Originally Posted by Frohlich
Not sure what amp you have but I just got three M2s with a Crown DCIn 8/600 amp. I had hiss the first couple of days as I was setting everything up but was able to adjust the attenuators on the back of the amp and its all but gone (have to be 1 foot away to hear it...before you could hear it from the seat). Not saying we have the same issue but if you haven't tried that path yet, maybe it will help?
I have the iTech 5000s and my sensitivity is set as high as it'll go from the front-panel adjustments -- I believe it's 4v. I have heard it'll go higher in the web interface, but I don't know if I can go much higher than 4v before I have other issues (e.g., clipping my NAD's output stages trying to drive it). I have found the sensitivity adjustment to make a bigger difference than the gains with regard to the noise I get (like a whine / hiss -- it seems self-generated in the amps), but I also have the gains set fairly low and it does help as well. When I was mucking with the gain/sensitivity, I found some "odd" combinations that would make the music sound...unnatural. Hard to describe, but I landed on where I am with a bit of experimentation and trading noise for the peak level I could produce without clipping the outputs -- maybe I could do better if I gave it more time, but I need to work to pay for this hobby instead, lol, so I rather spend the limited time I have enjoying than tweaking.
That said, I can only hear the hiss from my seats if it's late at night (lower noise level in the house) and I am focused on listening -- and only then during quieter content, but, usually that's precisely when I hate it most, so.... Honestly, it's a nit, but it's the only one I have and...I'm dumb / crazy enough to "need" to fix it, lol. Maybe, with further adjustments, I could improve the situation, but...even if I could, I wouldn't hate getting rid of the extra A->D D->A in the Crowns and having more flexibility in choosing my amplification. Especially since I can get something fan-less and put it in-room on an equipment stand, getting rid all the 60 foot speaker and signal cables running from my storage room to the media area of my basement!
Anyway, I'm pretty much just trying to justify an upgrade strictly to improve signal-path "purity", lol. Everything else is just a bonus. But, since my own personal "ideal" signal-path has always had the AVP doing everything (including active x-over) in the digital domain, with one D->A for amplification, I've been looking at ways to get there for a really long time. Unfortunately, for the, arguably, minimal improvement it brings (to all but my mental happiness about the signal-path being "ideal", lol), I felt it to be cost-prohibitive. So, if this unit can get me there without my wallet taking a $15k+ hit, just for the AVP, which is pretty much what it'd take right now, then I'm much more willing to start opening it up, lol.