adcom equipment.....

I would beg to differ with hifiman's assertion that he's read up on the new Adcom lines.  There is almost nothing to read up on regarding them or at least their design.  One can read the manual of each model on line, or read up on a few owner's impressions here and there, but there is no analysis of new vs old design, spec, sound, etc. that I can find anywhere.

That said, I bought the 555SE a year ago and the 6002 a few months back.  The 555 is a gem for the money.  Clear, open, dynamic but not bright or harsh sounding, or at least with decent cabling.  Great soundstage too.  I may actually be holding it back somewhat with the preamp, a P5 from Parasound.  it's a decent pre but employs mostly op amps instead of the preferred discrete circuitry.  Still, I have been able to get a soundstage with depth at times, 

The 6002 is a budget amp and though not the equal of the 555, has lots of power for its size.  It actually has more features than the 555SE, which may be due to the 555's minimalist design with no 12 volt trigger or input gain knobs.

As to the OP's curiousity towards the 575SE, I'd be curious too.  At 81 lbs, I'd suggest it's not for the faint of heart!  The 565 intrigues me too at their sale prices, but I've got to lay off the amp upgrades for a while.

Sure, no problem.  Being that I've owned both Parasound and Adcom previously, I compared some of the specs of the 555SE and the Parasound 2250 V2.  They retail for about the same...

The Adcom has comparable SNR and better damping factor(900 to 150), better THD and better frequency response, which is down to 10 Hz vs a -3 db of 20 Hz for the Parasound.  The 555 also doesn't need a 2 ohm switch to be stable at 2 ohms.  I can't find cap values for the 2250, but comparing photos, the Adcom's at 60,000 micro farads seem quite large compared to the Parasound.

One more thing.  The 2250 achieves unity power at 1 volt, which is the typical max voltage output for receivers, but not preamps.  The Adcom achieves full power at 1.75 volts, which would give more range on the volume dial.

To be fair, the Parasound has more features, consumes less power at rest, and has 275 wpc on tap vs the 200 wpc for the 555.  The new improved Halo amps look much better for more money, though.

That's an interesting result, the harshness I mean.  I found it not harsh with Totem Rainmakers( a somewhat forward/open sounding speaker), but perhaps the Halo P5 had something to say about that.  Then too, my definition of harsh may be different than yours.  My cabling differs too, but let's not get into that!

I suppose it is a budget amp after all, you can only get so much SQ at the price point.  

It's a couple of weeks later, and I've sold a few things and acquired a pair of Totem Hawks, as I've mentioned elsewhere on this forum.  I bring it up here because I've currently got the 6002 driving them, and it seems to be doing fine which somewhat surprises me.

The Hawks are apparently a difficult load, and I had the 555SE running them, but was concerned about the driver movement at higher volumes so swapped in the 6002.  It's a fun little amp, though not quite the equal of the 555 SQ wise.  Love the Hawks, btw, I'm going to sell the Rainmakers.