****** - Verified Buyer
4.5
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).
