stereo or mono?
85GSi
02-13-2005, 06:16 PM
I have a 2 channel amp running two 4 ohm subs which is fine and all but there is a switch on the amp which can select between low pass mono, full range mono and full range stereo. Can I run a sub off each channel and have the switch on low pass mono so i can utilise the low pass crossover frequency control? Currently im playing it safe and have the switch set on full range stereo but i dont really want to waste power by trying to get the subs to play frequencies beyond thier range.
sr20de4evr
02-13-2005, 06:55 PM
yes you can, normally the amp will take either the left input and put that on both outputs, or it'll sum the 2 inputs and put that on both outputs. Either way you'll get a mono signal going to the subs and you can use the lowpass.
Diceman83
02-13-2005, 09:40 PM
Does it matter if the subs are in a parallel wiring configuration (so the amp is seeing 2 ohms)? Some amps (like mine) will only do mono bridged output at 4 or 8 Ohms. 85GSi, you'll have to check your amp's spec's to see if it's possible.
Another wiring question: can you run a wire from each channel on the amp to each channel on the subs (so each sub is getting both left and right output)? I'd think that would only be a problem if you were sending a stereo signal to each channel on the amp.
Another wiring question: can you run a wire from each channel on the amp to each channel on the subs (so each sub is getting both left and right output)? I'd think that would only be a problem if you were sending a stereo signal to each channel on the amp.
sr20de4evr
02-13-2005, 10:12 PM
Another wiring question: can you run a wire from each channel on the amp to each channel on the subs (so each sub is getting both left and right output)? I'd think that would only be a problem if you were sending a stereo signal to each channel on the amp.
you mean wire the + and - from both channels to the + and - on the sub?
if so that's a VERY bad idea, you'll actually be wiring the channels in parallel and any difference in their signal will effectively create a short circuit in the amp. Actually, with bridgeable amps, you'd create a short circuit even without a difference in the signal because of the way they're set up. Extremely bad idea, the only amps I'm away of that can do this are the new JBL/Crown amps, and that's only because they specifically designed them to be able to do that.
you mean wire the + and - from both channels to the + and - on the sub?
if so that's a VERY bad idea, you'll actually be wiring the channels in parallel and any difference in their signal will effectively create a short circuit in the amp. Actually, with bridgeable amps, you'd create a short circuit even without a difference in the signal because of the way they're set up. Extremely bad idea, the only amps I'm away of that can do this are the new JBL/Crown amps, and that's only because they specifically designed them to be able to do that.
Diceman83
02-14-2005, 12:20 AM
that's what I was worried about... good thing I never tried this out :)
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