Rane MP 24z User manual

Manual-1
MP 24z
DJ MIXER
OPERATORS MANUAL
QUICK START
Don't! Quick-starting an MP 24z is like trying to quick-start a 747. It's just not something you do. Trust us, you don’t want to
make mistakes with this sucker. So just this once—please—we highly recommend you read this entire manual: front-to-back, every
single page, every single word. It will familiarize you with the many intricacies of the MP 24z, not to mention all the nooks and cran-
nies.
WEAR PART
is product contains the following wear part subject to the ninety (90) day war-
ranty period described on page Warranty-1: (1) Active Crossover Assembly F 60.
HI-MID TREBLE
+8 dB+5+1 +3
MID
ENGAGE
EQ
BASS
-1 0-3-7-10 -5
LEFT
-20 -15
ENGAGE
MIXER
CUE / PGM
RIGHT
STEREO
PAN
LINE 6 LINE 3
CUECUECUECUE
PH/ AUX 3LINE 3LINE 3 AUX/ PH 2AUX/ PH 1
10
8
6
10
8
6
LINE 2LINE 1 LINE 1 LINE 2 LINE 4 LINE 5 LINE 4
TREBLE
TM
4
2
0
4
2
0
4
3
2
1
ASSIGN
4
3
2
1
ASSIGN
ENGAGE
MAIN
MIC LEVEL
OL
ENGAGE
MIC
LINE 5
LINE 6
ACTIVE CROSSFADER
BOOTH LEVEL
LOOP ZONE LEVEL
PROGRAM EQUALIZER
PEAK PROGRAM METER
POWER
HEADPHONE CONTROL
MASTER LEVEL
SOURCE CONTROL
1
MIC CONTROL
MP 24z
10
8
6
10
8
6
4
2
0
4
2
0
2
10
8
6
10
8
6
4
2
0
4
2
0
3
10
8
6
10
8
6
4
2
0
4
2
0
4
10
8
6
10
8
6
4
2
0
4
2
0
MID
BASS
AUX MIC LEVEL
MIN
2
4
8
6
MAX
0
2
4
8
6
10
0
2
4
8
6
10
MIN
2
4
8
6
MAX
LEVEL
CUE PGM
6
2
6
2
0
2
4
8
6
10
MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
CUE LEFT /
PGM RIGHT
MONO
A
B
0246810
0 2 4 86 10
F 60

Manual-2
FRONT PANEL DESCRIPTION
1POWER “ON” indicator: Illuminates anytime the MP 24z is connected to an appropriate power source (see k, Rear Panel).
2SOURCE CONTROL selectors: Provide Input selection between the various Phono and Line Inputs for their respective mixing
channels.
3Input channel faders: Control the relative Levels of each of the four Input mixing channels.
4Channel CUE selectors: Engaging any single or combination of CUE pushbuttons sends any program present at the respective
channel’s SOURCE CONTROL selector to the Headphone Cue section. e yellow LEDs adjacent to each CUE select button
illuminate when the switch is engaged.
5CROSSFADE ENGAGE switch: Activates the CROSSFADER and disables manual mixing capabilities. e adjacent green LED
illuminates whenever the Crossfader is active.
6Left-hand CROSSFADE ASSIGN switch: Assigns the left side of the Crossfader to any of the four Input channels when the
Crossfader is activated by its ENGAGE switch.
7Right-hand CROSSFADE ASSIGN switch: Assigns the right side of the Crossfader to any of the four Input channels when the
Crossfader is activated by the ENGAGE switch.
8ACTIVE CROSSFADER: Controls the Levels of any two channels assigned to it by the left and right Crossfade ASSIGN
switches when the ENGAGE switch is activated. e entire Crossfader assembly is replaceable from the front panel without disas-
sembling the entire unit. (See Service Information on page Manual-9.)
9ENGAGE MIC switch: Enables the Microphone Inputs to feed the Booth, Zone, and Main Outputs. e adjacent red LED
flashes whenever the ENGAGE MIC switch is down and locked. is switch also activates a “ducker” circuit in the Booth
Output.(SeeFront Panel tand Rear Panel p.)
0MAIN MIC LEVEL control: Sets the Level of the balanced low impedance MAIN MIC Input.
qAUX MIC LEVEL control: Sets the Level of the unbalanced high impedance AUX MIC Input, often used for wireless mics.
wMicrophone equalization controls: Adjust the frequency contour of both Microphone Inputs. ey have no effect on any other
program material.
HI-MID TREBLE
+8 dB+5+1 +3
MID
ENGAGE
EQ
BASS
-1 0-3-7-10 -5
LEFT
-20 -15
ENGAGE
MIXER
CUE / PGM
RIGHT
STEREO
PAN
LINE 6 LINE 3
CUECUECUECUE
PH/ AUX 3LINE 3LINE 3 AUX/ PH 2AUX/ PH 1
10
8
6
10
8
6
LINE 2LINE 1 LINE 1 LINE 2 LINE 4 LINE 5 LINE 4
TREBLE
TM
4
2
0
4
2
0
4
3
2
1
ASSIGN
4
3
2
1
ASSIGN
ENGAGE
MAIN
MIC LEVEL
OL
ENGAGE
MIC
LINE 5
LINE 6
ACTIVE CROSSFADER
BOOTH LEVEL
LOOP ZONE LEVEL
PROGRAM EQUALIZER
PEAK PROGRAM METER
POWER
HEADPHONE CONTROL
MASTER LEVEL
SOURCE CONTROL
1
MIC CONTROL
MP 24z
10
8
6
10
8
6
4
2
0
4
2
0
2
10
8
6
10
8
6
4
2
0
4
2
0
3
10
8
6
10
8
6
4
2
0
4
2
0
4
10
8
6
10
8
6
4
2
0
4
2
0
MID
BASS
AUX MIC LEVEL
MIN
2
4
8
6
MAX
0
2
4
8
6
10
0
2
4
8
6
10
MIN
2
4
8
6
MAX
LEVEL
CUE PGM
6
2
6
2
0
2
4
8
6
10
MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
MIN
-6
-2
6
2
MAX
CUE LEFT /
PGM RIGHT
MONO
A
B
0246810
0 2 4 86 10
F 60
4 2 161315 18
3
1712
11 10 9 5 6 7 14 19 20 21 22 231
8

Manual-3
Fader Cleaning
With heavy use in harsh environments, the faders may need
lubrication. is treatment extends longevity and can make used
faders as good as new. e fader assembly must be removed from
the MP 24z for proper cleaning. We recommend any of the fol-
lowing cleaning solutions:
Caig DeoxIT FaderLube F100 spray lubricant (www.caig.com)
Caig DeoxIT FaderLube F5 spray cleaner (www.caig.com)
CRC 2-26 (www.crcindustries.com)
Order CaiLube MCL®from:
CAIG Laboratories, Inc.
12200 atcher Ct.
Poway, CA 92064
Phone [phone]
Fax [phone]
www.caig.com
CLEANING INSTRUCTIONS
A. Fader assembly removal
1. Remove (2) 3mm screws.
2. Draw fader assembly out through hole.
3. Remove ribbon cable.
B. Fader cleaning
1. Hold the fader assembly away from the mixer.
2. Position the fader at mid-travel.
3. Spray cleaner/lubricant into both ends of the fader.
4. Move the fader over its full travel back and forth a few times.
5. Shake excess fluid from the fader assembly.
6. Wipe off excess fluid.
eLOOP ENGAGE switch: Controls the Switchable Effects Loop; pressing it to its down and locked position routes the main signal
through the processor attached to the SWITCHABLE LOOP connectors on the rear. (See Rear Panel wand e.)
rMASTER LEVEL fader: Determines the program and mic level at the Main Outputs. Unity gain is approximately “4.5”.
tBOOTH LEVEL control: Adjusts the program and mic level at the Booth Outputs. Unity gain is approximately “6.5”. is Out-
put utilizes a “ducking” circuit, reducing the mic level when the MIC ENGAGE switch is pressed. (See Rear Panel p.)
yZONE LEVEL control: Adjusts the program and mic level of the Zone Outputs. Unity gain is approximately “6.5”.
uPROGRAM EQUALIZER controls: Contour the frequency response of the program at the Main, Booth and Zone Outputs.
is is not designed to be the only equalizer in the system, this is intended to provide EQ between varying program materials.
iPROGRAM EQUALIZER ENGAGE switch: Enables the Program Equalizer to function when pressed in. e Equalizer is
bypassed in the out position.
oHEADPHONE LEVEL CONTROL: Clockwise rotation of this rotary control increases the headphone drive level.
pHEADPHONE PAN CONTROL: Serves two purposes…In the STEREO mode it changes the relative levels of the Cue and
Program mixed together in both earcups. In the MONO mode it changes the balance between the Mono Cue in the left ear cup
and the Mono Program in the right.
aHEADPHONE CUE mode switch: In the up position, this switch feeds STEREO Program and Cue to both earcups, in the
down position the Headphone circuit provides MONO Cue to the left ear and MONO Program to the right.
sHEADPHONE output jack: A tip-ring-sleeve stereo jack provides for the insertion of stereo headphones.
dPEAK PROGRAM METER: provides a visual indication of program output voltage. e calibration of the indication is user
adjustable. (See Rear Panel 6.)

Manual-4
REAR PANEL DESCRIPTION
1BALANCED MAIN OUTPUT connectors: Provide a fully balanced Main Output signal—pin 2 is (+), pin 3 is (–) and pin 1 is
signal ground. Pin 3 must never be grounded for unbalanced operation. Use only pin 2 as hot and pin 1 as return for any unbalanced
operation.
2UNBALANCED MAIN OUTPUT connectors: Provide Main Output signals on ¼" TS (tip-sleeve) unbalanced connections.
3BOOTH OUTPUT connectors: e Left Output only supplies a mono Booth Monitor Output; connecting to both Left and
Right provides a stereo Output.
4ZONE OUTPUT connectors: e Left Output only supplies a mono Zone Output, connecting to both Left and Right provides
a stereo Output. e Zone Outputs are located Post-EQ, which includes the Microphone Output. An internal jumper block pro-
grams the Zone to Pre-EQ (and no mic) if required. (See Service Information on page Manual-9.)
5MAXIMUM OUTPUT GAIN REDUCTION control: Decreases the maximum Level of the balanced and unbalanced MAIN
OUTPUTS of the MP 24z as it is rotated counter-clockwise.
6METER SENSITIVITY ADJUST: Clockwise rotation decreases the full-scale sensitivity of the PEAK PROGRAM METER, as
indicated by the full-scale voltage calibrations around the control.
7SYSTEM MONO/STEREO switch: Engaging this pushbutton converts all Outputs (except tapes and loops) to MONO, regard-
less of the nature of the Input signals.
8EQ RANGE switch: In the out position, the maximum boost/cut available from the Program Equalizer is ±8 dB. In the switch’s
in position, this range is reduced to ±4 dB.
9LIGHT CONTROL OUTPUT jack: Provides a transformer-coupled mono program signal for use by a lighting controller’s trig-
ger input. is is a balanced ¼" output—the tip is positive, the ring is negative and the sleeve is floating.
0LIGHT OUTPUT LEVEL attenuator: Counter-clockwise rotation reduces the Output Level at the LIGHT CONTROL OUT-
PUT jack.
METER SENSITIVITY ADJUST
OFF
5V
TO ALL OUTPUTS. INSTALL IN
UNUSED INPUTS ONLY.
CHASSIS
CLASS 2 EQUIPMENT
GND
SIG GND
LIFT
10V
6V
GAIN REDUCTION
MAX OUTPUT
-22 0
dB
-6
UNBALANCED
POST LOOP
"STORE" PHONO SHORTING PLUGS
IN TAPE OUT JACKS. THIS WILL
SHORT SIGNAL PATH TO GROUND
CAUSING A LOW DISTORTED SIGNAL
DO NOT UNDER ANY CIRCUMSTANCE
UNBALANCED
MONO *
L R
±4dB
PRE LOOP
R
±8dB
L
UNBALANCED
*
PLUGGING ONLY INTO
LEFT YIELDS L+R
OUTPUT. PLUGGING
INTO BOTH YIELDS
MONO OUTPUTS
STEREO OUTPUT.
RETURN RETURN
L R
MONO *
BALANCED
FULLY
SEND
MONO*
SEND
L R
RETURN SEND
L L
WIRELESS
USE FOR
MICS
1.7V
1V
0.6V
2.5V
3.5V
4V
SYSTEMS
LIGHT OUTPUT LEVEL
0 10
2
4
8
6
+15V
DUCKER
BOOTH ACTIVE
DEFEAT
RING=RETURN
TIP=SEND
PHANTOM
POWER
GROUNDING POST
CASE: CHASSIS
3: NEGATIVE
1: COMMON
2: POSITIVE
USING INTERNAL RIAA DEFEAT JUMPERS
RANE CORP.
MADE IN U.S.A.
N108
BALANCED
UNBALANCED
AND PIN 1 FOR
USE ONLY PIN 2
PIN 3 TO GND!
DO NOT SHORT
CASE: CHASSIS
3: NEGATIVE
2: POSITIVE
1: COMMON
OUTPUT
RETURN SEND
R R
LINE 6
R
LINE 5
L
LIGHT CONTROL OUTPUT
TRANSFORMER COUPLED
MONO
LINE 4
R
AUX 3
L
PH 2
R
LINE 3
L
R
L
PH 3 AUX 2
MIC
LINE 2
L R
LINE 1 PH 1
AUX 1
SWITCHABLE LOOPTAPE OUTEQ
RANGE
ZONE OUTPUT
MONO
MAIN OUTPUTS
OUTPUT
BOOTH
MAIN EFFECTS LOOPSYSTEM
(HI-Z ONLY)
LOOP
MIC
AUX
MIC
MAIN
MIC
R
L
R
CAUTION L
R
LMP 24z
POWER
750mA
8
28 2627 53 6 10 20
11 74 15 14 13 12
24
23
21
1 2 9 25 18 19 17 16

Manual-5
qTAPE OUT jacks: One pair of RCA jacks provides pre-EQ, pre-LOOP Program Outputs. e other pair supplies pre-EQ, post-
LOOP Program Outputs. e microphone signals are not available at these Outputs, however they are selectable using an internal
jumper block. (See Service Information on page Manual-9.)
wSWITCHABLE LOOP SEND jacks: Use these ¼" unbalanced Left and Right Outputs for driving the inputs of a processor
activated by the LOOP button (front panel e).
eSWITCHABLE LOOP RETURN jacks: Use these ¼" unbalanced Inputs for receiving the outputs of the above processor.
rMAIN EFFECTS LOOP SEND jacks: Provide drive to the inputs of a signal processor which is not to be switched from the front
of the mixer. Connecting only to the LEFT Effects Send provides a mono Output; connecting to both LEFT and RIGHT pro-
vides a stereo feed. ese are ¼" TS (Tip-Sleeve) unbalanced connections.
tMAIN EFFECTS LOOP RETURN jacks: Receiving the processed signal generated from the Main Effects Loop SENDs. ese
are ¼" TS unbalanced connections.
yBalanced MAIN MIC Input jack: Connects a balanced microphone of any impedance, either dynamic or condenser.
uUnbalanced high-impedance AUX MIC Input jack: Connects an unbalanced wireless or other high-impedance mic.
iMIC LOOP jack: Inserts external signal processing in the microphone circuit only. is is a ¼" TRS tip-send, ring-return con-
figuration. is feature does not affect the operation of the Main Program channels.
oPHANTOM POWER switch: Engaging this pushbutton applies +15 V Phantom Power to the balanced (XLR) MAIN MIC
Input only. It has no effect on the Aux Mic Input. e adjacent red LED illuminates whenever Phantom Power is active.
pBOOTH DUCKER switch: When in the ACTIVE position, the ENGAGE MIC switch (front panel 9) reduces the Micro-
phone level at the Booth Outputs. When in the DEFEAT position, Microphone level is not reduced.
aAUX/PHONO input jacks: Use these stereo Phono Input pairs for connecting any moving-magnet type cartridges to the mixer.
Internal jumpers are provided to convert these into Line level Inputs (See Service Information on page Manual-9). AUX/PH 1 and
AUX/PH 2 jumpers are set at the factory for PHONO. e PH/AUX 3 jumper is set at the factory for a LINE level input. When
these jumpers are set to PHONO, never use these Inputs for any other purpose due to the amount of gain and RIAA equalization
present. Any unused Phono Input should have the Phono Shorting Plug installed to prevent interference from an outside source. Do not
put any of the Phono Shorting Plugs into the Tape Out jacks, as this will short all the Outputs.
sPHONO/AUX 3 input jacks: As in aabove. Note this Input is shipped with the internal jumpers in the LINE position.
dLINE 1 & 3 through 6 Input jacks: Are suitable for all line-level devices such as the audio outputs of DVD players, CD players,
iPods, radio tuners, drum boxes, keyboards, etc. ese RCA connectors pairs are unbalanced, line-level Inputs only.
fLINE 2 Input jacks: Are a fully balanced, ¼" TRS (Tip-Ring-Sleeve) line Input. e tip of the jack is (+), the ring is (–) and the
sleeve is ground.
gGROUNDING POST terminal: Provided to facilitate your hum chasing, buzz eliminating experiments. Its purpose is to provide
a place to connect those extra wires coming out of the turntables.
hChassis ground point: Since the MP 24z does not get chassis ground through the AC cord, this point is provided in case your
system does not have another earth ground such as the rack rails. A #6-32 screw and toothed washer is provided for chassis
ground. See Chassis Grounding on page Manual-8 for details.
jGROUND LIFT SWITCH. Separates chassis ground from signal ground. Normally, this switch should be in the LIFT position.
In some circumstances, moving it to the opposite position eliminates stubborn hum and buzz problems. If you are tempted to
move this switch with your power amplifiers turned on and cranked up, don’t. Always turn your system levels down before changing
your grounds around and then bring them up slowly.
kPOWER input connector: No, this is not where Commissioner Gordon plugs in his Bat-phone, in fact it is not a telephone jack at
all. e MP 24z uses an 18 volt AC center-tapped transformer. Use only a model RS 1 remote AC power supply approved by Rane.

Manual-6
e front panel switchable LOOP is for stereo devices only,
so consider which effects are connected where. Some proces-
sors, such as delays and reverbs, have only one mono input and
two outputs. is is accommodated automatically by using the
MONO Output of the MAIN EFFECTS LOOP.
e Zone Outputs and the Booth Outputs are the auto-
matic mono/stereo type. If mono is required, simply connect
only to the LEFT OUTPUT. Inserting a plug into the RIGHT
OUTPUT automatically renders it stereo. All of these Output
connectors are unbalanced. Attempting to run TRS balanced on
any of these results in an open leg on the receiving component and
causes problems.
is is a good place to discuss the problems encountered in
connecting the MP 24z to all of the different types of cables and
connectors that one finds when basing a system on consumer
goods (the pieces of equipment with the RCA connectors),
commercial audio products (¼", XLR etc.), and no telling what
else. In consumer audio devices, one rarely finds ground-lift
capabilities, or any of the other hum prevention devices normally
provided on commercial equipment. Chassis ground and signal
ground are normally the same thing, a situation which may cause
problems when the two species get on the same bus.
e best we can do to try to help you eliminate hum, oscil-
lations, or other stray characters from your system is to tell you
to experiment. If you think lifting the ground on the MP 24z,
crossovers, equalizers or power amplifiers might help, go ahead
and try it. ere is science involved in de-humming a system,
however it is sometimes faster to just experiment. Occasion-
ally, directly grounding the chassis of the mixer to the power
amplifiers with a large gauge wire helps. And by the same token,
isolating the two when they are installed in the same rack may
have a quieting effect. A word of caution: Don’t do anything with
Level controls up, power on, or under any condition that could cause
damage to delicate loudspeakers and ears. Make your changes with
the system off, then power up carefully to make sure you haven’t
made matters worse. Bring up Level controls slowly and with
great caution. Surprises are nice on birthdays and Christmas,
and rarely any other time.
If hum problems only exist on the Phono Inputs, there is
always a possibility for experimental troubleshooting at this end
also. Experience has shown that just because the manufacturers
put ground wires on them, they are not always connected! Some
turntables even have two ground wires, one for the tone arm and
one for the chassis. Sometimes only one of these should be con-
nected for optimum signal-to-noise, sometimes both, sometimes
none. e rule is: “Whatever works, works.”
MP 24z CONNECTION
Even though the system variations are limitless in most ap-
plications where the MP 24z is used, an installer must follow
some basic interconnect guidelines. Unfortunately, even though
the system and the primary components such as mixers, proces-
sors and amplifiers are of commercial grade, most of the source
components, i.e. turntables, disc players, tape decks and so on
are consumer grade, with consumer interconnect limitations.
erefore, on the input side of the MP 24z, RCA connectors
will prevail with unbalanced lines thereto attached. It is recom-
mended, for no scientific reason, that the turntable furthest to
the left be connected to Phono 1, and proceed from left to right
with Phono 2 and then Phono 3, if used. See Service Information
on page Manual-9 to convert any PHONO level Input into a
LINE level Input.
When determining which Line Inputs to use for what, the
process becomes a bit more difficult. Obviously, if one of the line
devices feeding the MP 24z is of the commercial variety sport-
ing balanced outputs, use Line 2 for this due to its unique ability
to accept such foreign substances. e rest of the assignments
are pretty much a matter of what you want to appear where on
the source switches. As you can see, Lines 1 through 3 appear
only on Input Channels 1 and 2; Lines 4 through 6 appear only
on Input Channels 3 and 4. So the layout will depend on how
heavily you will use the Phono Inputs and how many line level
devices you will be using.
On the Output side, things are a bit less restrictive. On the
MAIN OUTPUTS you have been given a choice between XLR
balanced and ¼" unbalanced. Which you use should be derived
from some consideration of how far the cable has to run from
the mixer to the next component, how much ambient noise there
is in the local atmosphere (Radio Moscow in the next building,
36,000 SCR controlled light dimmers in the next rack), and any
other possible encumbrance on the quality of the audio inside
the jacket. Most experienced installers and users of commercial
sound equipment have a good handle on which to use in a given
situation. e general rule is: if the Output from the MP 24z is
running longer than 10 feet (3 meters), use balanced cables. If
the input to your system equalizer, crossover, or power amplifier
is balanced, go balanced. If you keep the cable length short and
your destination has unbalanced inputs, you can probably get
away with using the ¼" unbalanced connectors.
e TAPE OUTPUTS are unbalanced RCA connectors;
the assumption being that most readily available tape recording
equipment such as would be used in a club situation would be
of similar type. Simply determine whether you want the signal
processing in the Effects Loops to have an effect on the recording
being made and connect the record inputs (left and right) to the
appropriate PRE-LOOP or POST-LOOP TAPE OUTPUTS.
ese Tape Outputs do not contain any signal from the Micro-
phone section. If you need to record the Mic, use the Unbalanced
Main Outputs, Zone Output, or the Booth Output with the
Booth Ducker circuit defeated. (If none of these are available, see
Service Information on page Manual-9 for internal jumper chang-
ing instructions.)

Manual-7
OPERATING INSTRUCTIONS
INITIAL OPERATION
Operation of the MP 24z is fairly straightforward, deviating
only slightly from other products of its type. Assuming at least
one turntable is connected and assigned to PHONO 1, opera-
tion consists of the following: Make sure all faders are set to zero,
the MIC, LOOP, EQ, and ACTIVE CROSSFADER are all
disengaged, (switches out) and that all rotary LEVEL controls are
either fully counter-clockwise or in their center detents, which-
ever applies. Select PHONO l on Input Channel 1. Simultane-
ously raise the Channel 1 fader and the MASTER LEVEL fader.
Before much travel is reached on the faders, the results should
be heard. If not, shut everything down and recheck connections,
power to the mixer (look for the yellow POWER light) and
ancillary devices (EQs, crossovers, amplifiers, etc.)
Once an output is established from the turntable, go ahead
and try everything else. Assign all Inputs to the Channels they
will be used, and test the system. Once all sources are set as
desired, proceed.
REAR PANEL ADJUSTMENTS
ere are some controls on the rear panel which need to be
set. Set the METER SENSITIVITY ADJUST so the system
is at maximum level, (usually just short of amplifier clipping).
Run the system up to this maximum level and turn the METER
SENSITIVITY ADJUST so that the highest peaks on the PEAK
PROGRAM METER occasionally hit the +8 dB indicator. is
warns the operator that further pressure on the throttle will
overdrive the system.
At this point check the MAXIMUM OUTPUT GAIN RE-
DUCTION control so that with the MASTER LEVEL at “10”,
the meter responds as it did in the previous step. is would be
a good time to make the adjustment. is may be accomplished
by turning the rear panel MAX OUTPUT GAIN REDUC-
TION adjustment all the way down, pushing the MASTER
LEVEL fader all the way up, setting a normal mix level on the
Input fader, and then turning up the MAX OUTPUT GAIN
REDUCTION adjustment on the rear until the required output
level is attained. In some cases, make this adjustment with both
the Source Level and the MASTER LEVEL faders all the way
up. is is acceptable only if sources can be adjusted such that
they all have equal output before they reach the Input of the
MP 24z. If this is not possible, full system drive will not come
from some components. To accomplish this feat, use identical
cartridges in all turntables so the phono levels are all the same.
Having done all of this it is possible to use the MAX OUTPUT
GAIN REDUCTION on all of your sources.
e other rear panel adjustment that should be made at this
time has to do with the maximum deviation to the frequency re-
sponse of the system left to the operator. is is controlled by the
EQ RANGE switch. In the out position, the range of all of the
EQ controls is ±8 dB. In the in position, this range is reduced
to ±4 dB. e latter is considered safer in situations where taste
makes waste—in drivers, that is.
THE HEADPHONE CONTROL (CUE) SYSTEM
To use the HEADPHONE CUE System, signal must be
present at one of the Inputs. (Well, at least you do to make sure
it works.) Depressing the CUE switch for the respective Input
channel presents this signal to the Headphone Cue amplifier.
An LED illuminates next to the CUE switch, attesting to the
fact that it was indeed pushed down. Now select how to listen to
it — Mono Cue in one ear, Mono Program in the other, Stereo
Program in both ears, or Stereo Cue in both ears. e STEREO/
MONO CUE switch allows this flexibility. To vary the level
between Cue and Program, rotate the HEADPHONE PAN
control in the desired direction. Counter-clockwise rotation in-
creases the Cue Level, clockwise rotation increases the Program
Level. e overall volume of all of this is then controlled by the
rotary HEADPHONE LEVEL control.
USING THE ASSIGNABLE ACTIVE CROSSFADER
Active Crossfader™ technology combines state of the art volt-
age controlled amplifier design with a professional quality cross-
fader control. is combination sets new standards for perfor-
mance, reliability and serviceability. Virtually all crossfader noise
is eliminated. Channel to channel crosstalk is greatly reduced
and the off isolation of the faded channel is greatly increased. Ac-
tive Crossfader technology dramatically increases the service life
of the crossfader. In the unlikely event of crossfader failure, there
is no loss of signal. If a crossfader becomes rough or noisy, it may
be “hot-swapped” during a performance with no interruption
of the audio signal. Simply use the input faders to set the audio
levels while the crossfader is out of service.
For normal operation, press the Crossfade ENGAGE switch.
e green LED next to the switch illuminates. e Crossfade
ASSIGN switches determine the two Input channels to be mixed
by the Crossfader. As an example, assume the left ASSIGN
switch is set on 1 and the right ASSIGN switch is on 2. is
activates both mix faders on Channels 1 and 2. eir outputs,
however, are under the control of the Crossfader. When in its
left-most position, only Channel 1 appears at the Outputs. Both
Channels are present in equal levels in the when the Crossfader is
brought to the middle, and only Channel 2 is heard once the far
right is reached.
e contour of the Crossfade has been optimized for con-
temporary use. However, the mix of the two input signals will
have an impact on volume level as you fade from one input to the
other.
Once crossfaded to Channel 2, maybe cue up some video and
put the audio on Channel 4. Hard to do? No way. Simply pull
the Channel 1 fader to zero, set the ASSIGN switch on the left
of the Crossfader to Channel 4, Cue up 4, set the level on fader 4
and Crossfade into it. We realize that it’s a bit strange to Cross-
fade from 2 to 4 by sliding the fader to the left, however it’s just
an unavoidable oddity caused by having so much flexibility.

Manual-8
MICROPHONE OPERATION
To use the mic, connect it to the appropriate connector, and
set the PHANTOM POWER switch to the desired mode (it’s
a good idea to have the Phantom Power in the on position for
condenser mics, off for dynamics). Leave the MASTER LEVEL
fader in roughly the same location as it was for the music that’s
been playing, press the MIC ENGAGE switch and slowly adjust
the MAIN MIC (or AUX MIC) LEVEL. Once this has been
accomplished, the tonal balance may be adjusted via the MIC
EQ controls located above the LEVEL controls. Modifying the
sound of the mic in this way won't affect the EQ of the music in
the system. e two Equalizer sections (Mic and Program) are
totally independent. When the microphone is not in use, release
the MIC ENGAGE switch again to its upward position. When
the switch is down, the red LED flashes. When off, the LED will
be out. If the microphone preamp becomes overloaded, the red
LED Overload light illuminates. If this is a problem, lower the
appropriate MIC LEVEL control and increase the level of the
MASTER LEVEL fader to restore desired microphone level.
MONO OPERATION
ere may be situations where a mono output signal is
preferable to a stereo output. If this is the case, mono outputs
may be obtained on all of the Outputs (Master, Booth, Zone) by
engaging the SYSTEM MONO switch on the rear panel. When
engaged, the SYSTEM MONO switch sums the Left and Right
buses together. In this situation, if only one of the stereo Inputs
on any of the three Phono or six Line sections is driven, the ap-
plied signal appears in equal quantities at both Left and Right
OUTPUT connectors.
USING THE LIGHTING CONTROL OUTPUT
e mono LIGHT CONTROL OUTPUT allows use of
lighting systems designed to be triggered from an audio source.
A LIGHT OUTPUT LEVEL control adjusts the output level
appropriate for the lighting controller. ere appears to be a wide
variety of sensitivities in different brands of controllers, therefore
some adjustment is likely required. In the full CW position of
the LIGHT OUTPUT LEVEL control, the signal delivered
is amplified 20 dB relative to the pre-master fader level. If this
is excessive, CCW rotation of the LIGHT OUTPUT LEVEL
control decreases the drive amount. None of the LEVEL controls
past the Input Channel faders affect this drive level.
BOOTH AND ZONE OUTPUTS
e ZONE OUTPUT is an additional Stereo Output with
it’s own ZONE LEVEL control that can be routed to an am-
plifer that feeds the bar, another tape recorder, etc. is output
is Post-EQ, which means also that the mic is heard from the
Zone Outputs along with any Program EQ changes (is can be
changed with an internal jumper block). e BOOTH OUT-
PUT operates much the same way, with an added feature: When
the ENGAGE MIC switch is activated, the gain of the BOOTH
OUTPUT “ducks” down 13.5 dB to prevent feedback from the
booth speakers. If this Output is used for something else and this
feature is undesired, a BOOTH DUCKER DEFEAT switch is
provided on the rear panel. Be sure this switch is in the ACTIVE
position if booth speakers are used.
SOME FURTHER HINTS
Set the Input Channel faders near their maximum levels to
preclude required excessive gain from the Output stage. Opti-
mum noise performance is achieved by running the majority of
the gain on the Input stages. Taking the least amount of gain on
the Output stage ensures that the system doesn’t have to amplify
the unavoidable noise generated by the input buffers and sum-
ming amplifiers.
IMPORTANT NOTE
CHASSIS GROUNDING
e MP 24z is supplied with a rear mounted ground-lift
switch. e unit is shipped with this switch in the “grounded”
position, tying circuit ground to chassis ground. If after hooking
up your system it exhibits excessive hum or buzzing, there is an
incompatibility in the grounding configuration between units
somewhere. Here are some things to try:
1. Try combinations of lifting grounds on units that are supplied
with ground lift switches or links.
2. If your equipment is in a rack, verify that all chassis are tied to
a good earth ground, either through the line cord grounding
pin or the rack screws to another grounded chassis.
3. is units outboard power supply does not ground the chassis
through the line cord. Make sure that this unit is grounded
either to another chassis which is earth grounded, or directly
to the grounding screw on an AC outlet cover by means of a
wire connected to a screw on the chassis with a star washer to
guarantee proper contact.
Please refer to RaneNote “Sound System Interconnection”
(supplied with this manual and available at www.rane.com) for
further information on system grounding.

Manual-9
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL [phone] FAX [phone] WEB www.rane.com
MP 24z SERVICE INFORMATION
CHANGING INTERNAL JUMPER BLOCKS
ere are several programmable options built into the MP
24z. All are located on the Main Board which is the top-most
PCB. Access is gained by removing the seven (7) screws from
the top cover. See the main board assembly diagram later in this
manual. Dots on the circuit board indicate jumper positions
as shipped from the factory. To change: pull the jumper block
straight up, move over one pin and push back down. at's all
there is to it.
FUNCTION DEFAULT OPTION JUMPERS NOTES
Phono 1 Phono 1 Aux 1 J27, J28 a
Phono 2 Phono 2 Aux 2 J21, J22 a
Phono 3 Aux 3 Phono 3 J23, J24 b
Tape Output No Mic to Tape Mic to Tape J25, J26 c
Zone Output Post EQ w/ Mic Pre-EQ w/out Mic J18, J19 d,e
NOTES a.Phono Input becomes Aux Input
b. Aux Input becomes Phono Input
c. DJ Mic signals will record on tape
d. DJ Mic signals will not play on Zone Output
e. Equalizer will not affect Zone Output
PHONO/LINE JUMPERS
AUX/PH 1 and AUX/PH 2 jumpers are set at the factory
for PHONO. Move each respective pair of jumpers to LINE
to convert each of these into line level inputs. e PH/AUX 3
jumpers are set at the factory for a LINE level input. Move this
pair of jumpers to PHONO to change these into phono RIAA
level inputs.
Phono 1 jumpers J27 and J28 are located behind the
PHONO 1 and LINE 1 jacks. Phono 2 jumpers J21 and J22 are
located behind the PHONO 2 and PHONO 3 jacks. Phono 3
jumpers J23 and J24 are located behind the LINE 4 and LINE 5
jacks.
TAPE OUTPUT JUMPERS
e Tape Outputs are shipped from the factory to not in-
clude any Mic signal. Moving jumpers J25 and J26 to MIC add
Mic signal to the Tape Output. ese jumpers are behind the
S12 SYSTEM MONO switch on the main circuit board.
ZONE OUTPUT JUMPERS
e Zone Outputs are shipped from the factory to include
the output of the Program Equalizer and the Mic signals. Mov-
ing jumpers J18 and J19 to BYPASS changes the Zone Output to
pre-EQ, with no mic signals. Locate J18 and J19 behind the R81
BASS pot on the main circuit board.
REPLACING THE ACTIVE CROSSFADER
e Crossfader may be removed from the front of the
MP 24z without any disassembly of the unit itself, and may be
performed while the unit is operating with no interruption of the
audio signal.
F 60 and F 45 Fader Kits are available from your local retailer
or the factory. e full assembly kit includes knobs, ribbon, and
face plate.
1. Remove the two (2) outer screws attaching the crossfader as-
sembly to the front panel.
2. Pull the Crossfader Assembly forward and unplug the ribbon
from the connector on the bottom board.
3. Install the replacement assembly by reversing the above in-
structions.
See Fader Cleaning instructions on page Manual-3.
MP 24z ASSEMBLY
Later in this manual lie a rather large selection of drawings
to help with any service problems that may arise on the MP 24z.
Included are full schematic diagrams, a block diagram, com-
ponent placement drawings for all of the printed circuit boards
and a diagram of the overall placement of the PCBs and their
interconnects. All of the information you will need is found in
these drawings. Begin with a study of the Schematic Guide found
on page Schematic-5.
Tracing signal through the MP 24z is easy if you refer to the
schematic and pay close attention to the connector and pin in-
formation. e signal appears at pins on the top PCB as it travels
through the unit. You may use these as well as the pins on the
ICs to make your troubleshooting safari easier.
It may be necessary to remove the chassis to access internal
components. To make it possible to reconstruct the unit once
you are finished fixing it, please follow these simple directions:
1. Remove the three (3) philips-head screws on each side of the
front panel.
2. Remove the fourteen (14) nuts from the various ¼" connectors
on the rear panel.
3. Remove the five (5) philips-head screws holding the RCA
connector assemblies and the one securing the bracket in
the center area of the rear panel (near LIGHT OUTPUT
LEVEL).
4. Remove the three (3) knobs from the rotary controls protrud-
ing through the rear.
5. Carefully lift off the chassis, spreading it slightly so it clears
the obstructions created by the circuit boards.
If resistance is encountered, re-check for missed screws or
sticking 3-pin connectors before you take a tire iron to it. You
(and we) will be glad you did. Having successfully removed the
chassis, the PCB assemblies will be far easier to service. If it is
required to get to some of the parts on the individual Channel
PCBs, the only way to extract these is to either remove the top or
the bottom PCBs. You must first remove the screws adjacent to
each connector or they will not budge. Once all of the connector
screws are removed from the top or bottom PCB, you should be
able to remove the board.
All integrated circuits are in sockets since active components
statistically have a shorter life expectancy than their passive
cousins. Most of the ICs may be removed and replaced without
separating any of the PCBs. All it takes is a little patience and
a pair of long nose pliers with a curve at the tip. Hang in there,
you’ll get it.
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