I've had the T-50's for about 5 years. Andthat've always delivered a clean, open dynamic sound. In the past I had them hooked up to Thiel 2.3's and now Aerial 6's. Both power hungry speakers and the amps have never run out of steam. The T-50's I have were originally owned by a VP at Threshold and he had them modified to run bridged at about 100 wpc in class a. I have auditioned many amps over the years and still have not found anything that can top them. Paid $1300 for both.