Krell KAV-250a/3 or KAV-500?

I would go with more power then. The Kav-250 probably has twice the transformer size of the Kav-500...the center and mains will hit it hard, as that is where most of the sound is in movies.

I used a Ksa-250 with my Kav-500...Apogee Duettas for mains, and Apogee Centaur Minor for center, and rear duty....this was a few years back....(early multichannel SACD days).

Dave

I concur, with Sogood51, without a doubt for the front 3 speakers.

Is power the only factor for that? The Thiels are 4 ohm speakers, so the KAV-500 would be giving them 240 wpc. The recommended power for the speakers is 50-150 watts. It seems like even the KAV-500 would be plenty, and the 500 wpc at 4 ohms that the KAV-250a would provide would be excess.

I did hook the Kav-500 to my 4ohm Apogee Duetta Signatures while I owned it. As I stated, the Kav-500 usually drove my center, and rears...a Krell Ksa-250 drove the Duetta Signature front L+R speakers at that time.

The little Kav-500, had no problem driving the "fairly large" Apogee panels to quite hi spl's in my room. I'm not up to speed on the Thiel CS 1.5s though?

Dave

I found an old Stereophile review of your speakers, the Kav-500 will drive them with ease.

BTW...use balanced connections with Krell amps.

Dave