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ASR of Tennessee, still around but they don't make 'em like this anymore.
The 600 is a 300 watts per side 70s/80s poweramp. Mine has the meters laid out horizontally and the stock photo I found has vertical meters but the amp is the same. The P600 sounds more like a crest than a crown. A fairly hifi sounds that has pretty low THD even when slamming loud. Can be used ganged mono or with 1 side disable via a switch on the back. Mine has big metal handles pictured to make rack removal easy but some don't and that's a shame because they are needed. Takes up 4RU like an H&H. These are great amps and mine is currently powering my 3 way Yamaha ANS's. You wanna be careful with this guy in a studio role as it blows out a lot of passive speakers! Its a great amp for larger monitors and kills it powering individual wedges in dual monoblock mode. Ia ctually got this as a gift from my oldest friend along with the old Teac 15 console I had for years. Great, low rent vintage setup. I was never fond of this in a guitar role for wet/dry/wet though It had some harsh when I needed to fill the really big venues, though I really liked using it in ganged mode for clarity where I was running 2 plexis and a single dual showman with this as the stereo for the showman.... anyway, these are cheap and readily available and kick some ass. The back gets hot, use caution if moving a rack after show! don't touch the heat sinc and don't close the back of the rack until its cool to the touch. Built like a tank but the down side is it weighs a ton. This fucker gets tube amp loud too. its not as loud as an SVT's 300 watts, but with a preamp out front for abss it gets damned close though an SVT 8x10 much like the H&H... has much better bass response than an H&H to my ea. Fast and precise with a helluva kick. In the studio I sue this and the 3 ways when working on my bottom. In solid state power amps Crown is the modern while H&H is British, Crest is in between and ASR is very American. If you have the luxury of collecting stereo PAs then add this to your stash. ALSO! and importantly there is no protection on the power switch so it thumps into your bass drivers when powered up. I never turn mine off for this reason. It stays warm but is well ventilated under my work space... the thump can blow a woofer. This won't happen on an H&H though it plagues Crowns and Crests of similar vintage to mine (70s)... I suspect that they remedied this with an RC network on the 80s ones as pictured here like Crown and Crest did but who knows?