Choice Select MX -8S User manual

MX-8S
CHO3070

MX -8S MIXER
8 Channels Mic/Line
CONTENTS
A. INTRODUCTION
B. MONO INPUT CHANNELS
C. STEREO CHANNEL SECTION
D. MASTER SECTION
E. INSTALLATION
F. CONNECTIONS
G. SPECIFICATION
K. BLOCK DIAGRAM

A. INTRODUCTION
SAFETY INSTRUCTIONS
CAUTION: To reduce the risk of electrical shock, do not remove
the cover(or back). No user serviceable parts inside;
refer servicing to qualified personnel.
WARNING: To reduce the risk of fire of electrical shock, do not
expose this appliance to rain or moisture.
1
4 Mono input channels with XLR, TRS and balanced line inputs
Ultra-low noise discrete Mic Preamps with +48V Phantom Power
2 stereo input channels with balanced TRS and RCA
Extremely high headroom-offering more dynamic range
2 additional multi functional Stereo Line Inputs
Balanced input for high signal integrity
Ultra-musical 3-band EQ on all channels
Peak LEDs all Mono and stereo channels
1 Aux sends per channel for external effects and monitoring
Separate Master Mix, control room and Headphone Outputs.
2-Track inputs assignable to Master Mix, control room/headphone output
Highly accurate 10 segments Level Meters
Rugged design Power Supply ensures superior signal integrity

11
0
0
0
LEFT
+15
+15
RIGHT
-
8
-
8
PRE
PEAK
GAIN
AUX
PAN
TRIM
LINE 1
-10
+4
1
2
3
BAL OR
UNBAL
4
5
7
10
8
9
HIGH
MID
0
0
0
0
0
-15
-15
LEFT
+15
+15
+15
+15
6LOW
0
-15 +15
RIGHT
-
8
-
8
PRE
PEAK
GAIN
AUX
PAN
EQ
A. INTRODUCTION
Channels 1-4 of MX-8S are mono channels, with a choice of balanced Mic or Line inputs.
The 4 other channels are stereo channels, they are convenient for MIDI signals
and signals from electronic instruments. The AUX send function of this mixer is post-fader.
The AUX return function has 2 outputs that can be linked to a MIDI receiver or
an electronic instrument. All numbers below in brackets refer to figure 1.
B. MONO INPUT CHANNELS
Every mono channel is fitted with an XLR microphone input (1) and a balanced TRS
line input (2). Phantom power can be switched on at the rear panel (29). The trim circuit
Features a large range from -10dB to +60dB.
Set the strength of the mic input signal via the trim control (3). Every channel is fitted with
a PEAK LED (9). If it flashes or lights up, you have to reduce the signal. Otherwise the
channel will be overloaded. Watch this LED especially if you use very heavy EQ settings
(these LEDs show the post EQ signal).
Every mono input channel has its own 3 band EQ. The high button (4) sets the high
frequencies, the mid button (5) the medium frequencies and the low button (6) the low
frequencies. All three bands have a cut and boost up to 15d B and a center position of 0.
The AUX send (7) is post-fader. This button controls the signal
strength to the AUX terminal. The gain to the master is set via the channel volume button (10).
The channel Pan (8) sets the position of the stereo output. Whatever the position may be
there should be no difference in the volume level.
C. STEREO INPUT CHANNELS
Every stereo channel has two TRS balanced inputs for a stereo line input signal. If
only the left input is connected, this channel will work exactly as a mono channel.
The stereo inputs are designed for any line input signal. Most line sources such as MIDI
instruments and FS units have their own output level control. The units without output level
control such as CD players have an output level which is within the range of the MX-8S.
If the channel and master faders are set to the same level, the Vu-meters will display a
value between -4 and -7dB.
The only difference with the mono EQ is that a stereo channel includes no low-cut filter
as this equalizer is stereo and not mono.
The AUX send function on a stereo channel works exactly as on a mono channel. The stereo
signal should be bridged to a mono signal.
The only difference with a mono channel is the implementation of a balance/pan button (11).
This button determines the balance between the left and right signal that is sent to the right
and left master output. If a stereo channel is used in mono mode (only the right is connected)
the balanced button operates as a pan control in mono mode.
D. MASTER SECTION
The AUX send signal is applied to unbalanced TRS jacks (21). Set the input level of the
effect unit to the output level of the mixer. If your effect unit is not fitted with a gain control,
you can amplify the signal via the AUX send button (7) up to 15dB.
There is an additional stereo input (AUX Return) on your mixer. The level of this input can
be set via the AUX return button (12). This input is permanently affected to the master
output. If a connector is plugged into this input, the AUX return function works with a mono
signal. This input allows you to create a wet mix¡¯.
The output level of the master section is displayed via a 10 LED barograph vu-meter (13).
Two other LEDs indicate ON/OFF(14) and phantom power ON/OFF(15).
Peaks are shown on the vu-meter around the 0 level. If the vu-meter displays over a longer
period of time +10dB for the signal, the master volume and / or the channel volume must
be reduced. If this is not sufficient, you can still reduce the gain of that channel and / or
the output level of the instrument of effect unit.
2

0
+15-
8
10
10
7
7
4
4
2
2
0
20
POWER +48v
AUX RETURN
0
0
+15
+15
-
-
8
8
-
HEADPHONE
CONTROL ROOM LEVEL
TAPE/REC TO
TAPE/REC TO
CONTROL ROOM
MASTER
MASTER MIX
18
19
12
13
14 15
17
16
The RCA inputs are for connection of a CD player or a turntable. You can
now route the signal via the “tape/rec to control room level” push button (17)
to the studio monitors or to the master routes via the push button “tape/rec
to master” (18). Make sure however that the push button (17) is in the UP
position otherwise the signal will be input twice.
Connect the mixer to an amplifier via the balanced “stereo out” sockets (22).
Use 2 6.3mm mono jacks for this connection. The total output volume is set
via the master volume button (19).
The mixer is fitted with a separate headphone output (23). The signal is the
same as from the control room output (27). The volume control (16) sends the
signal to the headphones and the monitors. The L/R meters are the same as
the same as the master output.
E. INSTALLATION
Use care in making all cable connections correctly. Connect the leads
one by one, checking each connection as you continue.
Incorrect connections might permanently damage the unit.
Figure 2 shows an example of possible connections.
Prior to connecting the mixer, set all controls to 0. You can connect microphone
or line units to the mono channels, all kinds of line units to the stereo channels
and effect units to the AUX return. You can also connect MIDI instruments to
the AUX return.
If you connect a microphone, make sure that the phantom power is switched
OFF. DO NOT use unbalanced units when the phantom power is switched on.
Do not short-circuit the 48V circuit of the phantom power to the ground. You
might damage the unit
If you record something on a DAT or ADAT recorder, do not set the maximum
level. If your recorder can support a level of 96dB, record at a maximum level
of 86-91dB. The peak level must always be 5-10 dB lower that the maximum
level of your recorder.
28 30
29
SERIAL NO: WARNING:
To reduce therisk of fire of
electrical shock, do not expose this
appliance to rain or moisture. Do
not remove chassis (or back). no
user serviceable parts inside
refer servicing to qualified
service personnel.
I
I
o
o
USE THE SUPPLIED
POWER SUPPLY ONLY!
ON
PHANTOM
ON
POWER
AC POWER IN
POWER PROTECT
PROTECT
CLIP
CLIP
SIGNAL
SIGNAL
1
2
POWER PROTECT
PROTECT
CLIP
CLIP
SIGNAL
SIGNAL
1
2
MONO
L
R
LINE
BAL OR
UNBAL
MONO
L
R
LINE
BAL OR
UNBAL
LL
RR
LINE/MONO RIGHT
9-10 11-12
STEREO AUX RETURN AUX SEND STEREO OUT
TAPE / RECORD
PHONE
LINE L/R LINE L/R
TRIM
TRIM
LINE
LINE 2
1
-10
-10
+4
+4
BAL OR
UNBAL
BAL OR
UNBAL
CTRL R OUT
3
22
23
27

F. CONNECTIONS
Refer to the following figures to make sure you use the correct connection cables.
sleeve of TRS jacks.
Headphones
Tip=
Ring=
Left Signal
Ring Signal
Sleeve=
Ground/Shield
unbalanced equipment may be connected to balanced inputs/outputs. Either use mono 1/ 4 jacks or connect ring and
¡±
Output
pin 1
pin 2=(=) Signal
pin 3=(-) Signal
Fig. 6.2:Compensation of interference with balanced connections
11 22
33
Input
Ground (+) Hum +Signal
positive (+)Hum + Signal
Negative
Cable
Shield
(+) Signal +HUM
(-) Signal +HUM
2 x Signal
=Signal + 6dB
Tip
Sleeve
Strain relief clamp
Ring
Unbalanced use of
Tip=
Signal
Sleeve=
Ground/Shield
Tip
Sleeve
Strain relief clamp
Stereo1/ 4 jack plugs
¡±
Ring
4

Unbalanced use of
Tip=
Signal
Sleeve=
Ground/Shield
Tip
Sleeve
Strain relief clamp
Stereo1/ 4 jack plugs
¡±
Ring
For connection of balanced and
unbalanced plugs, ringand sleeve have
to be bridged at the stereo plug.
Balanced use with XLR connectors
1=Ground/Shield
2=hot(+ve)
3=cold(-ve)
Input Output
For unbalanced use pin 1 and pin 3 have to be bridged
11 22
33
5

G.SPECIFICATIONS
Mono Inputs
Mic Input
Bandwidth
Distortion (THD & N)
TRIM range
Line input
Bandwidth
Distortion (THD & N)
Line level range
Equalization
Hi Shelving
Mid Range
Lo Shelving
Stereo Inputs
Line Input
Bandwidth
Distortion (THD & N)
Equalization
Hi Shelving
Mid Bell
Lo Shelving
Master Mix Section
Max Output
G1 and G2 Max out
Send Max out
Signal -To-Noise Ratio
Power Supply
Main Voltages USA/Canada 120V AC, 60Hz, power supply unit MXUL2
Electronically balanced, discrete input configuration
10Hz to 60KHz 3dB
0.01% at +4dBu,1KHz,Bandwith 80KHz
0.01% at +4dBu,1KHz,Bandwith 80KHz
0.01% at +4dBu,1KHz,Bandwith 80KHz
Electronically balanced
10Hz to 60 KHz +-3dB
+10dBu to -40dBu
12KHz +/-15dB
2.5KHz +/-15dB
80Hz +/-15dB
Unbalanced
10Hz to 55KHz +-3dB
12KHz +/-15dB
2.5KHz +/-15dB
+22dBu balanced
+22dBu unbalanced
+22dBu unbalanced
112dB, all channels at Unity Gain
80Hz +/-15dB
+
-
6

MONO INPUT CHANNELS (1-2)
LEFT BUS
LEFT BUS
RIGHT BUS
RIGHT BUS
AUX
AUX
AUX
AUX
AUX SEND
AUX SEND1
TAPE / REC TO MASTER
TAPE / REC TO CONTROL ROOM
TAPE IN
TAPE IN
TAPE IN
TAPE IN
LEFT
LEFT
RIGHT
RIGHT
CTRL R RIGHT
T
T
T
R
R
CTRL ROOM & PHONE
CTRL ROOM
& PHONE
LEFT MASTER
RIGHT MASTER
GAIN
MASTER MIX LEFT
MASTER MIX RIGHT
T
T
T
R
R
R
PHANTOM
+48V
LO
LO
MO
MO
HI
HI
GAIN
GAIN
STEREO LEFT
STEREO RIGHT
STEREO AUX RETURN
LEFT RIGHT
T
T
T
T
R
R
R
R
AUX RET
LEFT BUS
LEFT BUS
LEFT BUS
RIGHT BUS
RIGHT BUS
RIGHT BUS
PEAK
LEFT BUS
RIGHT BUA
AUX
M
M
M
R
CTRL R LEFT
PHONES
7