On my speaker based audio system I am presently using an Audio Research LS27 preamp, but only a simple Odyssey Khartago amplifier. The reason is right now simply finances. But why I am mentioning this at this time that I still am able to achieve a quite presentable audio system in spite of the vast cost differences betwen the two. In my opinion the preamplifier being used is more important than the amplifier being used. Thus I would bet than having a PS Audio BHK preamplifier to use with their stereo Stella amplifier would create a much sound than using their $1500 preamplifier with their 250 amplifier. With my Audio Research LS27, using high gain, I get excellent sound with my little 110 watts per channel amplifier. Which helps explain why Alan Wolfe of Magico used to use the same exact Odyssey for his own audio dydtem as I presently do. And on paper the simularities between my LS27 and the BHK preamplifiers seem very simular. Which one sounds best would a direct comparison between the two. Again, thru going on 50 years in audio I personally think the preamplifier isthe single most important part of a high quality audio system, and that an audio system should be centered upon it for best results.