Thiel speakers--can you power them with reciever?

What model Thiel are you thinking about?

If you are talking about anything model6 and higher you will need LOTS and LOTS of power and be able to handle 2 ohm loads and maybe lower.

A friend of mine has Thiel model 7s amd his new Moon W-7M 500 watt amps had to be modified by Simaudio to handle the load at loud volumes.

Thiels I think were not intended to be used with a receiver and I also agree with Mitch4t.
THX has nothing to do with weather you can handle Thiels, you will need real transformer power not chip power.
Most speakers built today do not have the constant loads Thiels have, we use Subs more now for that kind of bass.

Thiels are great speakers but are hard to power and give justice to with just any amp.

I was thinking of something like the 2.4 or 2.2

What about some of the other brands? Any experience?

My power amp is the Sherbourn 5/1500A, which is a 5 mono channel design. It has 5 toroidal transformers in it and is rated at 200wpc into 8 ohms, and I think 350wpc into 4 ohms. If this is not enough, I need to move on from the Thiel idea and look at other brands.

If your receiver has pre-outs you can run a two channel power amp to just the front and use the receiver power for all other channels.

When I first started about 8 years ago in college I was very tight on money and bought a pair of B&W 703s (90dB) and ran them off the receiver I already had (and Onkyo rated at 100 watts). At the time I thought it sounded good but I bought a cheap rotel amp (also rated at 100 watts) off of ebay and it made a world of difference.

The speakers had much more bass and improved in almost all areas. It was like I have bought different speakers. With that being said the Thiels impedance curve is much worse and will be a lot harder to drive the my old 703s.

If you want something small that you could tuck away out of sight you could look into class-d amps. They keep getting better... They are small, run cool and have lost of power for the money.

I've used Thiels for over 20 years now. I've tried quite a few different amps on different models. Unless your using something like the M series B&K amps, don't bother, and you can forget the rest. Sure these budget amps can hum a tune on the Thiels, but they'll never get them to sing to their capability. That's the one caveat with Thiels, they'll clearly demonstrate what proceeds them. If you can't afford to feed a Great Dane get something else. BTW, while the newer Thiels are more sensitive than the older ones, the older ones had an easier impedance load.