Thanks, vinod david, I am sure it can be improved!
The demo: I had two. One was passive classic 50s + CD + ATC amps vs active 50s + the same CD, in a hifhi show environment. The second demo was atc active classic 100s with MacMini and Benchmark hdr, with my own music and at a dealer.
50 passive vs 50 active:
My impressions were that both sounded good. The first difference I noticed was in the bass - the passive ones compared to actives felt a little boomier or deeper. Actives had no boom in the base and I even felt they sounded thinner. The mids and highs we good on both with actives being slightly better. Overall - the difference was not night and day but was noticeable.
100s
First impression was not related to sound but size. Huge. I am not sure I can or even should fit these into the flat. Re sound: Excellent. Very dynamic. Metal instruments sound like metal instruments, wooden are like wooden etc. Very clear and transparent. A thought that crossed my mind was they sounded like speakers I heard at concerts. Strong and sharp, rather than just loud. One thing puzzled me and it was the bass. I thought it was not there and asked - are they out of phase or smth? They were in phase. But there was very little weight in the drums and bass lines. At least where I used to get weight. I use a sub so it could be that I am used to whatever is the sound I have. Although I do try to be subtle with the sub, I thought. Then I played a track with very low organ notes and at those the speakers rattled the room, effortlessly. Good clean low organ notes. So they do do low bass and do it well, but it sounded like there was a clear lack of bass maybe in the 40-60hz range, like it is filtered out. This was my impression and that was nothing that I expected. I tried them at 0, +3 and +6 bass setting and although the bass did lift a bit, basically the behavior was the same. I do not know what that was - the speaker or the room response or me being used to subwoofer sound. I will explore this further.
Overall, very impressed with the 100s. Big, dynamic, clear, effortless sound.
Also I noted that they run quite hot (the radiators at the back), playing or not so looks like they do not enter a standby mode and need to be switched off. --- EDIT following the visit to ATC: the newer models run much cooler as they now have less bias current, apparently without significant increase in distorsion. EDIT 2: That was for the speakers I saw at ATC, but my pair runs very hot... go figure...
Next step.. Hold your breath..(this is where dramatic music plays in the background
). The ultimate test..Home demo of BOTH 50s and 100s active towers! And I keep one pair! Watch this space.
p.s. I have no idea where to put 6 speakers (2 of which are big and 2 huge) + 4 even bigger boxes that the 4 will arrive in! That is a lot of room-damping material!
p.p.s Any suggestions for an appropriate sub to join the demo???