Encouraged by the reviews of the Lepai amplifier reviews, I searched and found a similar one. I went ahead an purchased a separate amplifier called the AK-699D. A review of the amplifier is found here on You Tube, curiously in Russian. https://www.youtube.com/watch?v=zWqwxKHe3kM Testing - I tested the unit out with a 6" woofer driver I purchased in the 1990s from Radio Shack 'Realistic' - 6 inch, 20-50W maximum, 8 ohms impedance. The sound coming out of the 6 inch sounded somewhat distorted. Could it be that the intervening decades had somehow affected the unit? Next was a 4 inch Pioneer 8 Ohm unit rated at a maximum of 20 Watts. This one sounded much cleaner, so I knew that it was the former woofer that was the problem. How is the sound of the AK-699D? I would describe it as clean, wide open, and a little antiseptic. Bass is not its strong point, as far as I could tell. Now on to the dubious task of finding proper drivers and building and enclosure. Bass from a six inch driver is not really sufficient, however. This time I am going for full sound. The question is, can one hear and identify distortion? If so, the testing and purchase of drivers and building of the cabinet may turn out to be a successful enterprise after all.