Audioaril, I'll just accept your position that it is just not possible to audtion all the great amps of the world. However, after narrowing down the field, you could arrange home audtions, you just pay the shipping back after your audtioning process. This is exactly what I did and was able to listen carefully and at home to seven very highly regarded amps, including Boulder, until I found what I was looking for. I'll give you two more entries of amps to put on your audtion list:1) Pass LabsX-600.5 monoblocks 2)Edge Sig-1 monoblocks. They are both great amps that offer many sonic virtues, but if your looking for balls/bass they both have it in spades. So, don't take my word for it, or anybody else's, use your own ear's and get busy arranging some home audtions.
Boulder monoblocks
I am very interested in the Boulder monoblocks which look very impressive and have very impressive specifications. However, there are only a few serious reviews published on these amps and for $55,000 there are many options. Essentially, for me the most important quality of an amplifier is its bass performance, I like bass that is ultra fast, tight, controlled, and with lots of slam. Another amplifier I am considering are the giant Mark Levinson No. 33 Reference monoblocks. I heard them at a local showroom and thoght that it sounded amazing. I am wondering how it compares to the Boulder monoblocks. Anyone who has had experience with the Boulder monoblocks I would appreciate your comments. Thanks.