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I have a kenwood head unit with front and rear RCA outputs but no subwoofer rca outs. How do I go about hooking up my amp to the head unit well maintaing the low frequencies for the subs?
If the rear channel preamps are rear/sub selectable then you can switch them to sub preamp outputs. If not, you can just use the rear preamp outputs, but you won't have a separate volume control for your sub and if the Kenwood has a HPF for the rear speakers you probably won't be able to use it or else your subs wouldn't get all the bass frequencies sent to them. Also, since your rear preamps will be full range you'll have to set the LPF on your amp so you subs don't see frequencies above their ability.
The best and more expensive solution is to power the 4 full range speakers with the front and rear RCA's and then use the pass-through RCA output (hopefully your 4 channel amp has it) to connect a mono sub amp.
I didn't get anything from his question that indicated he had and/or planned to use a 4-channel amp for his full range speakers.
That answer has no close relavance to my question and even if i did use this idea its still using the front and rear rca's except extending them 15 or so feet through a cable to be split in an amp pass through which still wont give me low end signals if the deck only puts out high frequencies.
I did some testing today and found I will need to use a crossover or get an amp with a low pass filter. Thanks for the reply Weigel21,
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