Amps are amps if properly designed and working within their design parameters. I get as fed up of typing that as I am sure others do of reading it, but the point never seems to get across fully. You are right when you say of the other amps that none was better than the Emotiva, given that Emotiva amps are well designed.
Emotiva amps do not 'cause' sibilance. End of. If someone has sibilance in his system it means that a frequency band of 5-6 KHz is being emphasised for some reason (I am assuming tweeters are not broken etc). If you look at the FR plots for the Emo amps there is no such emphasis, so the Emo amps simply cannot be responsible for it. Anyone suffering from this problem needs to look elsewhere to find the source of the sibilance and fix it. Also some people are especially sensitive to sibilance and 'go looking' for it. Sometimes there is natural sibilance on a voice and that needs to be considered too. But whatever causes it, it ain't the Emos.
Probably right. A well treated room can make a $2,000 set of speakers sound like a $20,000 set (in an untreated room). But if you put a $20,000 set of speakers in a bad, untreated room, they will almost always sound like cr&p. And room treatments are really, really cheap if you DIY. By far the biggest ever bang for the buck anyone will ever usually get.
IKWYM. Sibilance is one of those things that, once heard, can result in an almost obsessive desire to go looking (listening) for it. I hope this discussion doesn't prompt people to do that!
I have no idea why 5 people are reporting it. It doesn't seem like a huge number though. There could be various reasons for sibilance but it is very unlikely to be the amp - that's all I am saying. I am not disputing there is sibilance in their systems - but I have examined the results of the measurements of Emo amps and can see no reason to believe they are inducing sibilance.
An improperly designed amp that "rolls off the highs" (amp as tone control) can obviously mask the sibilance. So can using a treble filter. Nobody would dispute that. But the real solution is to find out the cause of the sibilance and fix it.
Nice job! If it is a broadband absorber ("bass trap") they say you can't have too many but I am with you - go steadily and add a few at a time. If you have REW you can use ETCs and waterfalls to help decide where they go. If not, start with any of the 12 corners in the room and add them in a controlled way, listening each time that you make changes.
The amount of current delivered by the amp depends on the load connected to it. This is why a 4 ohm load draws more current than an 8 ohm load (less resistance enables the amp to deliver more current for its rated power). I think you are assuming the amp somehow 'pushes' current to its load but in reality it is the opposite way around - the less resistive the load the more current the amp will deliver - ie the load draws the current required not the other way around.
