Just bought my first pair of Advents--originals with the 10" Masonite-ring woofers. Any tips would be appreciated. Although I have refoamed AR and Allison speakers, these are new to me. Pete B has been generous with his advice but I know he's pretty busy now and I have LOTS of questions, so I'm posting them here. I know some people don't use shims, but my usual supplier, M-Sound, gives good arguments FOR shims. OTOH Pete, who has worked on Advents, writes "the LA woofer has to play up into the l