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Rolls MS20C Splitter/Combiner/Isolator

BH #ROMS20C • MFR #MS20C
5 reviews
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Rolls MS20C Splitter/Combiner/Isolator
Key Features
  • Split One XLR Signal into Two
  • Combine Two XLR Signals into One
  • Isolate Balanced Line from Buzz or Hum
  • Inputs: 2 Balanced XLR, 3.5mm TRS
The Rolls MS20c Splitter/Combiner/Isolator can be used to split a single balanced XLR input (or 3.5mm TRS input) into two balanced XLR outputs. It can also be used to combine two balanced XLR inputs into a single XLR output, or to simply isolate a balanced line for buzz or hum elimination. There is also a ground-lift switch for additional noise elimination. Note that when combining two condenser microphones, phantom power voltage is passed to only one of the microphones due to the internal isolation transformer.
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Rolls MS20C Overview

The Rolls MS20c Splitter/Combiner/Isolator can be used to split a single balanced XLR input (or 3.5mm TRS input) into two balanced XLR outputs. It can also be used to combine two balanced XLR inputs into a single XLR output, or to simply isolate a balanced line for buzz or hum elimination. There is also a ground-lift switch for additional noise elimination. Note that when combining two condenser microphones, phantom power voltage is passed to only one of the microphones due to the internal isolation transformer.

Splitter
A single balanced XLR signal can be split into two isolated signals.
Combiner
Two balanced XLR signals can be combined into a single.
Isolator
A single balanced line can be isolated to eliminate buzzes and hums.
Ground Lift Switch
Switch when in "GROUND" position, indicates that pins 1 of the INPUT and OUTPUT jacks are connected. In the "LIFT" position, the ground pins have been separated.
UPC: 675889000207

Rolls MS20C Specs

General
Compatibility
Not Specified by Manufacturer
Inputs/Outputs
2 x XLR 3-Pin Inputs
1 x 1/8" / 3.5 mm Input
2 x XLR 3-Pin Outputs
Input Impedance
XLR: 600 Ohms
1/8" / 3.5 mm: 10 Kilohms
Output Impedance
600 Ohms
Frequency Response
35 Hz to 20 kHz
Maximum Input Level
+26 dBm
Physical
Color
Black
Material of Construction
Metal
Dimensions
3 x 2.25 x 1.2" / 76.2 x 57.15 x 30.5 mm
Weight
10 oz / 284 g
Packaging Info
Package Weight
0.64 lb
Box Dimensions (LxWxH)
8.25 x 5.15 x 2.4"

Rolls MS20C Reviews

MULTIPLE FAULTY UNITS IN SUPPLY CHAIN

By Brad
Rated 1 out of 5
Date: 2025-04-28

I purchased and returned a unit that was summing a stereo signal to mono with one side 8db lower than the other. The replacement unit does the exact same thing. To make sure that I wasn't being an idiot, I did extensive testing, taking exact measurements and swapping cables, etc. to ensure it's definitely the unit. It is. I can not recommend this unit for that reason. I've reached out directly to Rolls and made my test files available to them.

A solid performer

By Greg
Rated 5 out of 5
Date: 2015-04-12

I use these to split my mics between a monitor mixer and the front of house mixer. These small boxes are made in the USA and built like a tank. They do their job well without coloring the sound and also double as a mic combiner in those situations when you have run out of mic channels on the board. I have a few Rolls boxes in my toolkit and they are solid and dependable little problem solvers.

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