sub and rear speakers on one amp?

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If the amp is bridgeable, here is an example on how to do it. The capacitors in the circuit are required for tri mode. The example is 100Hz crossover at 4 ohms, you can change the values to suit your needs. Connect the sub in bridged mode. Wire the sub coils in series for 4 ohm load. Verify the actual bridged connection on your amp. Most common is L+ and R-

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The amp is bridge-able.

The front speakers are Boston Acoustics S45, which I plan to run off the head unit. These are the rear speakers. I got them through an auction for $20.

I understand wiring the sub in series for 4ohms, but what are the capacitors and where do I get them? Are they just crossovers?

Also, is it possible for me to do this with my stock head unit, by converting the rear speaker outputs to RCA to the amp?
 
You could put resistors on the high playing drivers or and L pad, problem is its hardly worth doing. You can pick up a 4ch amp that will work for say $40 on epay until you get something better. It will work far better than any HU. However you would need an aftermarket HU or at least another LOC to run front and rears, or I would just grab an EQ/xover to fade and LP the sub at the dash for you. I hate using amp xovers but that is just me. Then you would have that amp on the sub and a 4ch on the rest.
 
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