Jafant,
I used a Krell fpb 300 on my 2.4's, which is very high current and doubles down to 2 ohms or below. The fpb series was made in the early 90's, I think. Mine had fresh caps done at the factory. As these get some use, I'd look for freshly recapped models. The older KSA's are great buys, if they have fresh caps. A Thiel dealer in Amarillo used an old KSA 50 for some CS5's in his bedroom. Not that I'd recommend that. I think for most Thiels the older Krells or Classes are great and are still available online. The KSA's are heaters though!
I used a Krell fpb 300 on my 2.4's, which is very high current and doubles down to 2 ohms or below. The fpb series was made in the early 90's, I think. Mine had fresh caps done at the factory. As these get some use, I'd look for freshly recapped models. The older KSA's are great buys, if they have fresh caps. A Thiel dealer in Amarillo used an old KSA 50 for some CS5's in his bedroom. Not that I'd recommend that. I think for most Thiels the older Krells or Classes are great and are still available online. The KSA's are heaters though!