Samson MDR624 User Manual
MDR Series Mixers
MIC IN MIC IN
SIX CHANNEL MIXER
LINE IN
30
GAIN
GAIN
5
60
5
-26
+26
-26
0
HF
55
12K
1010
15
15
15
0
MF
5
5
5
2.5K
1010
15
15
15
0
0
LF
5155
5155
80Hz
1010
15
15
AUX
010
010
0
0
PAN
R
L
L
55
010
010
LEVEL
CHANNEL 2 CHANNEL 3/4 CHANNEL 5/6 CR / PHONES MAIN LEVELCHANNEL 1
LINE IN
LEVEL
3/L
30
4/R
60
+26
0
HF
55
12K
1010
15
0
MF
5
2.5K
1010
15
0
0
LF
80Hz
1010
AUX
0
0
PAN
R
AUX SEND
AUX RET
LEFT/MONO
RIGHT
PHONES
5/L
LINE IN LINE IN
6/R
0
0
HF
55
12K
1010
15
15
15
0
0
MF
5
5
5
2.5K
1010
15
15
15
0
0
0
0
LF
5155
5155
80Hz
1010
15
15
AUX
010
010
0
0
0
0
BAL
R
L
L
55
PEAKPEAKPEAK PEAK
010
010
LEVEL
LEVEL
L
CR OUTPUT
R
L
MIX OUTPUT
R
55
12K
1010
15
MF
5
2.5K
1010
15
80Hz
1010
AUX
BAL
R
HF
LF
2T IN 2T OUT
LEFT
RIGHT
AUX RETURN
5
010
2TK TO MIX
2TK TO C/R
5
010
LEVEL
LEFT
RIGHT
PHANTOM POWER
CLIP
+12
+6
0
-6
-12
-18
-24
LR
OUTPUT LEVEL
5
010
LEVEL
Safety Instructions/Consignes de sécurité/Sicherheitsvorkehrungen/Instrucciones de seguridad
ACHTUNG: Um die Gefahr eines Brandes oder Stromschlags zu verringern, soll-
ten Sie dieses Gerät weder Regen noch Feuchtigkeit aussetzen.Um die Gefahr
eines Stromschlags zu verringern, sollten Sie weder Deckel noch Rückwand des
Geräts entfernen. Im Innern befinden sich keine Teile, die vom Anwender
gewartet werden können. Überlassen Sie die Wartung qualifiziertem
Fachpersonal.Der Blitz mit Pfeilspitze im gleichseitigen Dreieck soll den Anwender
vor nichtisolierter “gefährlicher Spannung” im Geräteinnern warnen. Diese
Spannung kann so hoch sein, dass die Gefahr eines Stromschlags besteht. Das
Ausrufezeichen im gleichseitigen Dreieck soll den Anwender auf wichtige
Bedienungs- und Wartungsanleitungen aufmerksam machen, die im mitgelieferten
Informationsmaterial näher beschrieben werden.
Wichtige Sicherheitsvorkehrungen
1. Lesen Sie alle Anleitungen, bevor Sie das Gerät in Betrieb nehmen.
2. Bewahren Sie diese Anleitungen für den späteren Gebrauch gut auf.
3. Bitte treffen Sie alle beschriebenen Sicherheitsvorkehrungen.
4. Befolgen Sie die Anleitungen des Herstellers.
5. Benutzen Sie das Gerät nicht in der Nähe von Wasser oder Feuchtigkeit.
6. Verwenden Sie zur Reinigung des Geräts nur ein feuchtes Tuch.
7. Blockieren Sie keine Belüftungsöffnungen. Nehmen Sie den Einbau des
Geräts nur entsprechend den Anweisungen des Herstellers vor.
8. Bauen Sie das Gerät nicht in der Nähe von Wärmequellen wie Heizkörpern,
Wärmeklappen, Öfen oder anderen Geräten (inklusive Verstärkern) ein, die
Hitze erzeugen.
9. Setzen Sie die Sicherheitsfunktion des polarisierten oder geerdeten Steckers
nicht außer Kraft. Ein polarisierter Stecker hat zwei flache, unterschiedlich breite Pole. Ein geerdeter Stecker hat zwei flache Pole und einen dritten
Erdungsstift. Der breitere Pol oder der dritte Stift dient Ihrer Sicherheit. Wenn
der vorhandene Stecker nicht in Ihre Steckdose passt, lassen Sie die veraltete
Steckdose von einem Elektriker ersetzen.
10. Schützen Sie das Netzkabel dahingehend, dass niemand darüber laufen und
es nicht geknickt werden kann. Achten Sie hierbei besonders auf Netzstecker,
Mehrfachsteckdosen und den Kabelanschluss am Gerät.
11. Ziehen Sie den Netzstecker des Geräts bei Gewittern oder längeren
Betriebspausen aus der Steckdose.
12. Überlassen Sie die Wartung qualifiziertem Fachpersonal. Eine Wartung ist
notwendig, wenn das Gerät auf irgendeine Weise, beispielsweise am Kabel
oder Netzstecker beschädigt wurde, oder wenn Flüssigkeiten oder Objekte in
das Gerät gelangt sind, es Regen oder Feuchtigkeit ausgesetzt war, nicht
mehr wie gewohnt betrieben werden kann oder fallen gelassen wurde.
WARNING: To reduce the risk of fire or electric shock, do not expose this unit to
rain or moisture. To reduce the hazard of electrical shock, do not remove cover or
back. No user serviceable parts inside. Please refer all servicing to qualified personnel.The lightning flash with an arrowhead symbol within an equilateral triangle,
is intended to alert the user to the presence of uninsulated "dangerous voltage"
within the products enclosure that may be of sufficient magnitude to constitute a
risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
Important Safety Instructions
1. Please read all instructions before operating the unit.
2. Keep these instructions for future reference.
3. Please heed all safety warnings.
4. Follow manufacturers instructions.
5. Do not use this unit near water or moisture.
6. Clean only with a damp cloth.
7. Do not block any of the ventilation openings. Install in accordance with the
manufacturers instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wide blade or third
prong is provided for your safety. When the provided plug does not fit your
outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on and pinched particularly at
plugs, convenience receptacles and at the point at which they exit from the
unit.
11. Unplug this unit during lightning storms or when unused for long periods of
time.
12. Refer all servicing to qualified personnel. Servicing is required when the unit
has been damaged in any way, such as power supply cord or plug damage, or
if liquid has been spilled or objects have fallen into the unit, the unit has been
exposed to rain or moisture, does not operate normally, or has been dropped.
PRECAUCION: Para reducir el riesgo de incendios o descargas, no permita que
este aparato quede expuesto a la lluvia o la humedad. Para reducir el riesgo de
descarga eléctrica, nunca quite la tapa ni el chasis. Dentro del aparato no hay
piezas susceptibles de ser reparadas por el usuario. Dirija cualquier reparación al
servicio técnico oficial. El símbolo del relámpago dentro del triángulo equilátero
pretende advertir al usuario de la presencia de “voltajes peligrosos” no aislados
dentro de la carcasa del producto, que pueden ser de la magnitud suficiente como
para constituir un riesgo de descarga eléctrica a las personas. El símbolo de exclamación dentro del triángulo equilátero quiere advertirle de la existencia de importantes instrucciones de manejo y mantenimiento (reparaciones) en los documentos
que se adjuntan con este aparato.
Instrucciones importantes de seguridad
1. Lea todo este manual de instrucciones antes de comenzar a usar la unidad.
2. Conserve estas instrucciones para cualquier consulta en el futuro.
3. Cumpla con todo lo indicado en las precauciones de seguridad.
4. Observe y siga todas las instrucciones del fabricante.
5. Nunca utilice este aparato cerca del agua o en lugares húmedos.
6. Limpie este aparato solo con un trapo suave y ligeramente humedecido.
7. No bloquee ninguna de las aberturas de ventilación. Instale este aparato de
acuerdo a las instrucciones del fabricante.
8. No instale este aparato cerca de fuentes de calor como radiadores, calentadores, hornos u otros aparatos (incluyendo amplificadores) que produzcan
calor.
9. No anule el sistema de seguridad del enchufe de tipo polarizado o con toma
de tierra. Un enchufe polarizado tiene dos bornes, uno más ancho que el
otro. Uno con toma de tierra tiene dos bornes normales y un tercero para la
conexión a tierra. El borne ancho o el tercero se incluyen como medida de
seguridad. Cuando el enchufe no encaje en su salida de corriente, llame a un
electricista para que le cambie su salida anticuada.
10. Evite que el cable de corriente quede en una posición en la que pueda ser
pisado o aplastado, especialmente en los enchufes, receptáculos y en el
punto en el que salen de la unidad.
11. Desconecte de la corriente este aparato durante las tormentas eléctricas o
cuando no lo vaya a usar durante un periodo de tiempo largo.
12. Dirija cualquier posible reparación solo al servicio técnico oficial. Deberá
hacer que su aparato sea reparado cuando esté dañado de alguna forma,
como si el cable de corriente o el enchufe están dañados, o si se han derramado líquidos o se ha introducido algún objeto dentro de la unidad, si esta ha
quedado expuesta a la lluvia o la humedad, si no funciona normalmente o si
ha caído al suelo.
ATTENTION: Pour éviter tout risque d’électrocution ou d’incendie, ne pas
exposer cet appareil à la pluie ou à l’humidité. Pour éviter tout risque d’électrocution, ne pas ôter le couvercle ou le dos du boîtier. Cet appareil ne contient aucune
pièce remplaçable par l'utilisateur. Confiez toutes les réparations à un personnel qualifié. Le signe avec un éclair dans un triangle prévient l’utilisateur de la
présence d’une tension dangereuse et non isolée dans l’appareil. Cette tension
constitue un risque d’électrocution. Le signe avec un point d’exclamation dans
un triangle prévient l’utilisateur d’instructions importantes relatives à l’utilisation
et à la maintenance du produit.
Consignes de sécurité importantes
1. Veuillez lire toutes les instructions avant d’utiliser l’appareil.
2. Conserver ces instructions pour toute lecture ultérieure.
3. Lisez avec attention toutes les consignes de sécurité.
4. Suivez les instructions du fabricant.
5. Ne pas utiliser cet appareil près d’une source liquide ou dans un lieu
humide.
6. Nettoyez l’appareil uniquement avec un tissu humide.
7. Veillez à ne pas obstruer les fentes prévues pour la ventilation de l’appareil.
Installez l’appareil selon les instructions du fabricant.
8. Ne pas installer près d’une source de chaleur (radiateurs, etc.) ou de tout
équipement susceptible de générer de la chaleur (amplificateurs de puissance par exemple).
9. Ne pas retirer la terre du cordon secteur ou de la prise murale. Les fiches
canadiennes avec polarisation (avec une lame plus large) ne doivent pas
être modifiées. Si votre prise murale ne correspond pas au modèle fourni,
consultez votre électricien.
10. Protégez le cordon secteur contre tous les dommages possibles (pincement, tension, torsion,, etc.). Veillez à ce que le cordon secteur soit libre,
en particulier à sa sortie du boîtier.
11. Déconnectez l’appareil du secteur en présence d’orage ou lors de périodes
d’inutilisation prolongées.
12. Consultez un service de réparation qualifié pour tout dysfonctionnement
(dommage sur le cordon secteur, baisse de performances, exposition à la
pluie, projection liquide dans l’appareil, introduction d’un objet dans le boîtier, etc.).
Table of Contents
Introduction 2
MDR624 Features 3
Controls and Functions
Front and Rear Panel Layout 4–5
Mono Input Channel Section 6–7
Master Section 8–9
MDR624 Input and Output Connections 10–11
Operating the MDR624 12–13
System Set-ups 14–15
MDR624 Wiring Guide 16
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
www.samsontech.com
2
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 levels 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 reinforcement 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 support 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 recommend 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.
Introduction
3
MDR624 Features
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 selected 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.
AUX SEND
LINE IN
30
5
60
-26
+26
0
55
1010
15
15
0
5
5
2.5K
1010
15
15
0
0
5155
80Hz
1010
15
AUX
010
0
0
PAN
R
L
010
LEVEL
CHANNEL 2 CHANNEL 3/4 CHANNEL 5/6 CR / PHONES MAIN LEVELCHANNEL 1
AUX RET
LEFT/MONO
RIGHT
3/L
5/L
LINE IN LINE IN
6/R
4/R
0
HF
55
12K
12K
1010
15
15
0
MF
MF
5
5
2.5K
1010
15
15
0
0
LF
5155
80Hz
1010
15
AUX
010
0
0
BAL
R
L
55
PEAKPEAKPEAK PEAK
010
LEVEL
PHONES
HF
15
15
LF
15
L
CR OUTPUT
R
L
MIX OUTPUT
R
0
HF
55
12K
1010
15
0
MF
5
5
2.5K
1010
15
0
0
LF
5155
80Hz
1010
AUX
010
0
0
BAL
R
L
010
LEVEL
2T IN 2T OUT
LEFT
RIGHT
AUX RETURN
5
010
2TK TO MIX
2TK TO C/R
5
010
LEVEL
LEFT
RIGHT
PHANTOM POWER
CLIP
+12
+6
0
-6
-12
-18
-24
LR
OUTPUT LEVEL
5
010
LEVEL
MIC IN MIC IN
LINE IN
30
GAIN
GAIN
5
60
-26
+26
0
HF
55
12K
1010
15
15
0
MF
5
5
2.5K
1010
15
15
0
0
LF
5155
80Hz
1010
15
AUX
010
0
0
PAN
R
L
55
010
LEVEL
4
Controls and Functions
Front and Rear Panel Layout
10
1
2
11 12
MIC IN MIC IN
AUX RET
LEFT/MONO
3
RIGHT
AUX SEND
PHONES
13
L
CR OUTPUT
R
14
15 16
17
18
LINE IN
30
GAIN
5
4
-26
0
60
+26
5
15
15
0
6
7
5
15
15
0
0
5
15
15
8
010
9
0
0
R
L
55
GAIN
HF
55
12K
1010
MF
5
2.5K
1010
LF
5
80Hz
1010
AUX
PAN
LINE IN
30
5
60
-26
+26
0
HF
55
12K
1010
15
15
0
MF
5
5
2.5K
1010
15
15
0
0
5
15
010
L
LF
5
80Hz
1010
15
AUX
0
0
PAN
R
3/L
4/R
15
5
15
5
15
010
L
5/L
LINE IN LINE IN
6/R
0
HF
55
12K
1010
15
0
0
0
0
0
55
15
MF
5
5
2.5K
1010
15
15
LF
5
5
80Hz
1010
15
15
AUX
010
BAL
R
L
PEAKPEAKPEAK PEAK
0
0
0
0
0
0
L
MIX OUTPUT
R
HF
55
12K
1010
15
MF
5
2.5K
1010
15
LF
5
80Hz
1010
15
AUX
BAL
R
2T IN 2T OUT
LEFT
RIGHT
AUX RETURN
5
010
2TK TO MIX
2TK TO C/R
5
LEFT
RIGHT
PHANTOM POWER
CLIP
+12
+6
0
-6
-12
-18
-24
LR
OUTPUT LEVEL
5
19
20
21
22
23
A
010
LEVEL
B
OFF
ON
POWER
MADE IN CHINA
C
010
LEVEL
CHANNEL 2 CHANNEL 3/4 CHANNEL 5/6 CR / PHONES MAIN LEVELCHANNEL 1
PHANTOM
ON
OFF
AC ADAPTOR
010
LEVEL
010
LEVEL
010
LEVEL
010
262728
DESIGNED AND ENGINEERED IN THE UNITED STATES BY SAMSON TECHNOLOGIES
CAUTION
RISK OF ELECTRICAL SHOCK
DO NOT OPEN
RISQUE DE SHOCK ELECTRIQUE
NE PAS OUVRIR
SERIAL NUMBER :
CAUTION: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT REMOVE BOTTOM COVER
NON SERVICEABLE PARTS INSIDE
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
REFER SERVICING TO QUALIFIED PERSONNEL
LEVEL
24
25
5
Front and Rear Panel Layout
FRONT PANEL
1 MIC – Input connector for Low-Noise Microphone pre-
amp.
2 LINE –Input connector for Line level inputs.
3 GAIN – Used to set the input level of the mic pre and line
input.
4 HIGH FREQUENCY – Controls the high band of the
Channel Equalizer, +/- 15 dB at 12KHz.
5 MID FREQUENCY – Controls the mid band of the Channel
Equalizer, +/- 15 dB at 2.5KHz.
6 LOW FREQUENCY – Controls the low band of the Channel
Equalizer, +/- 15 dB at 80Hz.
7 AUX – Pre fader auxiliary send that can be used with an
external effects processor, or to create a cue or monitor
mix.
8 PAN – Controls the channel’s position between left and
right in the stereo bus.
9 PEAK – Red LED will illuminate indicating when the
GAIN has been adjusted too high.
10 LEVEL – Audio taper fader provides smooth control over
level changes.
11 RIGHT LINE – 1/4-inch phone input connector for the right
line input for the stereo channels.
12 LEFT LINE - 1/4-inch phone input connector for the Left
Line input for the stereo channels.
13 AUX RET – Input connector from external line level
sources.
14 AUX SEND – Line level output from the Auxiliary bus.
15 HEADPHONE JACK – Connect stereo headphones 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.
18 2 TRACK INPUTS – Connect the output from a DAT,
Cassette, Mini Disk or Hard Disk Recording system.
19 2 TRACK OUTPUTS – Connect to the input of a DAT,
Cassette, Mini Disk or Hard Disk Recording system.
20 AUX RETURN – Used to mix in level of the effects
return.
21 PHANTOM – Indicates that the 48 Volt Phantom
Power is on.
22 POWER – Indicates the MDR624 is powered up.
23 OUTPUT METER - Eight segment display with VU
ballistics indicates main Mix level.
24 2 TRACK TO MIX - Switch used to mix the 2 track
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
the Left and Right main Mix outputs.
27 C ROOM/HEADPHONE – Adjusts the volume of the
control room speakers or headphones.
28 BALANCE – Controls the channel’s position between
left and right in the stereo inputs.
REAR PANEL
A POWER – Switches on the MDR624’s main power.
B PHANTOM – Engages the 48-Volt Phantom power
supply to microphone pre-amps.
CAC ADAPTOR INLET – Connect External AC power
supply here.
Front and Rear Panel Layout
6
Controls and Functions
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 connectors. 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
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-
mation on using the GAIN control see the section “CONNECTING MICROPHONES AND INSTRUMENTS” on page 12 of this manual.
CHANNEL EQUALIZER
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 frequency 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
Mid: 2.5KHz +/- 15dB peaking type
Low: 80Hz +/- 15dB shelving type
AUX SEND
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.
G
1
2
1
2
3
3
MONO INPUT CHANNEL SECTION
GAIN
5
-26
30
60
+26
0
15
15
15
0
5
0
0
5
010
15
15
15
55
5
5
HF
12K
1010
MF
2.5K
1010
LF
80Hz
1010
AUX
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