::
i,i,Ootn Left and Hight inputs for normal mono operation.::i:
FRONT PANEL
45:::iAuii Send Levei Contioi ,,:,
i,,'Provides level control for the mono post fade Auxl :::,
;,i'Output mic mix. ,!i,
:::iOutput Level = vsrisble to +14dBm. :::,
'i,iFor reference, note that OdBm is approximately 6 on ',,,
i,:,tne Oiat. ,,,,
,i,,For further information, refer to the "How to Use" iii,
i:;;section in this manual. :::,
+Oiii,Auxf Return Level Control :::i
' ;i;:Varies the input level, in stereo, onto the main AB :,,,
ii:ioutput. Set hs per desired effect. ,,,,
AUi 2
REAR PANEL
472 Aux2 Send Output
Standard Stereo Phono sockets.
A stereo post fade program and/or post fade mic
program output,. used for signal processing such as
reverb or sampling.
Output lmpedance = <SOohms
Load lmpedance (min) = 2Kohms
Output Level = variable to +14dBm.
48: Aux2 Return lnput
Standard Stereo Phono sockets.
Varies the input level, in stereo, onto the main AB
Output.
lnput lmpedance = 'l0Kohms
Source lmpedance = 2Kohms (max.)
Sensitivity = 300mV RMS (-8dBm)
FRONT PANEL
49: Aux2 Master Send Level Control
Provides the master level control for the stereo
aux2 mix.
Output Level = variable
For reference, note that 0dBm is
the dial.
For fufther information, refer to
section in this manual.
to +14dBm.
approximately 6 on
the "How to Use"
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UNBAL
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50: Aux2 Return Level Control
Varies the input level, in stereo, onto the main AB
output.
Set as per desired effect.
For further information, refer to the "How to Use"
section in this manual.
AUXS
REAR PANEL
51i:::Aui3 Send Outpui " " "':i:i
i,i:Standard Stereo Phono sockets. i:i:
i'i,Allows for a stereo pre-fade, music only infil system, i|i,
i'i'such as background music in remote aieas. i,:,
,,,'Output lmpedince = <S0ohms i,i'
,:;:Load lmpedance (min) = 2Kohms :::i
,i;;Output Level = variable to +14dBm. :::.
FRoNi PAGI
szi',,Auxg Send Levei coniiol' " """i,i,
,:':Provides level control for the stereo pre fade AuxS :i:,
,i:,Output music mix. :::i
i:::Output Level = variable to +14dBm. lii,
,',,For reference, note that 0dBm is approximately O on i:;,
::::the dial. :i:i
,,.'for further information, refer to the "How to Use" i'i,
:i:isection in this manual. :':'
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RTN I SEND
IIEIII

INFIL SYSTEMS AND Eq INSERT
Both mixers feature the lnfil 1 system, while the SM650
features an additional infil system and an Eq lnsert. All
connections and controls are found on the rear of your
chosen mixer. The infil and Eq inserts that relate to the
SM650 only are clearly marked for your convenience.
INFIL 1
53: lnfll 1 Pan Gontrol
A mono output pan control of the microphone and
music program mix, providing an independent program
mic mix for infil systems.
For fufiher information, refer to the "How to Use"
section of this manual.
54: lnfll 1 Volume Control
Controls the level of the infil output signal.
55: lnfll 1 Output
Standard Dual Mono Phono sockets.
Can be switched internally to otfer a sub-lcass dance
floor infil.
Note that either or both sockets can be used, provided
that the combined load impedance does not fall below
the stated figure.
Output lmpedance = <SOohms
Load lmpedance (min) = 2Kohms
Output Level = variable to +14dBm
For further information, refer to both the "Options" and
"How to Use" sections in this manual.
INFIL 2
s6liiiliifll 2 'Pa'n cdiitiol :.,i
iii,A stereo output pan control of the microphone and:ii:
::;imusic program mix, affording a complete level remix:,:,
:i::facility of the overall program output. This is ideal for:i;:
iii,zoned and dedicated infil systems. The option for:i,:
i,i'stereo or mono output is selected internally. ,','
:;:,For fufther information, refer to both the "How to Use" i:i,
:,i,and the "Options" sections in this manual. !:!:
:i',;,,:
STt,ilnfll 2 Volume Controt ,,,'
i:,lControts the level of the infil output signal. :l::
s8i:i:tnfll 2 Output i:i:
:,:,standard Siereo Phono sockets. ,,'!
:,i,Allows for an independent program mix, specificalty for:,:,
,,',intit systems. I':,
,i,:Output lmpedance = <S0ohms il,,
i;i:Load lmpedance (min) = 2Kohms ',,i
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Eq INSERT
59: Left Eq lneert
Standard Mono Phono sockets.
A pre-master Fader program only Eq send and return
insert. Note that the send and return output levels are
independent of the main AB output level setting option.
Send lmpedance = <S0ohms
Load lmpedance (min) = 2Kohms
Output Level = 775mY RMS (OdBm) Fixed
Return lmpedance = l0Kohms
Source lmpedance = 2Kohms (max)
Sensitivity = 775mV RMS (OdBm) Fixed.
lf the Eq lnsert is not in use, then fit the phono link
lead supplied.
60: Rlght Eq lneert
Standard Mono Phono sockets. See "Lett Eq lnsed"
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IIEIII
The SM650 and SM550 perfectly combine high technology
with ease of operation and installation. This section is
primarily for the installer, and details how to get the best
out of your mixer.
It does not aim to be an "idiots guide", and will not,
therefore, detail the more familiar and obvious controls.
As with other sections, each control is identified by it's
number given under Technical Specifications (where
applicable), and points that relate only to the SM650 are
clearly identified.
BEFORE YOU START
This mixer is hard-earthed, so ensure that you lift the signal
earth from all other ancillary equipment to avoid earth loops.
Consult the manual supplied to lift the earth correctly
- under no clrcumstances should you dlsconnect the
earth ln the maln AC supply of ancillary equlpment.
We always recommend the use of Citronic ancillary
equipment to ensure quality throughout your sound system.
The SPX range of processors have a Soft-Eafthed signal
path and require no adjustment, while the PPX range of
amplifiers have an eafth lift switch fitted to the rear panel.
Both these product ranges are perfectly compatible with
your SM mixer.
Any turntables to be fitted should be eafthed to the earth
stud located on the rear panel above the power socket.
GENERAL INSTALLATION HINTS
The mixers are 19" wide, designed for standard rack
mounting. The SM550 is 5u high, the SM650 6u high. The
power supply can be mounted in any position, but ensure
that there is adequate ventilation around the heatsink and
all signal wiring is routed away from the power supply. The
power lead supplied is connected via the 4 pin XLR socket
sited in the middle of the rear panel.
Eq $end and Return
The 4 phono link leads supplied (Eq Send-Return links)
should be connected as follows: Two fitted on the left hand
side of the rear panel between LEFT Eq SEND and
RETUHN, and RIGHT Eq SEND and RETURN; two fitted
on the right hand side between MIC 1 Eq SEND and
RETURN, and MIC 2 Eq SEND and RETURN.
lf you do not connect these links, no sound will come out
of your mixer!
lf you intend to use an external signal processing unit,
these links will not be used. To obtain optimum results from
the use of an external equalisation unit, such as the EQ250,
depress the STEREO/MONO button (36:) which will conveft
the program output to mono.
Adjusting your room equalisation in mono is far easier than
in stereo. Once the external equalisation has been set,
depress the button once more to conved back to stereo.
Outputs - Main AB Output
We have already examined the options available for output,
ie. OdBm, +4dBm or +8dBm. Ensure that you have the
correct setting to configure with the other components of
your sound system.
Note that both mixers feature balanced (29:,31:) output or
unbalanced (30:,32:) output.
Outputs - Auxiliary and lnfil
All auxiliary and infil outputs allow for up to +14dBm.
When, for example, using amplifiers with a 0dBm 775mY
sensitivity, attenuate the amplifier input to match the
maximum sound level. The same will apply to signal
processing equipment.
It is a good idea to remember that DJ's will, on occasion,
increase the output controls on auxiliary etfects to the
maximum - you have been warned!!
AUXILIARY EFFECT LOOPS AND INFIL SYSTEMS
Auxl
:':,Tiiej SM650 ieaiijies a o6oiCairio rrrtic eitteCts bop; nijii. 'i'i
,'i,This mono loop is post-fade, and can be used for discreet:iii
;iiiprocessing such as reverlc, noise gate or echo, and will run I'i,
':.'independently of any auxiliary music processing. To run:,:;
i;:;programmed effects on the Auxl loop, press the Auxl ,:,:
'iiiselection Button (8:). iiii
;,,,fne amount of effect on each microphone channel it,:l:
':':controlled by the Aux2 Send Control (7:). The overall i;i;
i'i,amount of effect is controlled via the Master Send Level :i:i
'i,iControl (43:) and the Return Level Control (44:) on the front::i:
,,,,panet. Note that 0dBm is approximately 6 on the Send iii:
,,i,Level dial. :i:i
:i:,fne Return input is stereo to accommodate many mono to ';i1
,i,:stereo effects, however, if the return is Mono then wire the:i:i
,,,;signat to both left and right inputs for normal mono,i::
':.:
Aux2
Both mixers feature the stereo general processing loop,
Aux2. This should be used for any auxiliary effects and
processing, such as interfacing with delay and reverlc or
sampling. Set the'master send (47:) to match the output
level with the input level on the ancillary equipment.
The Aux2 Send Controls (72,222) allow you to mix the effect
on each channel individually. The master level will control
the overall amount sent to the etfects processor.
AuxS
i:::The SM650 Tdatur65 h' d6oiC{iidd''Muiid'only 6ff&iS c;utpiji,'iii
:,:,nuxS. This stereo output is pre-fade, and is ideal for:iii
',,,background music in remote areas such as the restaurant,il;
,i;'or quiet bar, as it allows any of the 4 input channels to be i'i'
;,i,useO for otf-line sampling or routed to another play area. iiii
'i,:Aux3 is activated via the Aux3 Selection Button (23:). :':,

lnfll 1
Both mixers feature an independent mono program/mic mix,
lnfil 1. This can be switched internally to otfer a sub-bass
dance floor infil. The filter is an 18dB/Octave roll-off and
produces €dB at 60H2.
By using the Pan Control (53:), the output mix can be
varied between program and microphone. The level of
output is controlled via the Volume Contr0l (54:) on the rear
of the mixer.
It is impofiant to note that either or both output sockets
(55:) can be used, provided that the combined load
impedance does not fall below 2Kohms.
lnfll 2
i,:iTne SMOS0 features a stereo (mono switchable) :,i,
;i;:independent program mix, ideal for remote areas. This i,;;
i,i,may also be used for monitor or booth output, with the:i::
,i,ivolume controlled from the rear of the mixer (57:). The pan i:i:
iii;controt (56:) will remix the level between the mic and music ii:'
::::prog ram. i:i:
.....r....Y.
USING THE FRONT PANEL CONTROLS
Mlc Channels
Both channels will accept balanced and unbalanced
microphones with a maximum impedance of 600ohms (1:).
This impedance range covers all quality microphones.
Levels should be set using the Gain (4:), the Eq (5:) and
the Clip lndicator (3:). Firstly, adjust the gain control until
the clip indicator lights on peak, not normal use. Retard
the setting slightly to create the maximum signal to noise
ratio. Set the Eq as desired, and recheck the level with
the clip indicator, fine tuning as necessary.
lnput Channels 1-4
Channels 1&2 are switchable between CD/Line inputs, and
3&4 are switchable between Phono/Line inputs (18:). All
channels feature remote start switches (17:) (latching and
momentary), input gain control (19:), Aux gain control (22:)
and independent channel Eq (21:).
Select the input and activate the cue selector (24:). Adjust
the gain input to achieve OdB, indicated on the LED display
(38:). Compensate for tonal differences in inputs via the
Channel Eq, and readjust the gain. Note that full travel
operation of the master channel fader (27:) is normal.
Cueing
The four main input channels feature Cue Select buttons
which, when activated, route the input signal onto the LED
display and into the headphones. lf none of the four input
channels are cued the Bar Graph Display and Headphone
default to the main output program.
The LED has a reference OdB blue maker which correlates
to the internal setting, and has an integral clip LED warning
light that warns 4dB prior to the true clip. The input gain
control should be adjusted to read OdB, as this will create
optimum signal to noise ratio.
The headphone pan control (422) varies the mix between
the selected cue input (full left) and the main program
output (full right). For premixing and beatmixing adjust the
pan control to suit. lf cueing input signals in isolation set
the pan control at full left.
Output
The main AB Output is controlled via the master faders
(33:), and maximum output will correlate to the cued inputs
at 0dB. Set as required.
The Program Send Level Control (39:), allows for the DJ
booth program only level setting. Note that 0dBm is
approximately 6 on the dial. This should be set as desired;
however care should be taken to eliminate the possibility
of feedback.
Ensure that the amplifier input level is matched to allow for
maximum program send. DJ's will, on occasion, increase
the Send Level control to the highest setting.
MIXING FACILITIES
Both mixers feature extensive mixing facilities, having been
designed to accommodate the needs of both professional
mixing disc jockeys and clubs that require the latest
technology.
Crossfading
Each music input channel features a X-Fade selection
button (25:), which allows the user to select either the X
or Y (left or right) side of the crossfader (35:). The
crossfader is activated by the On/Off button (3a:).
With the Crossfader off, the selection button must indicate
green, or X position, to achieve any output. lf the channel
is left in red, or Y, the channel output will nc' be activated.
When the Crossfader is oh, this mode creates a fully
assignable crossfade allowing any input or combination of
inputs to be placed on either side.
Firstly, ensure that the playing channel X or Y assignment
corresponds with the position of the crossfader. Cue and
start the following track, it's channel Fader must also be up,
ensuring that it is assigned to the other side of the
crossfader. When you are ready, sirhply move the Fader
from one side to the other. The speed of this movement
will affect the 'mix' - slowly should create a smooth, running
mix and a quick flick will give a chop mix
- practice will make perfect!
Note; due to careful design, when the Fader is in the centre
position there will not be a noticeable affect in the sound
pressure level on the dance floor.
Two, three or all four channels can be placed on the same
side of the crossfader, which will create some very unusual
and interesting mixing effects!
Transforming
Each of the four music input channels feature the unique
Punch button (26:). This button transforms the channel
input signal onto both X and Y channels, and is effective
in relation to the Fader position.
Punch can be operated with the crossfade in either on or
off mode, and gives the user the abi[ity to punch short
bursts of the music input - a single word, bass effect, etc.
- into the overall program output.
As an example, try the following: Play a track on any input
channel, and move the crossfader to X (if active). Set the
mix track to Y, activate the cue selector on this channel and
move the channel Fader to maximum. Listen to the beat
on the headphones, and punch in on the beat - the result
on the main output will be interesting, to say the least!
Using the Punch button etfectively, will enable the user to
create very exciting remix etfects. Dub beats, drop ins,
transforming, beat edit and deadbeat are all possible - with
a little practicel
Note: when the punch button is used as described, then
depending on the program material, there may be an
increase in signal level of up to 3dB. lt might be wise to
cater for these possible situations when setting up the
amplification system.
For furlher mixing information see DJ Pull-out.

This section is designed to demonstrate to owners of both
models the various options that are available. As with all
other sections in this manual, options that apply to the
SM650 model only are clearly indicated.
For ease of reference, where applicable, the numbers
collate with the Technical Specification section.
Remote Starts (17t and 27:l
The remote stafts on input channels 3&4 - Phono/Line
inputs - are factory fitted as momentary action start buttons.
Latching operation remote stafis are available, should you
wish to connect alternative turntables to the mixer. This
option can be stipulated when ordering, or selected by
consulting your dealer. Simply ask him to order Part No
SWPBSPU N2PL.
Balanced and Unbalanced Outputs (29:,30:,31: and 32:)
The output level of both left and right outputs are factory
set at 77SmV RMS (OdBm). This output can be changed
to give either: 1.23V RMS (+4dBm); or 1.95V RMS (+BdBm)
to configure with almost any sound system.
The adjustment for the output setting is internal, accessible
from the base of the mixer, and selected via the 6 switch
block as shown in diagrar@
Eq Defeat on lnput Channels
lnput channels 1- 4 are fitted with Eq defeat switches,
located internally on the PCB in question. One switch
defeats the Lo/Hi filters, and the other defeats the Mid Filter.
Note that the Mid Filter is only relevant to the SM650.'
See diagram @ opposite.
lnfll 1 - Sub Bass Fllter Option
The lnfil 1, a mono program only infil, can be switched
internally to otfer a sub-bass option for the dance floor. This
works by simply eliminating all medium and high frequency
signals, and provides a very useful additional bass op!q!
to your dance floor output. See location diagram @
opposite.
Top Panel
(removed)
Top of Mixer
NOTE : Do not remove the screw located
above the "M" of "SM" as this is for an
earth connection and not for removing
the top panel.
Bottom Panel
(removed)
,-Ei'oo]
Lt-bll
LH
(Botlom ol Mixer)
EI
BYPASS
.,,,T.,.
(Bottom of Mixer)
BALANCED AND UNBALANCED OU,TPUTS - DIAGRAM O
ffop of Mixer)
EQ DEFEAT ON INPUT CHANNELS
.DIAGRA'@
ffop of Mixer)
tNFtL 2 - srEREo/MONo sWlrCH - DTAGRAM @
SWITCH 12345 6
0ON OFF OFF ON OFF OFF
+4 OFF ON OFF OFF ON OFF
+8 OFF OFF ON OFF OFF ON
'Both output and Display are set the same

INPUTS :Sensltivlty lnput Source
lmpedance lmpedance
Mlc 2mV -52dBm 2k Ohms 150 Ohms
Mlc lneert Rtn 1.95V + SdBm 10k Ohms 2k Ohms
Phono 3.8mV -46dBm 47k Ohms 500 Ohms
CD 250mV -10dBm 10k Ohms 2k Ohms
Llne 250mV -10dBm 10k Ohms 2k Ohms
Aux Retum 300mV - SdBm 10k Ohms 2k Ohms
Max
Galn
63dB
0dB
S/N Frequency
(A/B Output Response)
(600 ohms) (+0-1dBm)
76dB 30Hz to 25KHz
THD + Nolse
(1kHz)
0.015%
1 8dB
1 8dB
1 6dB
75dB
93dB
93dB
95dB
Mln Load
lmp.
2k Ohms
5k Ohms
2k Ohms
2k Ohms
2k Ohms
2k Ohms
2k Ohms
2k Ohms
600 Ohms
2k Ohms
2kOhms
25Hz to 40KHz
25Hz to 40KHz
30Hz to 40KHz
0.015%
0.003%
0.003%
0.003%
OUTPUTS :Nomlnal
Ouput
Level
lnsert Send 1.95V+8dBm
EQ lnsert Send 775mV0dBm
1 Send Variable
2 Send Variable
3 Send Variable
Output (Un-Bal) 775mV OdBm
1 .23V +4dBm
1 .95V +8dBm
Output (Bal) as Un-Bal except
1 (mono) Variable
2 Variable
Mlc
A/B
Aux
Aux
Aux
A/B
A/B
lnfil
lnfil
NOISE FLOOR :
A/B Output
MIC. PRE.AMP :
Total Equlvalent
lnput NolEe
(150 Ohm Source)
PHONES :
Load
Power
Frequency Response
EQUALISATION :
MIc Range , Frequency
Lo +l-12d8 90Hz
-95d8 (referred to output level setting)
-128.SdBm
30 - 400 Ohms
300mW (30 Ohms) &150mW (400 Ohms)
140H2 - 30KHz (+0 -1dB)
(Low Frequency Energy Limlted)
Type
Shelving
Output
lmp.
<50 Ohms
300 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
<50 Ohms
,i,iUtO +l-12d8 300H2-8kHz Band Pass/Reject Q=l .6 i,i,
HI +l-12d8 10kHz Shelving
NB Mld band +/-12dB @ 2kHz for SM550
Muelc Range Frequency Type
Lo +/-6dB 60Hz Shelving
ii:iuto +/-6dB l KHz Band pass/Reject Q=0.5 i:ii
HI +/-6dB 10KHz Shelving
SUB.BASS OUTPUT
INFIL 1 : 18dB/octave filter -3dB at 60H2.
POWER SUPPL
DIMENSIONS :
sM650
anllr
220 - 240V 50VA
483mmx266mmx11Omm 483mm x 222mm x 11Omm
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SM55O TEIII
PROFESSIONAL MIXING DESK
Notes:
Numbers marked * refer to the SM650 model only.
Complete front and back panels diagrams for both the
SM650 and SM550 can be found on the inside front and
rear covers, pages 2 &. 25 respectively.
Nu mber Title Page
1: Mic lnput B.
2z Mic lnsert B.
3: Clip lndicator B.
4: Gain Control B.
5:* Frequency Control 8.
6: Mic EQ B.
7: Aux2 Send Control 8.
8:* Auxl Selection B,
9:* Pan Control 8.
10: On/Off Air 8.
11 : Master Fader B.
12: CD Line lnput L
13: Line lnput 9.
14:. Remote Start 9.
15: Phono lnput 9.
16: Line lnput g.
17: Remote Start g.
18: lnput Selection 10.
19: lnput Gain Control 10.
20:r Balance Control 10.
21: Channel EQ 10.
22: Aux2 Send Control 10.
23:* Aux3 Selection 10.
24: Cue Selector 10.
25: X-Fade Selector 10.
26: Punch 10.
27: Start 10.
28: Master Faderl0.
29: Left Output Balanced 11 .
30: Left Output 11 .
31: Right Output Balanced 11 .
32: Right Output 11 .
33: AB Output Levels 11 .
34: X-Fade On/Off 11 .
35: Crossfader 1'l .
36: Stereo/Mono 11 .
37: Program Output 12.
38: Cue/Output Display 12.
39: Program Send Level 12.
40: Headphone Socket 12.
41: Headphone Volume 12.
42: Headphone Pan 12.
43:* Aux'l Send Output 'lg.
44:r Auxl Return Output 13.
45:* Auxl Send Level .l3.
46:* Auxl Return Level 13.
47: Aux2 Send Output .l3.
48: Aux2 Return lnput 13.
49: Aux2 Send Level 13.
50: Aux2 Return Level 14.
51:* Aux3 Send Output 14.
52:* AuxS Send Level 14.
53: lnfil 1 Pan Control 15.
54: lnfil 1 Volume Control 15.
55: lnfil 1 Output 15.
56:* lnfil 2 Pan Control 15.
57:* lntil 2 Volume Control 15.
58:* lnfil 2 Output 15.
59:* Left EQ lnsert 15.
60:* Hight EQ lnsert 15.
FRONT PANEL
REAR PANEL
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SM65O IEIII
PROFESS IONAL MIX ING DESK
SM55O TETII
PROFESSIONAL MIXING DESK
DJ USER GUIDE
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INTRODUCTION
Welcome to the exciting world of Citronic Remix mixers -
professional, quality units that otfer facilities and functions
far exceeding all others currently on the market.
The SM650 and SM550 both feature extensive mixing
capabilities designed to allow you complete creative control
- the only limitations are your imagination!
Auxiliary effect facilities mean that you can extend the mix
by processing the mic s(7nal, program output or both with
reverlc, echo and sampling. A crossfade that is fully
assignable over eight switchable channels and the unique
Punch button complete this array of technical delight.
Looking across the mixer from left to right, you will find the
following inputs:
Micl and Mic2; CD Line 1 and 2; Phono Line 1 and 2.
On the output side, there are Auxiliary Send and Returns,
Program Send, Main AB Output, Crossfader and
Headphone controls.
To help you get the best out of your mixer, everything will
be explained in a simple, logical order.
We trust that you will enjoy the experience!
Note: Please read the notes on page 3 before continuing.
Mlc Channels 1 and 2
Stafting at the top, there are the Clip lndicator, Gain Control
and 3 Band Eq - these all work together to set your level
and match your voice pattern.
Turn the microphone on and adjust the gain control until the
clip indicator lights on peak, but not during normal use.
Now slightly retard the gain control, as the peak indicator
should not light when set correctly. Set your Eq as desired,
and recheck the level with the clip indicator, fine tuning as
necessary.
Once this is done, you will have set the mic level to achieve
optimum signal to noise ratio - in simple terms, the best
sound quality from your mic.
The Aux2 Send Control determines the level of etfects from
the mic input to the master Aux Send output. This will
normally be connected to effects such as delay. This Aux2
loop is post-fade, and therefore actMe depending on the
Fader position.
ii:'ttote that SM650 owners have the option to switch from i'i,
:i:iAux2 to Auxl effect loop - this gives you the opportunity i;:;
::::to aOO several etfects to the mixer, with Auxl dedicated to iii:
ii:ithe microphone channels only. Using Auxl with a reverb ii:i
liiiprocessor will add tremendous depth and warmth to your 'iii
i:i,voice. :iii
::i:StrrtOSO owners will also find a Pan Control - this pans tne:i:i
iliimicropnone from lett to right and woks independently of the:;ii
ii,imain program output. This can be fun when used with some iiii
i:::effects. ::::
Finally, the fader controls the level of microphone to the
main AB output. Once this is set, there is no need for
adjustment as the On/Off Air button will activate or
deactivate your mic.
lnput Channels 1-4
The four channels will take a total of eight inputs - selected
by the switch at the top left of each channel. Channels 1
and 2 offer CD or Line input, and Channels 3 and 4 otter
Phono or Line input.
Whichever you choose, you should first adjust the Gain
control. This is done by activating the Cue Selector, which
will route the input signal onto the LED display and into the
headphones. lncrease the gain control until the LED
display reads OdB (the BLUE marker) on the scale, and set
the headphone level as desired.
lf you are about to mix, adjust the headphone pan control
to get the balance between main output and cued input
- this will help tremendously!
The independent Eq (two band on the SM550, three on the
SM650) will help to compensate for tonal ditferences in your
inputs, which is a great help when playing old records or
album tracks followed by CD. Each band offers a cut and
boost of +l- 6dB, which is enough to help with smooth
mixing.
The Aux2 Send Control does exactly the same as the Aux2
Send control on the microphone channel, ie adjusts the
level of effects onto the main Send control.
ii,:owners ijf ihe SMoSti"witr' iind d sijieCiioii Biriiciii ihii''i'i
ii;:converts the auxiliary etfects to run on Aux3, a pre-fade iii,
i,i,stereo output. This is ideal for running remote areas that::::
;i;'require background music only, and is arranged by sending,:ii
i':'tne selected input that may or may not be part of your live;i,i
,ii.*'- ::::
:ii,lf the installer has connected a channel to Aux3, ensure that;:,i
':i'you leave the fader down unless you want to include the ii:i
:::,output in your show, and be careful not to adjust the input j::i
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The fader controls the program level to the main ouput,
and full travel operation is normal. The remote starts are
latching action on CD/Line channels, and momentary action
on Phono/Line channels.
Crossfadlng and Mlxlng Facllltlee
The four main input channels feature the X-Fade Channel
Selector button, which allows you to place the input on
either the X or Y sde of the crossfader. One, two, three
or all four channels can be placed on either side, which will
give some amazing mixing effects.
When the crossfader is off, the selection button must
indicate green, the X position, to get any output from the
channel. lf you leave the channel in Y position, with the
LED showing red, no sound will come out of the channel.
With the crossfader on, you have a fully assignable
crossfade, allowing you to create smooth beatmixes
between any of the input channels - very impressive for
live work. The light action will also enable you to perform
excellent chop mixes.
NOTE: Full transformer facilities remain operational when
the crossfade is otf.
lf you are not familiar with crossfaders, try this simple
crossfade'mix'. Firstly, ensure the playing track is assigned
to X, the crossfader is on and in position X. Cue and start
another input channel on Y, making sure the Fader is up
to the maximum level. When you've matched the beat, or
feel ready, simply move the crossfade from X to Y and there
it is, a crossfade mix! A quick flick of the crossfader will
give a chop mix, while a slower, gradual movement will
create a running mix or beatmix - practice will make perfect!
Remember that you are not limited to one channel per side
of the crossfader. Two, three or all four channels can be
assigned to (for example) X, which will create some very
unusual and interesting mixed effects!
To aid accurate beatmixing, the headphones feature a
Headphone Pan control (labelled Cue / O/P), that will vary
the mix between the selected cue input (full left) and the
main program output (full right). Simply adjust and set as
desired.
While crossfading may be familiar to you, the Punch button
on the music input channels may not. This Punch button
transforms the input signal onto both X and Y output
channels, and is effective in relation to the channel fader
position. This unique system can be operated with the
crossfader on or off, and creates some stylish mixing
oppoftunities. lt gives you the ability to punch short bursts
of the music input - a single word or phrase, bassline, beat,
hi-hat, etc. - into the overall program output.
Here are some examples:
Transforming, Drop-ln and Dub Beat: Set your Base or
Main track to X and place the crossfader (if active) to X.
Set the overdub or mix track to Y, and cue/premix. Using
the 'phones, simply punch in where appropriate.
To deadbeat the main track, simply press the Punch button
while it b playing and hold it down. Switch the selector to
Y, and release on the beat.
While the principle of the Punch button remains the same,
the creative mixing styles are endless. Using the Punch
button effectively will enable you to create your own exciting
remixes, live. Dub beats, drop ins, transforming, beat edit,
deadbeat and hip hop are just some examples of the
technical wizardry you can perform with a little practice!!
Ouput Sectlon
The Stereo/Mono button atfects the main AB output, while
the program sends remain in stereo. This button is primarily
for the installer to set any external equalisation in mono,
and has been deliberately semi-countersunk to avoid
accidental use.
The Aux2 Send provides the master level control for the
Aux2 effect mix. OdB is approximately 6 on the dial, so
resist the temptation to turn the level to maximum. This
will only result in distortion and affect your signal to noise
ratio - so.leave it alonel Talk to the installation engineer
regarding it's setting if necessary.
The Aux2 Return varies the input level of effects onto the
main AB output. Set as per the desired effect, but do not
overdo it - a little is always better than too much.
Cueing, monitoring and output display are shown on the
LED bar graph. Match your cued inputs to the 0 marker
shown, and try to avoid any clipping, as this can only cause
damage in the long term.
The main output is controlled by the AB Output faders, and
maximum output will correlate to the cued inputs at 0dB.
Set as required, but remember that it is often louder on the
dance floor than you think. You will almost ceftainly not be
in the main sound pressure field as well as sutfering a
temporary reduction in the sensitivity of your hearing as the
show progresses.
The Program Send Control adjusts the level of the program
only output. This would normally be used in the DJ booth
for monitoring purposes. Note that OdBm is approximately
6 on the dial, so resist the temptation to increase the setting
to maximuml Consult the installation engineer regarding
the maximum setting if necessary.
As we have already explained, the Headphone Pan control
will vary the headphone mix between cued input and
program output. Set as per desired etfect, as with the
volume control.
Auxl Send and Return, AuxS Send - SM650 Only
i,::The SM650 features two additional auxiliary etfect loops - i,ii
1,;inuxf and Aux3. The Auxl Send Control controls tne eveliii,
,:,:of effects from the mic channel. OdBm is approximately i;;;
i':,6 on the dial, and so, as with all other auxiliary controls;iii
:,:iavoid setting the control to maximum! Consult with tne i,i,
,i,iinstallation engineer if necessary regarding the maximum iiii
:;:,setting. :tii
:i::The Auxl Return Control varies the input level of i,:,
i;:,microphone etfects onto the main AB output. Set as per i::i
,','OesireO effect. ii:i
:,:,f inatty, the Aux3 Send Level Control provides a level control::::
.,':for tne Aux3 output. Aux3 is the stereo pre-fade music only:i:i
,,,,mix for background music systems, and 0dBm is i,ii
,:,iapproximately 6 on the dial. Consult with the installation i,:'
i',,engineer and the management regarding the setting leveliiii
',',- don't turn the remote area into another full scale i:i'
,:,:discotheque by increasing to maximum! :iii
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of each control in this section. lf you require fufther
information on your mixer, ask to see the lnstallation
manual which will explain the technical performance and
specifications of the mixer.
EIIII IIIIE

lmportant Note
Both mixers feature a common auxiliary etfect loop, known
as AUX2 on the SM650, and AUX on the SM550. For
reference purposes, this loop will be indicated as AUX2
throughout this manual. Owners of the SM550 should,
therefore, relate the information to their AUX controls.
Any reference to OdBm on control dials assumes that the
input has been cued to the blue OdB marker on the Bar
Graph Display and that preceding level controls are at
maximum.