ROLLS RM424 Four Zone Mixer User Guide
- June 3, 2024
- Rolls
Table of Contents
RM424 Four Zone Mixer
User Guide
SPECIFICATIONS
Input Impedance:
Output Impedance:
Max Input Level:
Mic:
Source:
Phantom Power:| 10K Ohms balanced Line
600 Ohms balanced Mic
10K Ohms unbalanced RCA
50 Ohms balanced XLR
-30 dB +22 dB
+48 Volts DC
---|---
Input Connectors:
Outputs:
Max Gain:
S/N Ratio:
THD:
IMD (SMPTE):
CMRR:| XLR and RCA
4 ea. XLR
60 dB mic
30 dB line
75 dB
< .3%
< .3%
Frequency Response:
Power Adapter:
Weight:
Size:| 60 dB
20Hz to 20kHz +/- 0 dB
15VDC 7 lbs (3KG)
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 PROPER SIGNAL LEVEL
SETTINGS. FOR PROPER SETUP AND USE CONTACT YOUR DEALER.
ROLLS CORPORATION
5968 South 350 West
Salt Lake City, UT 84107
Phone 801-263-9053
FAX 801-263-9068
www.rolls.com
INTRODUCTION
INSPECTION
-
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. -
Please visit our web site at www.rolls.com and click on the Register Your Warranty Here button.
The XLR input for MIC 1 can be con 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.
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.
The front panel LEVEL and ZONE switches are the
same for all channels. Simply activate the appropriate switches to send that
channels information to the required output zone.
The output XLR’s 1-4 are line level balanced outputs.
Q: I am getting distortion out of all of the XLR outputs and the level is
very high?
A: You are plugging the line level outputs into something that is MIC level.
You will always get distortion and excessive volume. The RM424 is only
designed to have a LINE LEVEL output not MIC LEVEL. The slotted holes in the
back of the RM424 are for the attachment of a wire tie (included on the PS27s
cord) or a small zip tie (not included), for power cord strain relief as
needed. Just thread the tie thru the holes and attach the cord.
The remote volume section on the back of the
RM424 is designed to enable the installer the ability to install remote volume
controls for the various zones of the RM424. Follow the silk screening of the
unit for exact channel information.
OPERATION AND SET UP
DIP SWITCH SETTINGS
– PHANTOM POWER: This applies 48 volts phantom power to the indicated
microphone.
– Talk Over Zone Assignment 1: When in the ON position, all program material
on ZONE 1 will be “ducked” or muted when signal is present on MICROPHONE 1 or
MICROPHONE 2. This function is used for paging.
– Talk Over Zone Assignment 2,3 and 4 are the same as above.
TALK OVER:
The talk over is designed to allow both mic 1 or mic/line 2 inputs to talk
over the other inputs (3 and 4).
EX: If the talk over assignment is engaged for CH.1 output then when ever
signal is present on either mic 1 input or mic/line CH 2 inputs those signals
will talk over channel 3 or 4 inputs. Keep in mind that these channels need to
be selected to the same output section from the front panel for this to
function properly.
The designation on the rear of the RM424 is for engaging/selecting the
talkover for one of the four output channels. You can have the RM424 talk over
function only on the output channels you select from the rear of the unit, as
pictured above.
Q: Will mic 1 talk over mic 2?
A: No, both mic 1 and mic 2 will talk over inputs 3 and 4, but not each other.
Q: I can not get the TALK OVER to function?
A: In addition to having everything selected properly make sure you have
enough signal present on the Mic inputs to activate the Talk Over circuit. If
the signal to those channels is to low it will not activate the circuit. To
try and remedy this turn the level of the mics/inputs up.
Q: Channel 2 has a Mic and an RCA input will both of these inputs talk
over?
A: Yes, both the XLR and
RCA inputs on CH 2 are connected to the talk over circuit, and will talk over
CH 3 and 4.
PHANTOM POWER:
The RM424 provides 48 volts of phantom power to the selected channel (Mic 1 or
Mic 2). These are selected independently of each other from the rear panel of
the unit, see above illustration.
Q: I cannot hear my mic it is not a phantom power (condenser) type mic.
Does it matter that I have the phantom power turned on?
A: Yes, it does matter. If you are using a dynamic mic (one that does not
require phantom power), you must have the phantom power turned off. When the
phantom power is on it will not allow you to hear the mic. It also may damage
the RM424, or your mic, to have the phantom power engaged when using a dynamic
mic.
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.
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 fine, 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.
OPERATION AND SET UP
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.
ROLLS CORPORATION
SALT LAKE CITY, UTAH