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    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Combine left & right for sub

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I realize this isn't the perfect topic to ask this question, but I suspect it will be a very short answer.

If I get a sub w/ a single RCA input, (made for an amp that already combines the channels) do I just need to send the left and right channels through a diode per channel to combine them? (or is something like a 1k resistor per channel good enough?)

To clarify, I'd like to take the signal from my source, before it goes into the amps, and split it between the sub and the tube amp. Then the sub being mono in, I need to have the left and right channels combined. (I haven't bought a sub yet, but Im borrowing a friends and it only has a single RCA input jack)
My "full range" drives aren't quite what I'd call full range, so the sub will be picking up the bottom end.

Thanks!
 
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