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From: TimPerry on 24 Jan 2007 20:25 Eeyore wrote: > "Ron(UK)" wrote: > >> Best way to test an amp is to lend it to a DJ for a night. ;) > > That's *exactly* how I derived my test ( see other post ). > > Graham that's not a test, that's amplifier homicide. my QSC USA 850 had served me well for many years until i lent it out. i got it back in fuse test mode.
From: Phil Allison on 24 Jan 2007 20:44 "TimPerry" > >>> Best way to test an amp is to lend it to a DJ for a night. ;) >> >> That's *exactly* how I derived my test ( see other post ). >> > > that's not a test, that's amplifier homicide. > > my QSC USA 850 had served me well for many years until i lent it out. > > i got it back in fuse test mode. ** That state can be achieved in about two seconds when the amp is: 1. Driving a transformer matched load. 2. Has the two outputs connected to the same speaker box. 3. Is supplied with supersonic ( ie 40kHz ) oscillations. 4. Has one output connected to the output of another amp. ........ Phil
From: Eeyore on 24 Jan 2007 20:48 TimPerry wrote: > Eeyore wrote: > > "Ron(UK)" wrote: > > > >> Best way to test an amp is to lend it to a DJ for a night. ;) > > > > That's *exactly* how I derived my test ( see other post ). > > > > Graham > > that's not a test, that's amplifier homicide. > > my QSC USA 850 had served me well for many years until i lent it out. > > i got it back in fuse test mode. You read my test method ? All the amplifiers I've designed will tolerate that test indefinitely ( well OK I've never run it for longer than 8 hours ) at an ambient temp not exceeeding 25C with a 4 ohm load per channel. Some may exhibit occasional thermal shutdown for a minute or so intermittently. They even do tolerably well with a 2 ohm load without the 10dB overdrive. Graham
From: TimPerry on 24 Jan 2007 22:27 Phil Allison wrote: > "TimPerry" >> >>>> Best way to test an amp is to lend it to a DJ for a night. ;) >>> >>> That's *exactly* how I derived my test ( see other post ). >>> >> >> that's not a test, that's amplifier homicide. >> >> my QSC USA 850 had served me well for many years until i lent it out. >> >> i got it back in fuse test mode. > > > > ** That state can be achieved in about two seconds when the amp is: > > 1. Driving a transformer matched load. this individual at times uses peavey stage monitors that have a volume control on them. this adjusts total speaker volume. i dont know what type it is but it could be inductive. > > 2. Has the two outputs connected to the same speaker box. this individual is capable of doing this. it is not a scenario that would have occurred to me. he has been setting up mixpack + speakers on stands for years. > > 3. Is supplied with supersonic ( ie 40kHz ) oscillations. this individual plays mostly MP-3 from a laptop... using heaphone output. > > 4. Has one output connected to the output of another amp. > this could have happened also. he has been using my Soundcraftsman PM860 for months without a failure now. i suspect most likely it was a direct short on the output. i had to replace several of his 1/4" plugs.
From: Phildo on 25 Jan 2007 00:30
"Earl Grey" <eg(a)t.pot> wrote in message news:45b7abd4$1(a)clear.net.nz... > Phildo wrote: > >> >> At Brit Row the guy there (Jerry Wing - top sausage) would just drop the >> amp on the floor off the bench as a final test. He would normally wait >> until the rep was there before he did it just to see the look on their >> face. >> >> If the amp didn't survive that it would never survive a ride in the back >> of a truck. >> >> Is always a good idea to knock a rack about a few times after you've put >> it together. Will show up any loose cables etc. >> > You should tell him about those Behringer amps you discovered. Why on earth would I want to do that? Brit Row are already well sorted for amps. You seem blissfully unaware of the market the Behringer amps are aimed at. Get a clue why don't you. Phildo |