The Gemstone Blue Diamond is a nice unit that I had and returned for a variety of reasons. The journey ended with a Theta Dreadnaught (200 watt modules), and I haven't had an itch to switch to any other multichannel amp I've heard. A second-hand Theta is price competitive with the Gemstone. Ayre and Innersound (or similar Coda) amplifiers also merit strong consideration, although several units may be required depending on your system configuration. Go with a phantom center and a pair of Ayre V-5x/V-3 or Innersound ESL-300 stereo amps and stand back. Good luck!
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