Experience with ATC 20A-2 Active speakers?

i have experience with the ATC SCM-50A, SCM-12, SCM-7, and SCM-10A and both of the ATC preamps.

firstly, the ATC speakers all sound nearly identical, the only real differences are in bass extension. the 20s use the same driver as the 50s, which is, IMO, the greatest mid-range driver ever. if you get these speakers, look into the tweeter upgrade (if they don't have the new tweeter). i've not yet heard the new tweeter, but all accounts say it is far superior to the older one, which some viewed as the only nit-pickable flaw to them.

as far as the preamps go, neither impart *any* sonic signature to the sound at all - they are stunningly transparent. my brother uses the smaller one for his 50s and i use the larger one for mine. we've done comparisons before and the difference is in detail. the larger one simply allows more music to come through, but the smaller one is exceptional at the price.

for the size of your room, the 20s are likely an excellent choice. please feel free to ask any other questions you may have.

I have NO experience w/ the 20 but do have experience w/ 50 & 100. In that light, I can confirm Lazarus' quick assessment above -- except of course the compression at VERY high (unnecessarily high IMO) volumes that settles in w/ the 50 whereas was unoticeable with the bigger model.

The 75-150 midrange driver is, of course, one of the best upper mids in production. I don't know which tweet they use (vifa in the older models?) but it shouldn't be difficult to find out -- and upgrade if you feel necessary.

I beg to differ slightly re, the pre: the bigger model was extended & detailed, the smaller one seemed less so -- both being somewhat limiting where details were concerned. I listened with an attenuator as a reference, so my comments ALSO reflect the addition of an extra circuit in the chain -- Lazarus is living with the pre, so is more experienced.

Oh yes, the sound: to be short, excellent.

I'm using the ATC active 20-2's (purchased from can hi-fi 2 months ago) in a 13 1/2' wide x 30' long x 8'high w / 3 openings @ the side to other rooms.
I'm using a Dodson dac connected to a Bent Audio pre (silver transformers). All balanced connections.
The sound is marvelous; room filling everywhere. Actual spl's can be over 95 db in the rear of the room w/o distortion.
I'm not using a sub yet, no real need to. If I ever get another speaker, it would be a larger ATC active.