Nuforce STA200

RV said to listen for extra brightness when bi-amped.  I had time, so I compared and found no additional brightness.  I didn’t want to go through the hassle of returning one of them.  I really like the sound staging and imaging from the amps.  Bass seems a little lean, but it’s fast and articulate.  Hopefully the amps will bloom a little more after breaking in.  I’m using a brand new Parasound P7 all analog preamp with it, so maybe that needs some break in time too.  New power cords too.  I’m incredibly impressed with how dead quiet the amps are, however.

I encourage you to leave everything on, 24 / 7, with music playing through the system. It will take, ime, a few hundred hours, for them ( the preamp, too ), for things to gel ( lean bass, as an example ). They should be better, in sq, over the Rotels, in every area, but with a new preamp, you might not attribute all of these changes to the amps themselves.......And yes, they are very quiet....Anyone who experienced them to be noisy, was experiencing the high gain of them, amplifying noise earlier on, in the signal chain. Thank you for the feedback.....Enjoy ! MrD.

Has anyone used this amp with JBL Studio 530 speakers (86 dB, 6 ohms) ?

Ooh, I'd like to know this as well.  I love the 530s

I bought a STA200 and have about 5 hours of listening into it. Using on 86db/6ohm speakers and coming from a well respected chip amp. First thing I noticed was the impact this amp has at higher volumes.Very dynamic and lively -  it is meant to be played loud!  However, highs are a bit strident / grainy and bass/mid-bass is a little too exaggerated and loose (on my speakers).  I have a feeling the 60hz-200hz range is somehow accentuated on this amp.  These faults are easily overlooked when the volume turns up and you start "feeling" the music. It's dynamics & speed are addictive.  I wonder how much improvement could be had with a 2nd unit in a vertical bi-amp set-up...my rational self thinks it may not be worth it for a 10% subjective improvement in performance.  I will continue to listen for improvement as the amp breaks in.