In a review a few years ago, Doug Schroder compared the Belles Aria monoblocs (with Aria Preamp) to the AVA products, probably because they are comparable in price and performance. He concluded that they are very similar but the Belles had a bit more life, sizzle, however you want to say it. I have a Belles Aria integrated, and understand what he means about the sound. So, I got the monoblocs, and paired them with several tube preamps, but so far haven't gotten the same lively sound as the integrated, Today I expect to receive a Belles Aria preamp, and am hopeful it, combined with the monoblocs, will deliver that sound, but better. We'll see.