ROLLS MB15b Promatch and More

I have two subwoofers in the theater room with balanced cables to them in the wall. The equipment rack has audio processor with XLR output as well but I want to use miniDSP which has only RCA connections. So I'm using ROLLS MB15b Promatch to convert XLR input from processor to RCA, feed it into miniDSP and its two RCA outputs go back to ROLLS which converts those back to balanced outputs sent over cables to the subwoofers.

This is being used in our computer audio 2.1 setup. (1) pair of wall mounted NHT Superzeros, (1) Denon AVR 1907 connected with optical to our computers output, (1) Rolls Promatch MB15B (been using it for a year or two already), (1) Crown XLS2000, (1) Infinity 1262W in a 4.6cu ft vented box we built tuned with an F3 approx 21hz.The Rolls Promatch doesnt appear to add any distortion or hiss or feedback and most importantly it solved our issue of low output. Sound quality of the Rolls Promatch? To my ears it does not alter the sound in anyway. No distortion, no hiss, no feedback. It is a well designed piece of gear.Using a Crown XLS2000 to power a single 12" Infinity Subwoofer in a 4.6cu ft vented box we made. Before the Rolls Promatch, I had to turn the Crown gain up all the way to get substandard output from the subwoofer. After reading recommendations that said to get one of these... I ordered one. Let me tell you something, this Rolls Promatch brought our subwoofer to life!!!! Connected an RCA from the Subwoofer preout on the Denon AVR 1907 to the input on the Rolls Promatch. Connected an XLR cable from the Rolls to the Crown XLS input. BOOOM!! Now we keep the Crown gain at about 2 oclock. Sometimes we have to turn the Rolls Promatch down because the subwoofers output overwhelms the audio coming from the pair of NHT Superzeros.If you are mixing consumer audio receivers with pro audio amplifiers you should invest in one of these. Even the newer pro amps that claim to have a switch, to switch between pro audio or consumer input voltage, dont work as well from the reviews I read.You have a regular home audio/video receiver and you are using a pro audio amplifier? Get one of these if you want to use that power you paid for, otherwise the amp is barely putting out any watts because the input signal to the amp is too low.Side note, if you are like me and you have a 2000 watt amplifier connected to a $60 subwoofer that only handles 300ish watts, dont turn it up too loud playing extended bass notes because the voice coil will start to smoke. I was a car audio bass competitor 20 years ago. I have just a little experience with overheating voice coils (playing extended bass notes at the transfer function of the vehicle +10hz after loaded with pressure, for the SPL meter light tree :) I did hit 154.4 db though with 1400ish watts RMS with (2) Crossfire entry level 15"s in a 10cu ft vented box (play more than a few seconds and they would blow).

Este aparato es lo que todo productor de audio para video necesita. Todos usan cables convertidores entre equipo profesional y equipo casero y terminan con audio de mala calidad. Yo lo uso para mandar la señal de mezcladoras directo a un switcher de video, laptops u otros equipos que no cuentan con entrada de audio profesional, específicamente para hacer streaming y me resulta excelente.

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. .. & 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.

a must if you want loud shaking sound to hook up your Crown xls amps, works great, just need xls m/f cables and rca cables, makes your speakers Rock!,,,,,,,buy one!, only takes awhile to come!