October 6, 200916 yr Gary, around 180v. 91v zeners back-to-back on the input, then a voltage doubler.
October 6, 200916 yr I'm all too aware of just how bias functions so I won't mess with it too much. MOAR POWAH!!! instead...
October 9, 200916 yr I just put thin rings of blutak on my SR-X between the metal ring and the plastic baffle, around the driver screens. I think I've inadvertently created a bass reflex design (there's probably a hole in the rings) because I'm getting MOAR BASES and the highs are slightly less brash than before. I don't know why, but I feel like the sound is a bit more polite now, too. Not sure if that's a good thing.
October 9, 200916 yr Both sides the same. Sorry, I'm not good at carrying over plurals, sometimes. One ring of blutak each. Edit: Listening to Angel (Massive Attack) = much ear-massaging bass.
October 9, 200916 yr it's only like 420volts over, should be fine..... Reeeeeeeelly? That's.. that's... [trails off, mesmerized] What happens when you crank it up? or don't you?
October 9, 200916 yr Using my SRD-6SB off the headphone outs on receivers... heavy distortion and sounds like there's some kind of low pass filter. Sounds horrible.
October 10, 200916 yr Reeeeeeeelly? That's.. that's... [trails off, mesmerized] What happens when you crank it up? or don't you? Oh yes, I cranked it good 'n propper. Sounds better than they ever did with the low bias on the stax box. The Koss amp really brought them to life... in a 'twice as bright/half as long' kinda way They were going for a good 3/4 hour like that. It hasn't done any damage but probably would have if left for too much longer. But the sound.... the sound... aaaah
October 10, 200916 yr Reeeeeeeelly? That's.. that's... [trails off, mesmerized] What happens when you crank it up? or don't you?Mind melt. Or...do you remember that scene in Green Mile, when he didn't wet the sponge?
October 10, 200916 yr Oh yes, I cranked it good 'n propper. Sounds better than they ever did with the low bias on the stax box. The Koss amp really brought them to life... in a 'twice as bright/half as long' kinda way They were going for a good 3/4 hour like that. It hasn't done any damage but probably would have if left for too much longer. But the sound.... the sound... aaaah Hmm, if it wasn't arcing straight away is there any reason it would get damaged?
October 10, 200916 yr A change in humidity can make them arc or higher drive voltages. Hell with that bias, looking at them the wrong way can make them arc...
October 10, 200916 yr I'm just wondering whether Beyer had actually used too low a bias voltage on their stock amps, but I guess the only way to find out is to measure the amount of space inside the driver.
October 10, 200916 yr I'm sure they were being a bit conservative so a 400v+ bias voltage could work. The bias is governed by the square of the D/S gap so if the gap is 0.4mm then 500v would work. A SR-007 works just fine at 750v...
October 10, 200916 yr If you up the bias on the O2 won't the efficiency increase, decreasing the necessity for as much back power?
October 10, 200916 yr Yes, to some degree at least. The bias is the potential of the drivers so smaller drive voltages are needed but they will still be a tricky load so current is again the name of the game here.
October 11, 200916 yr Well all I can say is the gods were smiling upon me to allow 600V through a 180V phone for the best part of an hour. I'd continue doing so if they weren't so damn rare. It's the best 'stat phone I own, or heard seeing as how I've yet to hear either O2 jades or HE phones. The ET1000 sounds fantastic to me.
October 11, 200916 yr Hard to argue with that. But do take every precaution: keeping in mind Spritzer's caution, don't ever look at your ET 1000 wrong.
October 11, 200916 yr Well if they do arc then I can send you some 1.4um or 0.9um Mylar-C to get 'em going again.
October 11, 200916 yr I have just replaced the crappy cables with the new Morays. It's like listening to another headphone. Before, the sound gave a foggy and dark feeling. Right now it's like being at lake in a sunny day It's exactly the tonality I was after.
October 11, 200916 yr I have just replaced the crappy cables with the new Morays. It's like listening to another headphone. Before, the sound gave a foggy and dark feeling. Right now it's like being at lake in a sunny day It's exactly the tonality I was after. Until this transcendent moment you must have been thinking that most O2 lovers were nuts
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