Oxmoor RMX-62 Installation Manual

RMX-44™ & RMX-62

MIXING MATRIX

™

Installation

&

Operation

Manual

TABLE OF CONTENTS

RMX-44 & RMX-62 INTRODUCTION ............................................................................................. 1

RMX-44 CALLOUTS ..................................................................................................................... 2

RMX-44 BLOCK DIAGRAM ........................................................................................................... 3

RMX-62 CALLOUTS ..................................................................................................................... 4

RMX-62 BLOCK DIAGRAM ........................................................................................................... 5

RMX-44 & RMX-62 SET-UP ..........................................................................................................6

RMX-44 & RMX-62 SET-UP (CONTINUED) .................................................................................... 7

RMX-44 AUDIO & CONTROL PORT PIN ASSIGNMENTS ................................................................ 8

RMX-62 AUDIO & CONTROL PORT PIN ASSIGNMENTS ................................................................ 9

RMX-44 & RMX-62 APPLICATIONS ............................................................................................. 10

USER INSTALLATION & SET-UP NOTES ....................................................................................... 11

USER INSTALLATION & SET-UP NOTES ....................................................................................... 12

RMX-44 & RMX-62 SPECIFICATIONS .......................................................................................... 13

OXMOOR FACTORY SERVICE ...................................................................................................... 14

OXMOOR TWO YEAR LIMITED WARRANTY .................................................................................. 14

CONTACT OXMOOR .................................................................................................................... 14

RMX-44 & RMX-62 INTRODUCTION

• Front-panel input trimmers with +/- 15 dB gain adjustment

• Logic control port for setting various output configurations,
including a mix of the inputs

• Electronically balanced, XLR-type inputs and outputs

• +24 dBu input signal levels

• +24 dBm output signal levels

• Built-in RF suppression

• UL Listed

The RMX-44 and RMX-62 Mixing Matrixes may
be used as buffer/mixer/distribution amplifiers.
The RMX-44 offers a four-in by four-out config­uration while the RMX-62 is a six-in by two-out
system. Each compact unit is housed in a 1U,
rackmount chassis and weighs just under 8.5
pounds.

The RMX-44 and RMX-62 are intended for use in
sound reinforcement, permanent installations,
playback, and other audio systems requiring
high-quality operation with flexible audio rout­ing from remote locations.

The RMX-44 unit allows, for example, stereo com­ponents and their sum to be assigned to separate
output lines. High and low input and output lev­els can also be freely intermixed without addi­tional hardware, facilitating such common con­version tasks as interfacing hi-fi equipment with
professional audio systems.

The RMX-44 and RMX-62 input stages are elec­tronically balanced and fitted with standard 3-pin,
XLR-type connectors. Front-panel gain trimmers
enable the installer to compensate for various in­put signal levels. RF suppression circuitry safe­guards against radio-frequency interference in
hostile environments.

For enhanced flexibility on both units, each out­put driver can be set for balanced or unbalanced
operation using internal jumpers. The output
stages will deliver a +24 dBm maximum output
level, with overall 20Hz to 20 kHz frequency re­sponse, +0, -0.3 dB.

Both devices are also available with optional out­put transformers. Designate Model RMX-44T or
Model RMX-62T. Transformer equipped version
may be operated Balanced or Unbalanced with­out any change to the internal jumpers.

Designed to satisfy exacting professional stan­dards, the RMX-44 and RMX-62 offer excellent
performance in highly dependable packages.
Their impressive audio specifications are ideally
suited to recording and broadcast applications,
yet their rugged chassis and exceptional immu­nity to environmental stress make them an ideal
choice for demanding road work and commer­cial installations.

The RMX-44, RMX-44T, RMX-62, and RMX-62T
Mixing Matrixes are Underwriters Laboratories
(UL) Listed.

Page 1

RMX-44 CALLOUTS

1

OXMOOR

POWER

OUTPUT D OUTPUT C

RMX-44 MIXING MATRIX

7

7

OUTPUT B

INPUT 1

OUTPUT A

4

4

INPUT 2 INPUT 3 INPUT 4

INPUT 4 INPUT 3

2

Figure 1.1: Front and Rear Panel Views of RMX-44

(Callouts refer to Figures 1.1, 1.2, and 1.3)

1. POWER LED - The front panel LED is illuminated
when the unit is on. The absence of an On/Off
switch is a performance safety feature, eliminating
accidental shutdown during operation.

2. INPUT CONNECTORS - XLR inputs, Pin 2 positive,
accept balanced or unbalanced signals from line­level devices.

3. INPUT STAGE - The RF-suppressed input circuit is
electronically balanced (differential), and capable
of handling a maximum signal level of +24 dBu.
Balanced input impedance is approximately 80k
ohms, with a nominal input level range of -10 to
+8 dBu.

INPUT 2

INPUT 1

PIN 2 POSITIVE ON ALL
AUDIO CONNECTIONS

CONTROL PORT

8

FUSE

11

POWER

101182

10

CHASSIS

SERIAL NUMBER

9

7. OUTPUT CONNECTORS - XLR outputs, pin 2

positive, accommodate balanced or unbalanced
lines.

8. CONTROL PORT CONNECTOR - Female, 25-pin,
standard D-sub connector. Provides contacts for
jumpers or external switching to assign routing
of inputs to outputs. Latching contact closures
required (see SET-UP). Additional contacts
provide system mute capability and +15 VDC, 50
mA, output for powering LEDs, etc.

9. CHASSIS GROUND POST - Nuts on a threaded
stud enable the installer to conveniently secure a
ground wire to the chassis.

9

9

4. INPUT GAIN TRIM POTS - (labelled "INPUT 1,"
"INPUT 2,” etc.) Accessed through the front panel
with a small flat-blade screwdriver, these trim
pots adjust the input stage gain +/-15 dB, to
compensate for varying input signal levels.

5. OUTPUT STAGE - The output stage is electronically
balanced (push-pull) and AC coupled. Output
impedance is approximately 150 ohms. Each
output can provide a maximum level of +24 dBm
into a 600 ohm load, or +26 dBu unterminated.

6. BALANCED/UNBALANCED JUMPER BLOCKS ­These permit each output to be unbalanced
independently, if necessary (see SET-UP).

10. POWER CONNECTOR - Standard IEC 3-pin
connector for AC power cord. Use only with
grounded (3-wire) outlets. Cord sets are available
for all world connection standards.

11. FUSE HOLDER - Replace only with approved

type of fuse in a rating appropriate to the mains
voltage, as indicated on back panel (see

SPECIFICATIONS).

Page 2

RMX-44 BLOCK DIAGRAM

2 3 4 5 76

2 3 4 5 6 7

21

1

2

3

21

INPUT 1

S

OUTPUT A

S

3

2

1

A

B

3

21

3

21

3

FRONT PANEL

INPUT 2

INPUT 3

INPUT 4

Figure 1.2: Block Diagram of RMX-44 Mixing Matrix

4

OUTPUT B

S

OUTPUT C

S

OUTPUT D

CONTROL PORT

1

3

1

2

3

1

2

3

C

D

8

8

6

REAR

PANEL

27

Figure 1.3: Interior View of RMX-44 Mixing Matrix

Page 3

10118

9