Originally Posted by dirtyharriett
Ken, I was told to Bi-amp the LCR's by Bill Matthews at Tri-State. The reason I wanted to go with the QSC RMX series is two fold. First they are the most common to find used or refurbished and secondly years ago when I tried to go to the digital amps for weight purposes in my PA system I didn't think they performed nearly as well as my old school QSC's. Times my have changed... it just seems I can get the most bang for my buck going the RMX route. I couldn't even find a place that sells QSC's new cinema amps. Finding them used or refurbished would probably be next to impossible. I'm sure I would end up spending almost 2-3 times as much as I will buying the used/refurbished RMX's (I have a GREAT local source that is giving me awesome prices). If anyboby knows for sure that the RMX's will sound like crap in this system for gods sake please speak now!!!
I've never talked with Bill other than a friendly hi how are you when I stop in at the shop...I usually deal with Fred at Tri-State. They're all nice folks though.
Are you sure what Bill meant was two amps per speaker? Running a single amp with the lows on one channel and the highs on the other is considered bi-amping also. Not bridging would also get a bit cleaner sound out of the amp as distortion levels usually go a bit when you start bridging.
Here's a diagram from Crown/JBL showing a medium sized bi-amped cinema system.
Just keep in mind the mains they show are actually three-ways that use a passive x-over between the mids and the tweets.
Even if you wanted to do two amps per speaker, you can run a much smaller(cheaper) amp for the horns as you will already be attenuating the horns so much anyway to bring them inline with the bass section. The horns just don't need very many watts even during LOUD scenes at reference levels and beyond.
RMX's are nice amps don't get me wrong and lots and lots of people run them. If those are what you can get a good deal on then by all means run them.
The biggest knock I hear on the RMX line is fan noise(you've got that covered).
I listed my amps in an above post and I have both newer switching and traditional non-switching QSC designs. I've found that the bass is indeed stronger and tighter with my traditional transformer equipped amps like my MX2000a. Not to offend anyone but they just seem to have more balls down low.
I do think that the modern QSC switching designs do slightly better on the horns though as they seem a bit cleaner sounding. It's probably not enough of an improvement to warrant paying a large premium in cost over the RMX's though.