Gents,\n\nA good friend of mine has a stereo system with a pair of Wilson Maxx Speakers, AR Mono Block Amplifiers, and MIT Cables (amongst other high end gear). He's into vinyl and frankly never left it. (He's in his early 70s now and never thought CDs sounded as good as vinyl. He doses have a Mark Levinson CD\/DVD player). \n\nThe problem, since new, one or the other of his AR Mono Block Amplifiers has blown up 14 times. He used to send them back through the dealer for repair until he retired and closed his doors. He then sent them to the AR Factory in the USA (Minnesota?) a couple of times. Even though he spent considerable $$ no one ever could find out what causes the failures. He dutifully warms up these Tube Amps before pushing anything through them.\n\nI read an old Stereophile article here http:\/\/www.stereophile.com\/floorloudspeakers\/324\/#6XcAuwTOquVAgVOx.97\n\nwhich said: \n\nWilson claims a somewhat lower sensitivity, 92dB\/W, than the X-1's 95dB. In amplifierspeak, that means a doubling of the necessary amplifier power to achieve the same effective loudness. While the X-1 offers a reasonable 8 ohm load, the new MAXX admits to a more demanding minimum of 3 ohms, which might prove too much for some tube amplifiers, even high-power ones, to bear.\nRead more at http:\/\/www.stereophile.com\/content\/wilson-audio-specialties-maxx-loudspeaker-page-2#Xi5lywYkr7hLqjVC.99 \n\nI'm wondering if his issue may be related to this. What do you think?\n\nI'd also like your opinion on expensive MIT Speaker Cables. Years ago he told me they cost him $10,000 Canadian (about $7,500 USD). I wonder if they could be the culprit instead.