Blown CS7.2 Tweeter/midrange

Ckoffend,
I agree with you. It could be the amps. However, the amps I am using is a pair of Lamm 2.1 mono blocks that I trust. They are rated 200 watts at either 4 or 8 ohms. It has a switch at the back to select the ohm setting. It is class A up to about 36 watts, then AB above 36 watts. I would think the amps should be adequate. I have this amps and speaker combo for a year without any problem until last Sunday when the tweeter blew. I have yet to hear from Thiel about the cause of the tweeter failure.

In fact, I played louder than 90 db before on some occasions with ultra dynamic classical music. I was just playing the first cut of side one of Art Pepper "Meet the Rhythm Section" 33 rpm by Analog Production when the tweeter failed.

That said, 300 watts could be a better match with more power as reserve.

Judging from what I have used with my thiels i would think you need more amp. even when using my Ayre V-1XE it became compressed at times when driven loud and was always running very hot trying to push the Thiels. it is rated at 200/8 and 400/4. I also noticed the Parasound JC-1s I used with mine never really took hold of the speakers the way they did with other speakers I used them with. I am using big Krells now and, WOW! I also tried the big Pass amps and thought they did a good job but preffer the sound of the Krells.

It's very possible that the posters above are correct, you might need a bigger amp capable of dealing with the 7.2's 3 Ohm load if you want or need higher peak volume in your room. It's very possible that you just got unlucky and a less than perfect driver squeezed through and just gave in. Or all or none of the above.

Heres hoping its just a driver issue.

I own the Thiel CS 6 driven by a stereo Bryston 14BSST 600 watts into 8 ohms. And 900 watts into 4 ohms. The Thiels like a lot of current before it can sound good. I have a medium size room and normally play at medium volume. Although I've never had any tweeter problem I am careful not to overdrive my speakers. The Art Pepper meets the rhythm section is quite dynamic. When played at a slightly louder than normal setting there is quite a lot of current going to the tweeter because Thiel runs their drivers with a 6 db crossover. Most manufacturers use a 12 db crossover or higher. I believe the cause of the tweeter failure is too much current going to the tweeter. The tweeter's voice coil is quite thin and cannot tolerate too much current going to it. I am interested to hear what findings if any that Thiel's find about the blown tweeter.