Rolls MB15b Promatch 2-Way Stereo Converter

Rolls MB15b Promatch 2-Way Stereo Converter

Rolls MB15b Promatch 2-Way Stereo Converter

B&H # ROMB15B MFR # MB15B
Rolls MB15b Promatch 2-Way Stereo Converter

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Product Highlights

  • XLR and RCA Connectors
  • 3.5mm Input
  • Line Level Control

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Rolls MB15b overview

  • 1Description

The Rolls MB15b ProMatch is an inexpensive line level audio device that converts consumer level stereo RCA signals to balanced XLR professional line level signals, and vice versa. The unit is useful for video duplication and audio recording studio applications; for example, connecting a consumer VCR to a professional video deck, or an off-the-shelf CD player to a professional mixing console or recorder.

The MB15b ProMatch has 2 XLR inputs and stereo RCA outputs on one side, labeled 1, and stereo RCA inputs and 2 XLR outputs on the other side, labeled 2. Each side has stereo level controls, and an LED indicates that power is applied to the unit.

Additionally, the unit functions as a balanced XLR line level control. By adding a stereo pair of jumper cables between the 4 RCA jacks (connecting ins to outs), the level controls may be inserted into any balanced XLR line.

Bidirectional line level audio signal converter and stereo direct box converts from consumer to professional and professional to consumer levels
Allows for connection of consumer level products such as camcorders, CD and cassette players to professional level recorders, mixing consoles and signal processors
Standard stereo XLR and RCA connectors, dedicated stereo level control knobs for inputs and outputs
Double duty functionality as balanced inline level control, achieved by patching RCA inputs and outputs together
UPC: 675889000153
In the Box
Rolls MB15b Promatch 2-Way Stereo Converter
  • Power Supply
  • Owner's Manual
  • 1-Year Limited Warranty
  • Table of Contents
    • 1Description

    Rolls MB15b specs

    Maximum Input Level Balanced: +22 dB
    Unbalanced: +22 dB
    Maximum Output Level Balanced: +18 dB
    Unbalanced: +12 dB
    Input Connectors 2 x 3-pin XLR Female, Balanced
    2 x RCA Phono, Unbalanced
    Output Connectors 2 x 3-pin XLR Male, Balanced
    2 x RCA Phono, Unbalanced
    Input Impedance XLR: 10 kOhms
    RCA: 100 kOhms
    Output Impedance XLR: 100 Ohms, Balanced
    RCA: 100 Ohms
    Dimensions 4.15" x 2.5 x 1.55" (105 x 64 x 39mm)
    Weight 1 lbs (454g)
    Packaging Info
    Package Weight 1.2 lb
    Box Dimensions (LxWxH) 6.9 x 4.7 x 2.6"

    Rolls MB15b reviews

    MB15b Promatch 2-Way Stereo Converter is rated 4.9 out of 5 by 24.
    Rated 5 out of 5 by from Multibox magic Great gadget for ENG videographers using HDV camcorders. We use it to connect to sat trucks and multi boxes in news-pool situations. The outputs are almost always +4 dbu professional line level, and the HDV camcorders are all consumer, -10dBv line inputs. This inexpensive but capable gadget does the conversion and provides attenuation or amplification as needed. It is bi-directional, so we can feed takes from a camcorder direct to the sat truck inputs, or receive from them. Neat, compact, inexpensive. Great gadget. Expertise: Multimedia producer for newspaper website Previous Equivalent Item Owned: Various passive attenuators Items I Recommend: XLR and RCA cables, headphones
    Date published: 2007-11-21
    Rated 5 out of 5 by from Perfect for home theater -> Pro amp I have a home theater where 3 of the seats have Buttkicker tactile transducers, for those earth quaking explosions etc. Tactile transducers require a lot of wattage from your amp, so a pro amp suited me best (lots of power, drive low ohms, cheaper per watt). However, since my home theater receiver only had the typical -10 dB output on the sub-woofer channel, I needed something to bring it up to the +4 dB required by the professional amp. This box is an affordable way to integrate professional audio equipment into your home theater. No fuss, just works. Just be careful when you now do the channel balancing, since you'll have three places to adjust the audio level, 1) the receiver, 2) the MB15b Promatch, and 3) the amplifiers input gain.
    Date published: 2011-06-13
    Rated 5 out of 5 by from This is a great product, very versatile I used this unit to provide needed gain and to interface an internet streaming box to a digital signal processor which provides modulation to a mono low power (30 watts) FM transmitter. I needed two independent mono amplifiers so I modified both section 1 and section 2 of the unit. I isolated the two rear gangs of the level 1 and the level 2 controls, from their circuits and modified the wiring so that the level 1 control independently controls one mono amplifier, while the level 2 control still independently controls the other mono amplifier. It would be nice if a switch could be included that would accomplish what I have done, without the need to modify the circuit.
    Date published: 2014-11-11
    Rated 5 out of 5 by from DO NOT leave home without one of these! This will make the 7th MB15 I now have in my kit. This little swiss army knife allows me to work around mis-communications in the planning phase. It is also very handy to deal with low audio levels as this unit is active AND it works wonderfully as a pad.
    Date published: 2008-07-06
    Rated 5 out of 5 by from MB15B PROMATCH I needed something to bring the level up from my yamaha HTR-5830 to my yamaha p3500s.this little device is a must have for any DIY home theater setup if you're using a pa amplifier.highly highly recommend it !! im just glad that companies make such a product to make people like me very happy !!
    Date published: 2012-01-24
    Rated 5 out of 5 by from Solid and stable It is very simple and easy to use. The function is limited, converting the audio signal from Unbalanced to balanced and in the opposite way but It works totally fine my use. The price is very affordable, too.
    Date published: 2009-07-10
    Rated 5 out of 5 by from Professional product for all users Promatch MB 15b, manufactured by Rolls, is a high-quality product that enables connectivity between amateur, mid-level professional, and professional stereo equipment. The unit is a solid performer; it does not introduce hum or distortion when used with high-quality cables. Two units are needed for stereo connectivity.
    Date published: 2012-05-13
    Rated 4 out of 5 by from Permitted me to run 100' XLR cable for lower noise Still have some noise but way less than with RCA cables. Sony HDD bush resolution audio player connected to receiver 100' away (by cable run). The Sony HDD has both RCA and XLR outputs but the mid-range receiver (second system being fed) had only RCA inputs. This little box allowed XLR cables for both R and L channels. Did not affect apparent sound quality and DID reduce 60 cycle hum by about 50% compared to RCA cables....
    Date published: 2018-10-22
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