RM83T
Eight Channel Mic Mixer
Start Guide
ROLLS CORPORATION
SALT LAKE CITY, UTAH
4/11
pwr
+20
LEVEL TONE LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL
0 10
LEVEL
1
TONE
2
TONE
3
TONE
4
TONE
5
TONE
6
TONE
7
TONE LEVEL
8
MASTER
+20 +20 +20 +20 +20 +20 +20
1/8”
STEREO
INPUT
MADE IN USA
www.rolls.com
RM83T
TRANS BALANCED
MIC MIXER
75889 00830
62
SPECIFICATIONS
Input Impedance: Mic: 600 Ω XLR balanced
1/4": 10K Ω unbalanced
Bus Input: 10K Ω unbalanced
Max Input Level: Mic: +4 dBV balanced
Line: +22 dBV
Input Connectors: 8: XLR, 8: 1/4" (Line), 1: RCA (Bus input)
Outputs: XLR bal., RCA unbalanced Prefade out
Max Gain: Mic: 60 dB
Line: 35 dB
Tone Control: 12 dB Treble/Bass cut
Phantom Power: +48 VDC
Output Level: +22 dBV max
Output Impedance: 51 Ω
Phase Shift: <10 degrees, 20Hz to 20 kHz
Max S/N ratio: 106 dB
THD: <.01%
CMRR: >120 dB (Mic)
Size: 19" x 1.75" x 6"
(48.3 x 4.5 x 15 cm)
Weight: 6 lbs.
DIP SWITCH DEFAULT SETTING: ALL OFF
JUMPER DEFAULT SETTING: 1/4” JACKS AS INPUT
OPERATION
CONFIGURING THE 1/4” INPUT JACKS AS DIRECT OUTPUTS
The eight 1/4” Input jacks come from the factory con gured as line inputs and
are electrically mixed with the XLR jacks. They may be used together if desired.
To con gure a channel’s 1/4” jack as a Direct Out,  rst remove the RM83T lid.
For each channel there are dual three-pin headers with shorting jumper on two
pins. The setting from the factory is on “IN”. By moving the shorting jumpers to
the con guration shown as “OUT” (one jumper up, the other down), the jack then
becomes a Direct Output.
CONFIGURING THE 1/4” INPUT JACKS AS INSERTS
To con gure a channel’s 1/4” jack as an Insert,  rst remove the RM83T lid and
locate the corresponding channel’s dual three-pin header. Move both shorting
jumpers down as shown below as “INSRT”, the jack then becomes an Insert.
Direct
Output
Insert Input
CONFIGURING THE OUTPUT FOR MIC OR LINE LEVEL
The RM83T ships from the factory with the XLR Main Output con gured as Line
Level (+4 dB). To change this to Mic Level (-10 dB), carefully remove the lid,
locate the Mic/Line header which is near the Main Output jack. Move the two
jumpers from the Line Level position (shown below on the right), to the Mic Level
position (shown on the left).
Mic
Level
Line
Level
JUMPER DEFAULTS
The internal jumpers are confi gured from the factory as follows:
1/4” = INPUTS
MAIN OUT LEVEL = LINE LEVEL