I currently have on dem the ATC SCM100 passive speakers, and huge buggers they are too ! I was very impressed with a demo I heard at Acoustica the other week, (they were the active version), so I asked to hear them at home. Having a NAP500, the opinion was that passive + 500 would be better than active, so passive they are... for now. I've asked to hear the active version after deming the passives for a week or so... but more later.
I've been listening to these ATC100's without attempting any comparison... up to now! But today I moved my Diamond 802 D2's into place and swapped back to these. There's much more comparing to be done but SWMBO has comandeered the living room once again, so serious listening is postponed until tomorrow, BUT my very first impressions are that the 802's would be my preferred choice.
The bass of the ATC 100's is undoubtedly louder than the 802's but it seems a little overpowering. The 802's allow more of the music to flow through, I'm hearing. The 802's are 'brighter' than the ATC100's - the bass is much less intrusive and the detail in the music just seems to flow naturally (even though ATC are sopposedly mixing desk quality speakers).
Now, being a once Scottish manufacturer lover, and used to the 'single speaker' demo rule, I have to admit there are nine other speakers in the room, but that's the way it is, I'm not kicking out my TV/video system, even though it's totally separate from my Naim Stereo system, so the stereo system has to perform within these parameters...
I'll report back when I've had the opportunity to listen to a wider variety of my favourite music (60's, 70's POP and MOR stuff with the odd bit of Vivaldi & Mozart, but only the odd bit!!)