Thiel Owners

tmsdrg - I am one of the culprits of touting the necessity to double power with halving impedance. My point was more academic than of real consequencel. If an amp doesn't double its power into half impedance, then it is by definition current limited. BUT, as has been pointed out here previously, that point of art is of no real importance as long as there is enough current to deliver to the load. So, doubling is not a technical necessity to drive Thiels, but that sense of anemic bass, slow transients, etc. is symptomatic of running out of current capacity. The 3.7 is about twice the efficiency as many previous Thiels, so the problem becomes less of an issue than before.

tmsrdg
In addition to the 8/4 ohm double power ratio, I find it interesting to ask a manufacturer about peak current in  (A)mperes  rating as well.
Happy Listening!

Happy Friday! All

tomthiel
As I started my higher end education back in the early 1990's via Stereophile and TAS subscriptions, I recall, Slew Rate being discussed quite often by the reviewers. In 2020, is this factor relevant as it pertains to power amplifiers?  I will concur with the CS 3.7 being very efficient, as well as, models CS 2.4, 2.4SE and 2.7.
Happy Listening!

Jafant - remember, I'm not an engineer; my experience is more as an observer - user. Slew rate still gets lots of attention in professional audio, especially microphones and their preamps, but it doesn't show up much in print. I have Tom Jung's original Studio Technologies Mic Pre which was reworked by Jim Williams (pro geek guru) to upgrade caps, etc. He increased the slew rate by 5x as part of his magic. The preamp improved its transparency substantially, but lots of things were done at the same time, so I can't attribute any specifics. I wonder out-loud whether slew rate gets less attention now because it is generally faster now than in the old days. Also, I can only speculate as to Power vs Pre amp importance, but I suspect SR is important everywhere equally. Some amps like Spectral place storage caps right next to the output transistors to increase slew rate substantially by purely geographical means.

My observations over the years includes SR being a major factor in transient performance and therefore detail retrieval.