One amp for highs and lows how would I separate them

doolittle

Distinguished
Get an active crossover like this which has adjustable frequency points for high/low pass.

Just connect the low-level outputs from your radio/amp to the input, adjust to your liking, connect the outputs to your amps - good to go!

EDIT - ok so if you are just using one amp as kanewolf mentioned not much choice you need passive crossovers like this 80 Hz High Pass 4 Ohm for your door speakers and something like this 80 Hz Low Pass 4 Ohm for the subs. May be more economical to just get a 4-channel amp for the door speakers and a separate sub amp which would have an adjustable low-pass filter.
 

doolittle

Distinguished
Get an active crossover like this which has adjustable frequency points for high/low pass.

Just connect the low-level outputs from your radio/amp to the input, adjust to your liking, connect the outputs to your amps - good to go!

EDIT - ok so if you are just using one amp as kanewolf mentioned not much choice you need passive crossovers like this 80 Hz High Pass 4 Ohm for your door speakers and something like this 80 Hz Low Pass 4 Ohm for the subs. May be more economical to just get a 4-channel amp for the door speakers and a separate sub amp which would have an adjustable low-pass filter.
 
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