Originally Posted by expresso712
i am just curious to hear from others who know more than i do - seems like everyone here only talks about Crown -
is QSC that bad ?? that no one here likes them
QSC amps are just fine as amplifiers, but are generally very much oriented towards pro audio. This is to say that high efficiency, small size, lots of power, and the ability to survive tough condtions are priorities.
I don't know if QSC have even one amp in their current line that lacks a colling fan - which is pretty much anathema for home use. There used to be the convection-free USA 400 and I have several.
The fan thing becomes clear when you realize that the USA-900 is the same sized box and heatsinks but with a fan. It puts out about 3 times as much power if memory serves.
Crown and QSC match or outperform the majority of audiophile amps when it comes to things like low distortion and electrical noise. They walk away when it comes to driving tough loads.
For example, QSCs clipping indicators start flashing when you clip enough to cause about 0.03% THD if memory serves. That's actually pretty gutsy on QSC's part, as they are implicitly saying that if the amp has more than about 1/3 the absolute least distortion that can be heard under the most ideal conditions for hearing distortion, their amp is basically running broke and you should turn it down. The amps are *that* clean.
Crown isn't really that much different in their approach. Either company are the go-to guys when you want tons of reliable power in a small package that sounds good.
What's interesting about Crown is that their chief engineer is obviously trying to patent and produce more different output stage configuations than any living human. AFAIK he's miles ahead of his nearest competition but that hasn't slowed him down. In contrast QSC has stuck with pretty much the same basic one. It all works.
Both company's amps are equipment that most golden-ear audiophiles love to hate. However, on the test bench and in proper listening tests they are geneally faultless, other than the fact that their equipment pretty much unversally has cooling fans. So you put it in a closet or the next room.
QSC amps generally use a unique output stage layout that features power transistors with their cases connected to ground, thus elminating the need for mica or other kinds of insulators. They've zipped this up to include other golden-eared audiophile anathemas - stepped power supplies and switchmode power supplies.
Either way, with Crown or QSC you get tons of clean power and durability for not a lot of bucks. But, it is industrial-strength gear with an industrial look. If techno is your thing, you'll be overjoyed. Neutral on the WAF scale.
I find it interesting that when those world-class copycats Behringer, decided to clone power amps, they basically copied QSC and in some cases quite exactly, right down to the pin numbers on the circuit cards. They had a lot of potential competitors to copy but they picked QSC. They say that copying is the sincerist form of flattery, and that may be right.