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How would I go about building an amp with a variety of (specific) inputs and different types of outputs (connections)? Answered

Okay, so I would like to build an amplifier or something that powers several speakers, as a stereo. I would like to be able to have several inputs such as RCA, 3.5mm or 1/4in headphone jacks, perhaps HDMI if possible, coaxial, SPDIF, and perhaps some banana plugs for audio experiments or something like that. I am not sure of what type of driver would be necessary to power a sub-woofer separately, or how to integrate that into such a system. I have noticed that for 7.1 and 5.1 surround sound systems they have specific out puts for different speakers in assorted locations, and I do not know if they have different frequencies, or only part of the sound. How would I create that? I suppose if necessary I would build it from schematics, but I would like to avoid creating several circuits on separate power inputs. Also how does the ohm rating of speakers affect the output? Any help is greatly appreciated, and I am sorry if I come across as un-knowledgeable.

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