5 out of 5
Pricing Note
Product Description
Manufacturer Part Number: MB15b
The MB15b ProMatch is a veritable Swiss army knife for the audio pro or enthusiast. It converts consumer level stereo RCA signals to balanced XLR professional line level, and back.
Key Features:
Overview:
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".
Specification:
Manuals & Resources:
The MB15b ProMatch is a veritable Swiss army knife for the audio pro or enthusiast. It converts consumer level stereo RCA signals to balanced XLR professional line level, and back.
Key Features:
- Stereo direct box
- L + R RCA to L + R XLR
- Stereo level control for each channel
- Works as stereo balanced line level control
- 1/8" headphone level to line level adapter
Overview:
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".
Specification:
Product Details | |
|---|---|
| Brand | Rolls |
| Model | MB15b |
| Part Number | 245-1062 |
| UPC | 675889001501 |
| Unit of Measure | Each |
| Weight | 1.2 |
Product Specifications | |
|---|---|
| Mixer Type | Analog |
| XLR Mic Inputs | < 6 |
Manuals & Resources:
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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Customer Reviews
By -K-
Date: February 16, 2024
The ROLLS MB15b PROMATCH works well. The product is built well. The Power plug going into the Rolls Promatch connects well, holds in there tight. - - - - - - - - I'm using this with RCA 'LFE .1' connection (From preamp/receiver) - to the promatch - to - Balanced connection on sub. - - - - - - - - Besides that, - My setup personally, I had issue getting my sub to turn on properly or stay on at lower volume or bass amount. - I'm sure it's not the sub, but The solution for me is to Turn the level on the sub itself down a bit (6db to 0db or a bit lower(MONOLITH M-10 V2 SUB)) and adjust the level on the ROLLS MB15b accordingly to what you need to make it work properly. It's Something to do with the auto on/off feature that I want / need to use. - At higher volume there is no issues seeing it's a lot more signal, so I Could essentially go ' 6dB ' on the sub level itself, and whatever level on the ROLLS MB15b, but for me in this room it's not about turning it up to 11 all the time, I want Balance in my room with the Bass and the speakers the room. .. amp; be able to have audio at lower volume without losing the signal to my sub... I hope this info helps anyone having any issue or problem getting their sub to work with the ROLLS MB15b. Additionally - I'm currently keeping the level on my ROLLS MB15b between 11 - 1 o'clock 'turn' .. depending on what I want at that time, and/or what I'm listening to, it's simple and works. In my Current situation / setup I Don't think I will need or want to turn the level up a lot more, as it will be off balance with the setup/speakers.. And just be too much. Great Product! :) Good Luck with your setup.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Mandy
Date: January 29, 2024
Great quality, nice heavy knobs and boost my signal from my home theater reciever to my dj amp perfectly. Power cable feels cheap compared to the box but ah well
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Kevin
Date: December 21, 2023
This device will allow you to interface your audio signals between devices that normally would not interface.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Super Bubba
Date: November 27, 2023
I built a 1000 watt dyi amp for a large RBH Sound twin 12. I had an issue with ground loop on the rca when connecting direct. I also needed more voltage to drive the amp to max output. I put this device in line with the preamp sun out and the new amp. I used the balanced out into my amp. There’s also a volume control that allowed prcis tuning to my 7.0 system. Sub is beautiful, 17Hz-400 hz with zero noise. Never been happier.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By dray ingram
Date: October 05, 2023
Quality
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Sammy
Date: September 13, 2023
Do you record with any gear that has RCA I/Os? Then this is what you need. Stop researching. Don't worry about the features. It has all of them. It does what it needs to do and helps you do what you need to do. Reel to reel? Rolls Promatch. Consumer reverb unit from the 70s? Rolls Promatch. Turn tables? Rolls Promatch. Don't just buy one. Buy one for each piece of gear that needs it and consider it a singular unit from here on out.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]