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Looper's Delight
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At 01:26 PM 2/5/00 -0800, Claude Voit wrote: >Tim Nelson wrote: >> I've already double-checked the wiring to ensure that the polarity is >all >> copacetic and everything, the amp's mono/bridge switch is in the correct >> position, the board's not overloading, the input levels are fine; I >can't >> find a problem... > >did you try it with another line source like the MD direct in the amp >to test the amp alone ?? Good idea. I just tried it; the problem's still there, so I think I can rule out a mixer problem suddenly having developed. It's either the amp or the way I'm using it. >>the amp's mono/bridge switch is in the correct position >are u shure ?? I had visually checked the switch when I opened the box, but hadn't physically set it, so I just pulled the amp out of the rack to be sure. It was correct. (The switch is recessed into the bottom of the unit and is inaccessible when installed in a rack.) > >sorry if doesnt help because >I'm no technician just another guy with a big system that sends you some >compassion Merci, Claude! What I'm suspecting now( yet since I'm no engineer it's only a guess) is that the problem may in some way be related to phase, since it only happens when the signal to the two sides is different (i.e. when there's a true stereo source, when the pan control on a particular mono channel isn't centered, or when the output faders are set to different levels. At extremely low volumes, the problem disappears. I know the amp has protection circuitry which will not allow it to operate if the load drops below 4 ohms, and I'm wondering if that might be happening, since the "protect" LED flickers whenever the distortion is present. I'm not exactly sure what the load is; I'm using it to power a pair of SoundTech monitors which each have 1-12" and a horn (the specs panel was never filled out and I got them at least secondhand) but I can't imagine them being lower than 4 ohms. (Trying to smallerize, and not have to carry the big cabinets around!) I suppose I should start looking for my meter... Does anyone know if this type of problem would occur if the impedance of the monitors were not the same? I'm assuming they are identical, since they're the same model, but I'm not certain. They're pretty beat up, too, so I'm not ruling out anything! I have to pack the rig up in an hour or so to take out to play this afternoon. I can get by without using the SR-16, and I suppose I can use an adaptor to send the MiniDisc in mono to an unused non-stereo channel, but there go my cool side-to-side sampled atmospheric loops! I guess I'll be bringing the bass heads and cabs as a backup... Thanks, Tim