Connecting subwoofer NOT matching OUT and IN

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If your subwoofer has RCA inputs the circuit below should work.

The Values of R will depend on how much power you're amplifier produces.
(for example: On 100 watts you want about 50k)

The Capacitors should be 100uf non-polarized with enough voltage to withstand the amplifier's output
(For example on 100 watts you want 50 volt caps)

The volume pot should be about 1k for most subs.
 

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Thanks!
My sub has L&R input. Can I run this circuit as stereo or should I combine it into L only? What formula is used for calculations. My amp is 30W.

It gets even easier if your sub has stereo inputs... Now all you need is a simple voltage divider...

To calculate the value of R1 ... calculate the output voltage of your amplifier and pick the nearest standard value resistor ... for example: for 10v use 10K or for 13v use 12k. You can adjust the actual level and crossover with your Sub's controls.

There's a handy online calculator HERE

These can be ordinary 1/2 watt resistors... the 5 cent kind.

You can build it right into your patch cords with no problem at all.

But, let me warn you ... this only works on Single Ended amplifiers. If you are tapping off a bridged or BTL amplifier things get a bit more complicated.
 

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