AUX RET
LEFT/MONO
RIGHT
AUX SEND
MIC IN
MIC IN
L
CR OUTPUT
R
PHONES
LINE IN
LINE IN
L
3/L
5/L
30
30
GAIN
GAIN
LINE IN
LINE IN
MIX OUTPUT
6/R
R
4/R
5
60
5
60
+26
-26
+26
-26
0
0
0
0
0
0
0
0
2T IN
2T OUT
HF
HF
HF
HF
5
5
5
5
5
5
5
5
12K
12K
12K
12K
10
10
10
10
10
10
10
15
10
LEFT
LEFT
15
15
5
15
15
5
15
5
15
5
15
5
0
0
MF
MF
MF
MF
2.5K
5
5
5
RIGHT
RIGHT
2.5K
2.5K
2.5K
10
10
10
10
10
10
10
15
10
15
5
15
15
5
15
15
5
15
15
AUX RETURN
5
0
0
LF
LF
LF
LF
5
5
5
5
5
80Hz
80Hz
80Hz
80Hz
PHANTOM
POWER
10
10
10
10
10
10
10
15
10
15
15
15
15
15
15
15
0
10
CLIP
+12
AUX
AUX
AUX
AUX
2TK TO MIX
2TK TO C/R
+6
0
-6
0
10
0
10
0
10
0
10
-12
-18
0
0
0
0
PAN
PAN
BAL
BAL
-24
L
R
OUTPUT LEVEL
L
R
L
R
L
R
L
R
5
5
5
5
5
5
PEAK
PEAK
PEAK
PEAK
0
10
1
0
10
2
0
10
0
10
0
10
0
10
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
CHANNEL
CHANNEL
CHANNEL 3/4
CHANNEL 5/6
CR
/
PHONES
MAIN LEVEL
SIX CHANNEL MIXER
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Table of Contents
Introduction
2
3
MDR624 Features
Controls and Functions
Front and Rear Panel Layout
Mono Input Channel Section
Master Section
4–5
6–7
8–9
MDR624 Input and Output Connections
Operating the MDR624
System Set-ups
10–11
12–13
14–15
16
MDR624 Wiring Guide
Specifications
17
Block Diagram
18
Notes
18-19
Copyright 2004, Samson Technologies Corp.
Printed January, 2004
Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
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Introduction
Congratulations on your purchase of the Samson MDR624 mixer! The MDR624 is a six channel mixer, with two
low noise microphone pre-amps. In addition to the two mono Mic/line inputs, there are two channels with left and
right inputs to handle stereo signals. For added flexibility, you can change the tone quality of your microphones or
other line inputs by using the three-band channel equalizers. Connecting external effects like a reverb or digital
delay to the MDR624 is easy thanks to the Aux send on each channel along with the stereo Aux Return in the
master section. LED indicators for Power, Phantom, Peak and Main Output Level make it easy to keep your lev-
els set correctly and minimize distortion. Clean, clear sound reproduction, packaged in a rugged enclosure,
ensure reliable high quality sound from performance to performance. Optimized for recording, live sound rein-
forcement and commercial installations, the MDR624 is an ideal mixer solution offering big sound in a compact
package.
In these pages, you’ll find a detailed description of the features of the MDR624 mixer, as well as a description of
its front and rear panels, step-by-step instructions for its setup and use, and full specifications. You’ll also find a
warranty card enclosed—please don’t forget to fill it out and mail it in so that you can receive online technical sup-
port and so we can send you updated information about these and other Samson products in the future.
With proper care and adequate air circulation, your MDR624 will operate trouble free for many years. We recom-
mend you record your serial number in the space provided below for future reference.
Serial number:
Date of purchase:
Should your unit ever require servicing, a Return Authorization number (RA) must be obtained before shipping
your unit to Samson. Without this number, the unit will not be accepted. Please call Samson at 1-800-3SAMSON
(1-800-372-6766) for a Return Authorization number prior to shipping your unit. Please retain the original packing
materials and if possible, return the unit in the original carton and packing materials.
2
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MDR624 Features
AUX RET
LEFT/MONO
RIGHT
AUX SEND
MIC IN
MIC IN
L
CR OUTPUT
R
PHONES
LINE IN
LINE IN
L
3/L
5/L
30
30
GAIN
GAIN
LINE IN
LINE IN
MIX OUTPUT
6/R
R
4/R
5
60
5
60
+26
-26
+26
-26
0
0
0
0
0
0
0
0
2T IN
2T OUT
HF
HF
HF
HF
5
5
5
5
5
5
5
5
12K
12K
12K
12K
10
10
10
10
10
10
10
15
10
LEFT
LEFT
15
15
5
15
15
5
15
5
15
5
15
5
0
0
MF
MF
MF
MF
2.5K
5
5
5
RIGHT
RIGHT
2.5K
2.5K
2.5K
10
10
10
10
10
10
10
15
10
15
5
15
15
5
15
15
5
15
15
AUX RETURN
5
0
0
LF
LF
LF
LF
5
5
5
5
5
80Hz
80Hz
80Hz
80Hz
PHANTOM
POWER
10
10
10
10
10
10
10
15
10
15
15
15
15
15
15
15
0
10
CLIP
+12
AUX
AUX
AUX
AUX
2TK TO MIX
2TK TO C/R
+6
0
-6
0
10
0
10
0
10
0
10
-12
-18
0
0
0
0
PAN
PAN
BAL
BAL
-24
L
R
OUTPUT LEVEL
L
R
L
R
L
R
L
R
5
5
5
5
5
5
PEAK
PEAK
PEAK
PEAK
0
10
1
0
10
2
0
10
0
10
0
10
0
10
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
CHANNEL
CHANNEL
CHANNEL 3/4
CHANNEL 5/6
CR
/
PHONES
MAIN LEVEL
The Samson MDR624 six channel mixer, is a comprehensive, all-in-one solution for live sound, recording, fixed
installation and post production applications. Here are some of its main features:
•
•
•
Six channels – Two Mic/Line plus two Stereo inputs.
Flexible design topology ideal for live sound, recording and post production.
2 Track To Mix Level control allows you to mix in a CD, DAT, Cassette, Computer Sound Card or Mini
Disk with the channel faders.
•
Three-band channel equalizer, +/-15dB at 80Hz, 2.5 KHz and 12KHz provides precise and musical
results in sound shaping.
•
•
•
An Auxiliary Send for external effects, on stage monitor mix, or headphone mixing.
Eight segment LED Meter with VU ballistics displays the main MIX output.
High quality, low noise, discrete microphone pre-amplifiers with 48-Volt phantom power, provide
Maximum Dynamic Range and transparent audio.
•
•
•
Advanced circuit design using discrete components and high quality, low noise op-amps carefully select-
ed at each stage of the signal path.
Quality build and rugged construction ensure reliable performance from venue to venue and session to
session.
Three-year extended warranty.
3
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Controls and Functions
Front and Rear Panel Layout
11
12
1
13
14
15
16
17
AUX RET
LEFT/MONO
RIGHT
AUX SEND
MIC IN
MIC IN
2
3
L
CR OUTPUT
R
PHONES
18
19
LINE IN
LINE IN
L
3/L
5/L
30
30
GAIN
GAIN
LINE IN
LINE IN
MIX OUTPUT
6/R
R
4/R
5
60
5
60
+26
4
-26
+26
-26
20
0
0
0
0
0
0
0
0
2T IN
2T OUT
HF
HF
HF
HF
5
5
5
5
5
5
5
5
12K
12K
12K
12K
5
6
21
22
10
10
10
10
10
10
10
10
LEFT
LEFT
15
5
15
5
15
15
5
15
5
15
5
15
5
15
5
0
0
MF
MF
MF
MF
2.5K
5
RIGHT
RIGHT
2.5K
2.5K
2.5K
10
10
10
10
10
10
10
10
23
15
5
15
15
5
15
15
5
15
15
5
15
AUX RETURN
5
0
0
LF
LF
LF
LF
5
5
5
5
80Hz
80Hz
80Hz
80Hz
PHANTOM
POWER
7
8
10
10
10
10
10
10
10
10
15
15
15
15
15
15
15
15
0
10
CLIP
+12
AUX
AUX
AUX
AUX
2TK TO MIX
2TK TO C/R
+6
0
-6
0
10
0
10
0
10
0
10
-12
-18
9
0
0
0
0
PAN
PAN
BAL
BAL
-24
L
R
OUTPUT LEVEL
10
L
R
L
R
L
R
L
R
5
5
5
5
5
5
PEAK
PEAK
PEAK
PEAK
0
10
0
10
0
10
0
10
0
10
0
10
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
24
25
CHANNEL 1
CHANNEL 2
CHANNEL 3/4
CHANNEL 5/6
CR / PHONES
MAIN LEVEL
28
27
26
A
B
PHANTOM
DESIGNED AND ENGINEERED IN THE UNITED STATES BY SAMSON TECHNOLOGIES
ON
OFF
CAUTION
ON
OFF
CAUTION:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT REMOVE BOTTOM COVER
RISK OF ELECTRICAL SHOCK
NON SERVICEABLE PARTS INSIDE
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
REFER SERVICING TO QUALIFIED PERSONNEL
DO NOT OPEN
RISQUE DE SHOCK ELECTRIQUE
NE PAS OUVRIR
POWER
SERIAL NUMBER :
MADE IN CHINA
AC ADAPTOR
C
4
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Front and Rear Panel Layout
Front and Rear Panel Layout
FRONT PANEL
18 2 TRACK INPUTS – Connect the output from a DAT,
1
MIC – Input connector for Low-Noise Microphone pre-
Cassette, Mini Disk or Hard Disk Recording system.
amp.
19 2 TRACK OUTPUTS – Connect to the input of a DAT,
2
3
LINE –Input connector for Line level inputs.
Cassette, Mini Disk or Hard Disk Recording system.
GAIN – Used to set the input level of the mic pre and line
20 AUX RETURN – Used to mix in level of the effects
input.
return.
4
5
6
7
8
9
HIGH FREQUENCY – Controls the high band of the
Channel Equalizer, +/- 15 dB at 12KHz.
21 PHANTOM – Indicates that the 48 Volt Phantom
Power is on.
MID FREQUENCY – Controls the mid band of the Channel
Equalizer, +/- 15 dB at 2.5KHz.
22 POWER – Indicates the MDR624 is powered up.
23 OUTPUT METER - Eight segment display with VU
LOW FREQUENCY – Controls the low band of the Channel
Equalizer, +/- 15 dB at 80Hz.
ballistics indicates main Mix level.
24 2 TRACK TO MIX - Switch used to mix the 2 track
AUX – Pre fader auxiliary send that can be used with an
external effects processor, or to create a cue or monitor
mix.
PAN – Controls the channel’s position between left and
right in the stereo bus.
input with the mix from the channel inputs.
25 2 TRACK TO CR – Switches between the main Mix
and the 2 Track in the Control Room output.
26 MAIN LEVEL – Used to control the overall volume of
PEAK – Red LED will illuminate indicating when the
the Left and Right main Mix outputs.
GAIN has been adjusted too high.
27 C ROOM/HEADPHONE – Adjusts the volume of the
10 LEVEL – Audio taper fader provides smooth control over
control room speakers or headphones.
level changes.
28 BALANCE – Controls the channel’s position between
11 RIGHT LINE – 1/4-inch phone input connector for the right
left and right in the stereo inputs.
line input for the stereo channels.
12 LEFT LINE - 1/4-inch phone input connector for the Left
Line input for the stereo channels.
REAR PANEL
13 AUX RET – Input connector from external line level
sources.
A
B
POWER – Switches on the MDR624’s main power.
14 AUX SEND – Line level output from the Auxiliary bus.
PHANTOM – Engages the 48-Volt Phantom power
supply to microphone pre-amps.
15 HEADPHONE JACK – Connect stereo headphones here.
C
AC ADAPTOR INLET – Connect External AC power
supply here.
16 CR OUTPUT– Left and Right Control Room output connec-
tors for connecting a monitor system.
17 MIX OUTPUT – Left and Right main Mix output connec-
tors.
5
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Controls and Functions
MONO INPUT CHANNEL SECTION
The following section details each part of the MDR624’s input channels including the GAIN control, 3-BAND EQ,
AUX send, PAN, BALANCE and LEVEL controls. The input channels One and Two on the MDR624 feature high
quality, discrete transistor pre-amps providing transparency and extended dynamic range on standard XLR con-
nectors. Channels 3/4 and 5/6 are stereo input channels that accept line level signals on standard 1/4" phone
connectors for either balanced (TRS – TIP/ RING/SLEEVE) or unbalanced (TS – TIP/SLEEVE) connections. A
detailed explanation of the Input, as well as the Output connectors, can be found in the following section “Input and Output
Connections” on page 11 of this manual.
GAIN
1
The MDR624’s pre-amp stage has a variable GAIN control, which is used to set the sensitivity of the
input. Because the input can accept either a mic or line level signal, the GAIN control operates in two
ranges based on which input is being used. When a microphone is connected to the input, the range is
5 to 60dB, and when a line is connected, the range is –26 to +26dB. For more infor-
30
mation on using the GAIN control see the section “CONNECTING MICROPHONES AND INSTRU-
GAIN
G
MENTS” on page 12 of this manual.
1
5
60
-26
+26
CHANNEL EQUALIZER
2
The MDR624 input channels feature a 3-band equalizer allowing you to adjust the
high, mid, and low frequencies independently on each channel. The channel’s fre-
quency response is flat when the knobs are in the "12:00" position. Rotating the
knob towards the right will boost the corresponding frequency band by up to 15dB,
and rotating it towards the left will cut the frequency by up to 15dB. The frequency
centers, range of boost or cut, and equalizer type for each band are as follows:
High: 12KHz +/- 15dB shelving type
0
0
0
HF
5
5
12K
10
10
15
15
5
2
MF
5
2.5K
Mid: 2.5KHz +/- 15dB peaking type
Low: 80Hz +/- 15dB shelving type
10
10
15
5
15
LF
AUX SEND
3
5
80Hz
10
10
The AUX section is often used for a monitor mix in a live sound mixing, or for a
headphone mix in a recording application. Each input channel includes an Aux send
which controls the amount of that channel’s signal that is sent to the Aux bus. For
more information on using the AUX control see the section “SENDING AN INDEPENDENT MIX
TO THE MONITOR SPEAKERS” on page 13 of this manual.
15
15
AUX
3
0
10
6
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Controls and Functions
MONO INPUT CHANNEL SECTION
BALANCE (Stereo Inputs Only)
4
5
The MDR624’s BALANCE control is used to place or position a mono
input into the stereo main Left and Right MIX bus. For a stereo input,
the balance control is used to center the sound between the Left and
Right Mix bus. You can create a stereo image by panning some input
signals to the left and others to the right.
0
BAL
4
L
R
PAN (Mono Inputs Only)
The MDR624’s PAN control is used to place or position the mono
signal into the stereo main Left and Right MIX bus. You can create a
stereo image by panning some input signals to the left and others to
the right. The MDR624’s PAN control is a Power-Pan circuit, which
includes a 3dB dip in the center position. This is desirable since
there’s a 3dB increase in gain when the mono input signal is heard in
both the Left and Right MIX bus.
PEAK LED
6
7
The MDR624’s MIC/LINE pre-amp also includes a CLIP LED which,
when illuminated, indicates that the signal is peaking or overloading.
To reduce distortion, lower the GAIN control to keep this LED from
staying on.
0
10
5
0
PAN
FADER
L
R
6
The MDR624’s rotary input FADER controls the overall channel level.
The input FADER features an audio taper and no detents for smooth
fades.
5
PEAK
10
0
7
LEVEL
CHANNEL 1
7
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Controls and Functions
MASTER SECTION
The MDR624’s Master section includes the master level controls for the MAIN mix, AUX and CR (Control
Room) / PHONES output, as well as, 2-track assign switches and LED metering for power and level. The
following section details the function controls and switches in the Master section.
MAIN LEVEL
8
9
The master MAIN control is the overall volume control for
the left and right mix bus. The MAIN LEVEL affects both
the Control ROOM signal which is output to the speakers
and the line level signal which is output from the MIX OUT
jacks.
L
CR OUTPUT
R
S
CR / PHONES
L
The C/ROOM + PHONES control is used to set the level
sent to the control room outputs, and also to the head-
phone jack.
N
MIX OUTPUT
R
2 TRACK INPUT AND OUTPUT
0
0
0
2T IN
2T OUT
HF
5
12K
The MDR624’s 2 Track section provides the connections
for playback and recording for an external device such as a
DAT, cassette recorder, CD or Mini Disk.
10
LEFT
LEFT
15
5
MF
RIGHT
RIGHT
2.5K
10
10 2TK TO CR
15
AUX RETURN
5
The 2TR TO CR switch is used to assign the
LF
5
80Hz
PHANTOM
POWER
2TR input to the Control Room output. If you
push down the 2TK TO CR button, signal will
be routed into the left and right Control Room
output and will be adjusted by the CR /
PHONES control knob.
10
15
0
10
CLIP
+12
AUX
2TK TO MIX
+6
0
11
-6
10
-12
-18
2TK TO MIX
11
2TK TO C/R
0
BAL
-24
L
R
10
The 2TR TO MIX switch is used to assign the 2TR input to
the MAIN mix bus. If you push the 2TR TO MIX button, the
signal present at the 2 TRACK IN will be routed to the left
and right MAIN output and the level will be controlled by
the MAIN LEVEL knob.
OUTPUT LEVEL
R
5
5
5
PEAK
10
0
10
0
10
VEL
LEVEL
LEVEL
NEL 5/6
CR / PHONES
MAIN LEVEL
8
9
8
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Controls and Functions
MASTER SECTION - continued
12 POWER LED
The Power LED lights up to indicate that the main POWER switch (located on the rear panel) is on.
- Phantom Power LED
13
14
This LED illuminates indicating that the 48 volt
phantom power is applied to the microphone
pre-amps enabling use with condenser micro-
phones. The +48V LED will light up when the
Phantom Power switch (located on the rear
panel) is switched to the ON position.
2T IN
2T OUT
HF
12K
10
LEFT
LEFT
MF
RIGHT
RIGHT
2.5K
Output Level Meter
10
The OUTPUT LEVEL METER allows you to
monitor the level of the signal which is being
sent to the MIX OUT jacks.
AUX RETURN
5
13
12
LF
80Hz
PHANTOM
POWER
15
10
NOTE: To avoid distortion, adjust the Main Level
control so that the 0 indicator LED lights occa-
sionally.
0
10
CLIP
+12
AUX
2TK TO MIX
2TK TO C/R
+6
0
Auxiliary Return
-6
The MDR624 has a stereo auxiliary return,
which can be accessed via the pair of 1/4-inch
phone jacks located on the top panel. The
Auxiliary Return can be used to connect any
stereo line level signal, but they are primarily
used to connect the output of external effects
processors.
-12
-18
BAL
-24
L
R
OUTPUT LEVEL
14
5
5
EAK
AUX RET
15
0
0
10
0
10
This adjusts the amount of signal that is com-
ing from the AUX RET jacks to the MAIN bus.
For more information on using the AUX control see
the section “USING AN EXTERNAL EFFECT” on page
13 of this manual.
LEVEL
LEVEL
CR / PHONES
MAIN LEVEL
9
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MDR624 Input and Output Connections
CHANNEL 1 – 6 MIC and LINE INPUTS
The MDR624’s channels 1 and 2 mono input channels each have a 1/4-inch connector for line level inputs and
XLR connectors for the MIC inputs. Channels 3/4 and 5/6 stereo input channels each have 1/4-inch connectors
for line level inputs. By using the GAIN control on channels 1 + 2, you can connect a variety of signal sources
from microphones to line level devices such as synthesizers, and drum machines. All the LINE and MIC inputs
are balanced. The MIC inputs are compatible with microphones with output impedances of 50~600 Ohms and
the LINE inputs are compatible with line level devices of 600 Ohms.
NOTE: It is not possible to simultaneously use both the LINE and MIC inputs on the same channel. Use only one
of the inputs for the appropriate source on each channel.
Following below is a detailed description of the MDR624’s input and output connectors.
AUX RET
LEFT/MONO
RIGHT
AUX SEND
MIC IN
MIC IN
Microphone Input - Mono Input
Channels
16
16
17
Use these inputs to connect Low Impedance
microphones and low level signals from direct
boxes. The MIC inputs have a nominal operating
level of –50dB through -20dB. The MIC inputs
also feature +48V phantom power, allowing you
to use condenser microphones. The Phantom
Power switch (located on the MDR624’s rear
panel) enables phantom power on all the micro-
phone inputs when set to the ON position. XLR
Connector pin-out - Pin 1: Ground, Pin 2: Hot (+),
Pin 3: Cold (-)
PHONES
LINE IN
LINE IN
3/L
5/L
30
30
GAIN
GAIN
LINE IN
LINE IN
18
6/R
4/R
5
60
5
60
+26
-26
+26
-26
17
18
Line Level Input - Mono Input Channels
Use these inputs to connect synthesizers, drum machines, effects processors or any line-level signal.
The LINE inputs have a nominal operating level of -40dB through - 10dB. TRS phone jacks Connector
pin-out - Sleeve: Ground, Tip: Hot (+), Ring: Cold (-)
Line Level Input - Stereo Input Channels
You can connect the outputs from stereo devices such as synthesizers, drum machines, effects proces-
sors or any stereo line-level signal. Use the LEFT input when connecting a mono input signal to the
Stereo Input channels. The LINE inputs have a nominal operating level of -40dB through - 10dB. TRS
phone jacks Connector pin-out - Sleeve: Ground, Tip: Hot (+), Ring: Cold (-)
10
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MDR624 Input and Output Connections
MASTER SECTION INPUT AND OUTPUT JACKS
The MDR624 features several output connectors allowing you to interface a variety of external devices. A stereo
recording device, such as a cassette recorder, can be connected to the 2 Track jacks, and power amplifiers or
powered monitors can be connected to the CONTROL ROOM and MAIN output jacks.
AUX Send
19
The signal present at the AUX output is sent from the AUX bus, which is fed from the AUX send on the
input channels. The AUX output can be used as the
19
MONITOR MIX bus in a live sound situation by con-
necting the output to a power amp and monitor speak-
er.
AUX RET
LEFT/MONO
RIGHT
AUX SEND
L
AUX RETURN LEFT/RIGHT
20
21
CR OUTPUT
R
20
The AUX RETURN LEFT/RIGHT are stereo inputs that
are generally used to connect the outputs of an effects
processor, but can also accept the signal from any line
level source like a keyboard, recorder and even anoth-
er mixer. The signal connected to the AUX RETURN
LEFT/RIGHT will feed the main LEFT/RIGHT MIX bus.
The overall level is controlled by the AUX RET knob
located in the master section on the front panel. Use
the LEFT/MONO input when connecting a mono input
signal to the AUX RETURN.
PHONES
23
L
L
5/L
LINE IN
LINE IN
MIX OUTPUT
22
6/R
R
R
21
22
CONTROL ROOM LEFT/RIGHT OUTPUT
0
0
2T IN
2T OUT
HF
HF
5
5
5
5
12K
12K
The Control Room outputs are used to connect a stu-
dio monitor system. The Control Room outputs have
the same output as the L/R MIX, however, the level
can be adjusted independently from the main mix
using the C ROOM/HEADPHONES control.
0
10
10
15
10
LEFT
LE
15
5
15
5
15
5
0
0
MF
MF
2.5K
5
RIGHT
RI
2.5K
0
10
10
15
10
15
15
15
24 25
MIX LEFT/RIGHT OUTPUT
In a live sound application, the LEFT/ RIGHT MIX outputs are connected to a power amplifier or powered
speakers. In a recording application, the LEFT/ RIGHT MIX outputs are used to connect to the inputs of a
stereo device such as computer sound card, DAT, or cassette recorder.
HEADPHONE OUTPUT
23
24
You can connect a standard pair of stereo headphones to the PHONES jack and depending on the posi-
tion of the 2T TO CR switch, you will hear either the 2-Track input or the MAIN mix.
2TR INPUT
The MDR624 features dual RCA connectors for the left and right 2-track input. You can use these inputs
to connect a CD, Cassette, Mini Disk, DAT or the output from a computer sound card. To listen to the
input connected to the 2T IN, be sure to check the position of the 2T To Mix and 2T TO CR switches. For
more information on using the 2 Track inputs, see the section “PLAYING BACK A CD USING 2T TO MIX ” on page 13 of
this manual.
25
2TR OUTPUT
If you want to record the mix from your MDR624, you can use the 2-track OUT connectors. The dual RCA
connectors can be connected to a CD, Cassette, Mini Disk, DAT or recorder, even the input of a computer
sound card for hard disk recording. For more information on using the 2 Track outputs, see the section “RECORDING
A MIX FROM THE MDR624 ” on page 13 of this manual.
11
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Operating the MDR624
BASIC OPERATION
The following section explains the basic operation of the MDR624.
CONNECTING MICROPHONES AND
INSTRUMENTS
1. Before connecting mics or instruments,
make sure that the power of all your sys-
Bass Guitar
Lead Guitar
tems components, including the MDR624,
are turned off. Also, make sure that the
Vocal
Direct Box
Signal Processor
Stereo Signal
Left and Right MIX faders are turned all
the way down.
2. Connect the cables to your microphones
Keyboards
and instruments, and insert the other end
of the cable firmly into the appropriate
input on the MDR624.
AUX RET
LEFT/MONO
RIGHT
AUX SEND
MIC IN
MIC IN
L
CR OUTPUT
R
PHONES
LINE IN
LINE IN
L
3/L
5/L
NOTE: SETTING THE INPUT GAIN - When
30
30
GAIN
GAIN
LINE IN
LINE IN
MIX OUTPUT
R
connecting a microphone to channels 1 + 2,
it’s a good idea to start with the Gain Control
turned all the way down. Set the input fader
to the "2 o’clock" position and slowly raise
the GAIN control until you see the CLIP LED
turn on. Now, back the GAIN control down
so that the CLIP LED only lights for a short
time during the loudest input the channel will
see.
6/R
4/R
5
60
5
60
+26
-26
+26
-26
0
0
0
0
0
0
0
0
2T IN
2T OUT
HF
HF
HF
HF
5
5
5
5
5
5
5
5
12K
12K
12K
12K
10
10
10
10
10
10
10
15
10
LEFT
LEFT
15
15
5
15
15
5
15
5
15
5
15
5
0
0
MF
MF
MF
MF
2.5K
5
5
5
RIGHT
RIGHT
2.5K
2.5K
2.5K
10
10
10
10
10
10
10
15
10
15
5
15
15
5
15
15
5
15
15
AUX RETURN
5
0
0
LF
LF
LF
LF
5
5
5
5
5
80Hz
80Hz
80Hz
80Hz
PHANTOM
POWER
10
10
10
10
10
10
10
15
10
15
15
15
15
15
15
15
0
10
CLIP
+12
AUX
AUX
AUX
AUX
2TK TO MIX
2TK TO C/R
+6
0
-6
0
10
0
10
0
10
0
10
-12
-18
0
0
0
0
PAN
PAN
BAL
BAL
-24
L
R
OUTPUT LEVEL
L
R
L
R
L
R
L
R
5
5
5
5
5
5
3. Switch on the power of any peripheral
devices, and then power up the MDR624.
0
10
1
0
10
2
0
10
0
10
0
10
0
10
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
CHANNEL
CHANNEL
CHANNEL 3/4
CHANNEL 5/6
HEADPHONES
MAIN LEVEL
NOTE: It is important to remember the
Golden Rule of audio … " LAST ON, FIRST OFF". Translated, this means that when turning on your system, you
should always turn your power amplifiers or powered monitors on LAST, and when turning your system off, turn
your power amps off FIRST. This helps avoid any loud pops caused by inrush current at power up, which can
sometimes damage loudspeakers.
4. Turn on your power amp or powered monitors and raise the level control to the manufacturers’ recommend-
ed operating level.
5. Set the Main Level fader in the MDR624’s master section to the "2 o’clock" position.
6. While speaking into the mic (or playing the instrument), adjust the channel Level control so that the "0" LED
of the MAIN section peak level meter lights occasionally.
7. You can shape the tone of each channel by adjusting the equalizer controls as desired.
12
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Operating the MDR624
SENDING AN INDEPENDENT MIX TO THE MONITOR SPEAKERS
The MDR624’s AUX send can be used to feed a separate set of amplifiers and loudspeakers for stage monitors.
This lets you build one stereo mix for the amplifiers and speakers facing the audience and the other mono mix for
the amplifiers and monitor speakers facing the musicians.
1. Raise the AUX controls for the channels that you wish to hear from the monitor speakers.
NOTE: The AUX controls are "PRE-FADER SENDS" which means they are not affected by the FADER
level settings of each channel. This allows you to create a mix for the monitors that is independent of the
main LEFT and RIGHT MIX.
AUX
AUX
AUX
AUX
2TK
0
10
0
10
0
10
0
10
2. In order to get the most gain from your monitor mix, use an external graphic equalizer (like a Samson S curve
131 or E31i) to cut out any frequencies that cause feedback. For more information, see the diagram on pg. 14.
USING AN EXTERNAL EFFECT
If you want to use an external device for effects processing, you can easily connect the unit using the MDR624
AUX bus. Follow the simple steps below to interface your
processor:
1. Set the L/R mix faders to the "2 o’clock" position.
AUX RET
LEFT/MONO
RIGHT
AUX SEND
L
CR OUTPUT
R
2. Raise the AUX knobs for the channels to which you want
the external effect to be applied.
PHONES
L
3/L
5/L
3. Set the input level of the external effect so that the sound is
not distorted and so that the effect’s input meter does not
indicate a clipped signal.
LINE IN
LINE IN
MIX OUTPUT
6/R
R
4/R
LEFT
OUTPUT
RIGHT
OUTPUT
0
0
2T IN
2T OUT
HF
HF
5
5
5
5
12K
12K
4. Use the AUX return control to adjust the level of the effects
processed by the external effects device.
10
10
10
15
10
LEFT
LEFT
INPUT
15
5
15
5
15
5
0
0
MF
MF
2.5K
5
RIGHT
RIGHT
2.5K
10
10
10
15
10
15
5
15
15
PLAYING BACK A CD USING 2T TO MIX
AUX RETURN
5
0
0
LF
LF
5
5
5
80Hz
80Hz
PHANTOM
POWER
10
10
10
15
10
The MDR624 has a dedicated input for playing back a CD,
Tape or Mini Disk, which is heard in the Control Room and
Headphone outputs or the main outputs. Below is a descrip-
15
15
15
0
10
Effects Processor
CLIP
+12
+6
AUX
AUX
2TK TO MIX
tion of how you can play back a CD, Tape or MD using the MDR624’s 2 TRACK INPUT.
•
•
Turn the CONTROL ROOM and MAIN LEVEL knob all the way down.
R
If you want to hear the 2-track in the Control Room
PHONES
outputs, engage the 2T to CR switch. If you want to
L
L
hear the 2-track in the the MAIN outputs, engage
the 2T TO MIX switch.
LINE IN
MIX OUTPUT
R
R
•
•
Start playback on the CD, Tape or MD player.
0
2T IN
2T OUT
HF
5
5
12K
10
10
LEFT
LEFT
RECORD
INPUT
15
5
15
5
Now raise the CONTROL ROOM level or main level
until you reach a comfortable listening level.
0
MF
RIGHT
RIGHT
2.5K
10
10
15
5
15
AUX RETURN
5
0
OUTPUT
LF
5
R
L
80Hz
PHANTOM
POWER
RECORDING A MIX FROM THE MDR624
10
10
R
L
15
15
0
10
CLIP
+12
You can record the audio from the MDR624’s mixer section
including the MIC, LINE, TAPE IN and AUX inputs to a
Cassette deck, MD, DAT or any other type of recorder using
the 2 Track outputs. Simply connect the MDR624’s 2-Track
OUT to the input jacks of the recorder as shown in the dia-
AUX
2TK TO MIX
2TK TO C/R
+6
0
-6
0
10
-12
-18
0
BAL
-24
L
R
OUTPUT LEVEL
CD BURNER
L
R
gram to the right. Connect the recorders outputs to the 2 Track in jacks as shown.
13
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MDR624 System Set-Ups
MDR624 LIVE SOUND SET-UP
14
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MDR624 System Set-Ups
MDR624 RECORDING SET UP
15
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MDR624 Wiring Guide
CONNECTING THE MDR624
The are several ways to interface the MDR624 to support a variety of applications. The MDR624 features bal-
anced inputs and outputs, so connecting balanced and unbalanced signals is possible.
Unbalanced 1/4” Connector
Balanced TRS 1/4” Connector
XLR Balanced Wiring Guide
16
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MDR624 Specifications
Mono input channels
Microphone input
Frequency response
Distortion (THD&N)
Gain range
electronically balanced, discrete input configuration
10Hz to 45kHz, +0/- 3dB
0.05% at +4dBu, 1kHz
5dB to 60dB(MIC)
SNR (Signal to Noise Ratio)
110dB
Line input
electronically balanced
10Hz to 45kHz, +0/ -3dB
0.05% at +4dBu, 1kHz
-40dBu to -10dBu
Frequency response
Distortion (THD&N)
Sensitivity range
Stereo input channels
Line input
balanced
Frequency response
Distortion (THD&N)
10Hz to 55kHz,+0/-3dB
0.05% at +4dBu, 1kHz
Impedances
Microphone input
All other inputs
Tape out
3.6Kohm
10Kohm or greater
1Kohm
All other outputs
120ohm
Equalization
Hi shelving
Mid bell
+/- 15dB @12kHz
+/- 15dB @2.5kHz
+/- 15dB @80Hz
Low shelving
Main Mix Section
Noise(Bus noise)
Fader 0 dB, channels muted:100.0dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned and set to UNITY gain:
-90dBr(ref.: 4dBu)
+22dBu balanced
0 to +15dB
Max output
AUX Return gain range
AUX Send max out
+22dBu
Power supply
Main Voltage
Europe
(AC/AC Adaptor)
USA/Canada 95-120V~,60Hz
210-230V~,50Hz
240V~,50Hz
U.K./Australia
Power Consumption
10Watts
Physical
Dimension
Net weight
(W, D, H) 187mm 257mm 36/50mm
3.7 lb. (1.7 kg) Without Adaptor
17
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Block Diagram
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Notes
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Notes
20
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Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
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