Hello, I have used ASR a few times in the past but never made an account. Well, here is my first comment on this site. Anywho, I do agree with the previous commenters about the old, big Perreaux amps. I found a 5000B from a studio & my buddy who has been doing this for a very, very long time begged me to trade it to him. I did begrudgingly (mainly because I had not had the chance to hear it much, but also because I have seller's remorse on rare gear), and when he hooked it up he told me its the best amplifier he has ever heard. I went over to his place to hear it (I heard his previous system's revision a couple nights before, so the sound was still burned into my memory) and on the first song I could tell it was the best I had ever heard as well. His Electrovoice Sentry 4's (he has 2 pair, and 1 pair of sentry 3) just got the sweetest, smoothest midrange I had ever heard. Flash forward about 6 months, I am now the owner of a PMF 5550, one of the most overkill amplifiers ever. Retail was $4,250 back in 88'. They now drive a pair of mirror-imaged DQ-10s, which I am updating the capacitors on within the next month or so. Before the DQ-10s, they briefly powered a pair of Apogee Centaurs. I believe those were about $2000 back in the mid 90's. I got mine for 200 bones, with fully functional ribbons, but let them go when I saw something else I wanted. I see a few have mentioned the Ampzilla. That was a terrific amp as well, but if we are going to mention them, I believe the Son of Ampzilla is a better candidate. Said to be the best sounding of the trio. Once I restore both of mine, then I will be able to determine. Also, of the old Crowns, my amplifier engineer friend said the D-150a series 2 were a top 10 amplifier design ever produced, for bass that is. Ken Rockwell's findings seem to have only further made me a believer of that.