Rolls RM424 Users Manual

OPERATION AND SET UP

REMOTE VOLUME

+15

CH.2

WIPER

COMM. +15

CH.1

WIPER

The remote volume section on the rear panel of the RM424 allows the installer to place remote vol­ume controls in any or all of the zones connected to the RM424. Wiring information is silk screened
above each remote volume connector.
Q: Does the remote volume wire carry audio signal?
A: No, the remote volume wire only carries a DC control voltage that varies according to the position
of the remote volume pot (10-100K Ohm linear potentiometer recommended) . Use of the remote
volume feature will not introduce any noise or cause any signal loss.
Q: What is the maximum length that I can run a remote volume wire?
A: Wire size can affect the maximum length. You can run up to 200 feet reliably, and with high quality
wire up to 1000 feet.

Below is a diagram of how to connect the pots to the remote volume Phoenix connectors.

REMOTE PAD: 5 pin Phoenix connector for connection to a remote potentiometer for remote volume
control. A 100K Ohm audio taper potentiometer is recommended (others will work).

+15: Connection to potentiometer.
WIPER: Connection to potentiometers wiper (middle pin).
COMM: Common Ground for connection to pots.

As a note: If the potentiometer pad is working opposite of what you intended just reverse the wires
going to that potentiometer.

REMOTE VOLUME

+15

CH.4

WIPER

CH.3

WIPER

COMM. +15

RM424

4 Zone Mixer

HEADPHONE

ZONE 1

MIC/CHANNEL 2

MASTER VOLUME

ZONE 2

MIC/LINE

MONITOR

MONITOR

1/8”

IN

4

3

OFF=UP

ON=DOWN

TALK OVER ZONE ASSIGNMENT

34

2

1

PHANTOM POWER

www.rolls.com

MIC 1

ZONE

MONITOR

1

3

4

2

REMOTE VOLUME

OUTPUT 4

CH.4

WIPER

+15

+

VDC

-

PS27s

COMM. +15

ZONE FOUR ZONE THREE ZONE TWO

MIC/CHANNEL 2

1

CH.3

WIPER

ZONE

34

2

OUTPUT 3

CHANNEL 3

OUTPUT 2

ZONE

34

2

1

REMOTE VOLUME

CH.2

WIPER

+15

COMM. +15

MONITOR

CHANNEL 4

OUTPUT 1

ZONE ONE

1

ZONE

2

3

SERIAL NUMBER

4

MONITOR

CH.1

WIPER

SPECIFICATIONS

Input Impedance: 10K Ohms balanced Line
600 Ohms balanced Mic
10K Ohms unbalanced RCA
Output Impedance: 50 Ohms balanced XLR
Max Input Level: Mic: -30 dB
Source: +22 dB
Phantom Power: +48 Volts DC
Input Connectors: XLR and RCA
Outputs: 4 ea. XLR
Max Gain: 60 dB mic
30 dB line
S/N Ratio: >75 dB
THD: < .3%
IMD (SMPTE): < .3%
CMRR: 60 dB
Frequency Response: 20Hz to 20kHz +/- 0 dB
Power Adapter: 15VDC
Weight: 7 lbs (3KG)
Size: 19” x 1.75” x 6.5”
(48cm x 4.5cm x 17cm)

NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWLEDGE OF

AUDIO ELECTRONICS, BALANCED AND UNBALANCED CONNECTIONS, AND

ZONE 3

ZONE 4

RM424

4 Zone Mixer

MIC 1

MIC/LINE

MIC

INPUT LEVEL

LINE

ROLLS CORPORATION

SALT LAKE CITY, UTAH

01/13

PROPER SIGNAL LEVEL SETTINGS. FOR PROPER SETUP AND USE CONTACT

YOUR DEALER.

ROLLS CORPORATION

5968 South 350 West

Salt Lake City, UT 84107

Phone [phone]

FAX [phone]

Quick Start Guide

www.rolls.com

INTRODUCTION

A

INSPECTION

1. Unpack and inspect the RM424 box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest
saving the shipping carton and packing materials for safely transporting the unit in the future.

2. Please visit our web site at www.rolls.com and click on the Register Your Warranty Here button.

MIC 1

ZONE 1

OPERATION AND SET UP CONT.

MASTER VOLUME

ZONE 2

ZONE 3

ZONE 4

MIC/LINE

MIC/CHANNEL 2

The XLR input for MIC 1 can be confi gured to be Microphone level or line level. Follow the silk
screening of the unit for proper use of the mic/line switch.

MIC/CHANNEL 2 is a single input channel that can be XLR input (mic or line as described above) or
an RCA input. The RCA input is always line level, the MIC/LINE switch does not effect the RCA input.

Q: When I plug a mic into the RM424 I can barely hear it?
A: The MIC/LINE switch is set to LINE level and you are using a MIC, set the switch to MIC. Make
sure other volumes of the unit are set properly.
Q: Can I use the XLR and RCA input of CH 2 at the same time?
A: Yes, but you will have no way of attenuating the volume of each source separately.

4

Channel 3 and 4 inputs are line level RCA’s.
Q: I only have a single mono RCA to connect to the source inputs do I need to get a “Y” type adapter?
A: No, the RM424 will accept a mono or stereo signal into the RCA inputs, and will convert all signals
to mono. No “Y” adapter is needed.

3

MIC/LINE

T

INPUT LEVEL

MIC

LINE

The MASTER VOLUME controls on the front of the RM424 function just as the name implies.
NOTE: with channel volumes, master volumes and possibly remote volumes there are plenty of op­portunities to get distortion on the outputs. It is best to set all volumes at half (white pointer facing up).
Then make adjustments from there as needed.

Q: When using a remote volume does the MASTER VOLUME control still work?
A: Yes, when using a remote volume both the remote volume and master volumes are active. We
suggest if you are using a remote volume to set the master volume to 10 (all the way up) to give the
remote volume access to the full volume potential of the RM424.

MONITOR

HEADPHONE

The MONITOR section of the RM424 is designed to be able to monitor a signal before it is sent to a
zone.
EX: If you are going to send audio from a music player connected to input 3 to zone 4 output, but you
want to be sure the sound is correct you can preview (monitor) it before sending it to zone 4 output.
By selecting MONITOR on the input 3 section of the front panel, you can either listen to the signal
from the speaker on the front panel or plug in headphones to MONITOR the signal before you select
input 3 to be sent out to zone 4 output. This can be done in any combination of channels etc. The Vol­ume level for the monitor is for either the headphones or the speaker. When headphones are plugged
in to the headphone monitor jack the speaker is disabled allowing you to monitor quietly.
Q: The monitor works with source signals but seems to be low with mic’s?
A: The unit is working fi ne, the problem is that the small speaker on the front of the RM424 is sending
out a signal to monitor the mic, but the mic is lower in volume than the line level signals. We recom­mend using the headphone output to monitor sensitive information.

Page 1

Page 6