While this is a current amp, the Prana Fidelity Class D amp has no shortcommings. At the LA SHOW yesterday, I heard the $10K 400 watt 8 ohm amp driving the Prana two-way average efficiency speakers off of a Townshend Allegri Reference Autotransformer preamp, Silversmith cabling and EAR Classic CD player. Best in show sound (it was a limited size show with only about 70 vendors). Other than deep bass, it had superlative coherent sound, dynamic and involving. Better than a twice the price Harbeth 40.2 anniversary. Listened for 45 minutes (analog too). Never heard a autotransformer pre-amp with such slam/dynamics and colorful sound. I heard the amp several years ago and was impressed. Our records and CDs, classical, vocal, jazz and rock. Now, the entire chain of music was magnificent! https://pranafidelity.com/index.php/project/purnama-amplifier/
I use a combo of classic amps, EAR 890, radical modified Dyna ST70 and a pair of custom Altec 1459 (transformer and case only original parts). The Prana is definitely in the running to replace the custom pair and 890.