Originally Posted by Venomous
So you're going to sit there and tell me every amp hooked up has absolutely no hissing? Lol, ok
Please re-read my earlier post with an eye to actually understanding it, OK. And then read below.
Yes, a well-optimized system will have no audible noise, even very close to the speaker.
If an amp hisses, something in the system is off. It could be a source upstream of the amp. (Though if it hisses with no sources, that's obviously not an issue.) It could be a wire issue. (Unplug and replug before replacing; also consider routing for both line- and speaker- level connections. It could be an equipment matching issue. It could be a problem with the design or build of the amp.
With Emotiva amps, I suspect the culprit more often than not is upstream equipment-amp-speaker matching. They have very low input sensitivity* - and quite a high gain. So any upstream noise will be amplified as if it were signal (and signal levels will be low), and higher gain is generally speaking going to be noisier than lower gain.
The Emo amps seem like excellent product, especially considering the prices. I've heard them twice, once on a lowish-efficiency system (low noise, worked great) and once on my 96dB/W/m reference mains (yeah....no; compared to the amps built into a Denon AVR-4308ci I had no sonic advantage once levels were matched, and lots more noise). But one has to understand the design tradeoffs that go into them, just like anything else.
*In one respect, the low input sensitivity is a marketing gimmick: it makes buyers think they "sound better" than other amps, simply because because for a given input they get quite a bit louder than most other amps. However, the low input sensitivity also makes them quite useful to drive active speakers with crossover/EQ handled by a DSP with low output levels, such as the unbalanced miniDSP.