Originally Posted by ME16510
Hey guys I am really new on here, and am an aspiring audio engineer. I was wondering how would I use multiple power amps for many speakers. My soundboard is around medium sized with 16 channels. It has left and right outputs plus auxiliary outputs. Anyway I was planning on taking the left and right outputs into a crossover and having like 2 amps for high end 2 amps for mids and 2 amps for the lows/subwoofers. My problem is there is only 1 output for the highs/mids/low... How would I plug the 1 output into 2 amps? Hopefully I made sense here. Any help would be appreciated.
If you want to do exactly what you've said, you can do it by connecting each of your stereo line outputs to the input of a 3-way electronic crossover (2 complete crossovers required) with adjustable crossover frequencies. The frequencies must be selected to match the frequency range of the speaker drivers you are using. Probably something like 80 Hz and lower for your sub, 80 Hz to possibly 2.5 kHz for your mids and above 2.5 kHz for the high-frequency speakers. The frequencies must match the operating range of the speaker drivers. Any internal passive crossovers in the speaker systems should be removed.
For just a full-range plus sub system (commonly called a 2.1 system), you need only one "stereo crossover" and a "signal-summer" circuit which can be built up using a couple of 1k or more resistors connected to each side (L & R bass out only) to mix the channels into one sub channel. If you use (2) subs (and (2) sub amps.), you don't even need the "summer".
Appropriate electronic crossovers might be the Ashly XR-101
or the Sampson S-3WAY
If you just want to connect the full-range mixer outputs to (2) power power amplifiers, all you need is a simple XLR (female) to dual XLR (male) "Y" cable
. It's no problem connecting one (low impedance) line output to (2) or more inputs. Although you should NEVER connect (2) outputs in parallel to combine them without appropriate combiner circuitry.
The reason you must have the electronic crossovers is that you should not pump the low (sub) frequencies into your mid and hi freq. drivers and you should not pump any mid and high frequencies into the subwoofer.
Virtually all professional studio monitors sold today use electronic crossovers and seperate power amps for each frequency band. Often the amplifiers are different in power ratings and sometimes in design detail so that they are optimized for each frequency band and for the specific speaker drivers thay are matched with.