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Questions about computer stereos Answered

Hi! I'm building a portable amplifier from old computer-speakers and I have a couple of questions about them. 1. How do I make the stereo-speakers mono the best way? 2. Is it possible to make low- and high-pass filters to a simple amplifier as the computer ones? I thought I'd connect one bigger speaker (a whopping 5" one!) to amplify the low frequencies and one small to amplify the high frequencies. This would work the best with a 1-channel amp. Thank you in advance, hope you understand what I'm looking for! P.S. Please move the thread if it is in the wrong category, wasn't sure if it suited better under "music" or "tech".

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Henell
Henell

12 years ago

I solved problem number 1 by robbing our familys computer-stereo, which had a button to choose if you want stereo or mono sound, easy solution! Now I'll start thinking about the filters.

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Henell
Henell

12 years ago

Thanks for the help, I started working on point 1 and put the wires together. It works nicely when i tested on my computer, the sound was mono, and no troubles found. But when i connect my iPod to the amplifier, the sound starts lagging, but only when I turn the volume up on my iPod. It works fine when the wires are connecter stereo, but when I connect them the way you suggested (I hope I understood right) the sound starts to lag. I'll take some pictures and a video later.

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PKM
PKM

Reply 12 years ago

I think just connecting the stereo wires together to make it mono will do weird things when the two channels are very different. I would suggest putting a diode in line with each one so current can't flow from the left into the right source channel, but the voltage drop would presumably ruin the signal. IDK what's best to do about that, I think there are hardware solutions but they are pretty involved. Your best bet is probably combining the stereo channels as early as you can, into a high impedance amplifier, with the volume on the source device (eg ipod) low.

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NachoMahma
NachoMahma

12 years ago

. A quick search of Ibles didn't turn up much on crossover/filter design. :( 1) If you want to combine L+R, just put the source output (amp input) + wires together and the - wires together. . 2) The easiest way to do it would be to rob the crossover/bridge/filters from old speakers. You should be able to find something at a yard sale, flea market, &c for next to nothing. If you want to make your own, Google "crossover design", "audio filter circuit", &c. . . If you want to look it up, that's called "bi-amping." . . Music seems to be aimed more at creating and listening. I think it fits better in the Tech category. I moved it for you.