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I love warmer... The BK is a pretty warm amp with the MOSFET design but I don't know how it compares to the Threshold. It has more power which will make it play louder, whether I will play it louder or not is another question...maybe. Probably actually. I will step in and defend the st140 slightly in regards to impedance loads. At least with the 1.5's (which are a resistive load and only dip to 3 ohms at most) I have not noticed any problems with the amp. It only gets slightly warm when playing loud and difficult music (Stravinsky's Firebird Suite) and maintains clarity and dignity :). I will say that some of the highs can be a bit brittle when pushed hard but nothing to write home about.
I've owned a B&K ST 140 and ran it with Thiel CS 2's which were a much easier load than the Thiel 1.5's. The B&K ST 140 is not a great match with low impedance loads.
The Threshold is only rated at 5 Watts less per channel than the B&K into 8 Ohms, but below 8 Ohms the Threshold is much more capable. Oh yeah, and IMHO much better sounding.
Those are hard facts indeed Unsound but what does it SOUND like? What do these figures sound like? I want to know what to look for when listening critically. Is that too much to ask? Can words describe such distortions?
as a side note, speaking to B&K the techs told me that they test all there amps down to 2 ohms and make sure they can hold their own. He also said that he was not supposed to tell me that as it was company policy to only state recommendations for 8 ohms.
But the Threshold should sound worlds better! It was 4 times the cost new! I'm excited to say the least. I'm sure you love your threshold that's in your system Unsound.
Esteborino, in the early 1980s I had a Threshold Stasis 200 driving a pair of B&W 801s and I thought that it was the best musical sounding solid state amp that I had heard at the time and I still feel that it would hold it's own from a musical standpoint with amps of today. Unfortunately, I traded it away for a Spectral DMA 200 which I later found did not mate well with my other equipment thus the system did not sound near as musical as it did with the Stasis. The Stasis did not have the transistor sound that typically was associated with amps of that genre. Solid state amps today have improved tremendously in this area.
The Stasis 200 will I think definitely improve the bottom end compared to the B&K. I say go for the Stasis.