Thiel CS6

I'am using a pass labs x350.5 plenty of power and current.

I used to use Parasound JC-1 mono amps to drive my CS7.2 with good result. The CS 6 and 7.2 have a lot of similarities, especially the impedance.

I am now using Lamm 2.1 monos as they seem to match the 7.2's tonal balance better. But at about $4k used, the JC-1 is really good. IMO, big powerful solid amp will do it, but matching the speaker's tonal balance is the key as this varies among users' preference. I would stay away from tube amps unless you can audition it for a good period of time to test it out before buying it.

I am using VTL 300 Deluxe Mono Blocks. They do very well. I have used Krell in the past. It had tons of bass but was a little bright for my taste. Also look in the Thiel manual there is a list of recommended amps in it.

I use a Krell 400cx with the CS6. They need current down at that critical 2.3 Ohm minimum and the Krell delivers. Great match and Jim approved when I told him what I was using with these.

Try a Butler amp. Thiel uses Butler amps to test their speakers.