If I have two amps, do I need two preamp outputs on the head unit? Also what is a subwoofer output?

I don't want to use a high to low converter or low to high converter or whatever they are called. (the thing that makes your factory stereo be able to play subs, from what I hear)If I have two amps, do I need two preamp outputs on the head unit? Also what is a subwoofer output?
You can use splitters to convert a single pre-out set for use with two amps. Both amplifiers will get exactly the same signal, so if you're using this for a front-speaker amp and a subwoofer amp, you won't be able to use the deck's fader control or level controls to adjust one independently of the other.



Many amplifiers have input and output RCA jacks. In this case you can run cables from the deck to the first amp's input, then another set of cables from the first amp to the second amp.



A subwoofer output on a head unit provides a signal that isn't affected by the fader control. If you fade the sound all the way to the front or the back, the sub output will always stay at the same level. Depending on the head unit, you may also be able to set a low-pass crossover setting for the sub output, change the signal polarity, or adjust the subwoofer volume. Some subwoofer outputs are mono, not stereo.If I have two amps, do I need two preamp outputs on the head unit? Also what is a subwoofer output?
well, it depends on how you want to wire it...



you can take 1 set of pre-outs to one amp, then run the pre-outs from the one amp to the other, or use a signal splitter...



lots of options here

blush