Rolls MB15b


Rolls MB15b ProMatch Balanced/Unbalanced Converter 3.5mm/RCA/XLR

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Rolls MB15b ProMatch Balanced/Unbalanced Converter 3.5mm/RCA/XLR

One side of the MB15b (labeled 1) has two XLR inputs and stereo RCA outputs. The other side (labeled 2) has stereo RCA inputs and two XLR outputs. Each side has a stereo level control, and an LED indicates that power is applied to the unit. An additional benefit of the MB15b is that it will act as a balanced XLR line level control. By adding a stereo pair jumper between the four RCA jacks (connecting ins to outs), the two level controls may be inserted into any balanced XLR line. AC power adapter included. Made in the USA.

For more than two decades, those in the know have turned to Rolls for the highest quality, reliability, and value. Rolls is an innovative company specializing in domestically manufactured signal interface accessories, mixers, amplifiers, and processors for the audio professional.

Specifications: • Dimensions: • 4.15″ x 2.46″ x 1.55″.




Max Out: Balanced: +18 dB, Unbalanced: +12 dB
Max In: Balanced: +22 dB, Unbalanced: +22 dB
Input Impedance: RCA : 100k Ohm, XLR: 10 k Ohm, 1/8" stereo: 10k Ohm
Output Impedance: RCA: 100 Ohm, XLR: 100 Ohm balanced
Frequency Response 20Hz – 20KHz 0 /-1dB
Noise Floor: -88 dB
Gain: +4 dB In: -8 dB, -10 dB In: + 20 dB
THD: .003%
Power: 9 – 15 VDC adapter (center negative)
Size: 4.15" x 2.46" x 1.55"
Weight: 1 lbs. (.45 Kg)
Current drain 16ma nominal no load 15vdc
Stereo Direct Box
Stereo RCA to stereo XLR
Stereo Level control for each channel
Works as stereo balanced line level control
1/8" Headphone level to line level adaptor


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