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  1. #1

    how to build custom RCA stereo to mono cable?

    I need some help designing custom stereo-to-mono cables. Has anybody here built one?

    I'm experimenting with a kitchen rig of a Squeezebox2, old 2-way loudspeaker, and a Sonic Impact T-amp. Currently the interconnect is a mess of three parts, all Radio Shack:
    * RCA M-to-M "Y" adapter turns the SB stereo analog out to one mono RCA M
    * RCA F-to-F turns that into an RCA F
    * stereo RCA M to 1/8" stereo plug so that the mono sound is fed as the L channel to the T-amp 1/8" input

    I'd like to build a custom cable that would be shorter & cleaner.

    Also, I'd like to feed mono (L + R) into both the L and R channel of the 1/8" plug, so that I could occasionally connect a second speaker to the other T-amp speaker output (yes, for dual mono). I've got similar desires for another room, where I've got an old mini-stereo that will drive a single speaker but takes dual RCA inputs.

    Web searches suggest designs with resistors of various sizes:

    and my multimeter shows me that my cheap old RadioShack Y adapter is *not* a simple cable, but has some sort of circuit. The resistance between L+/M+, R+/M+, L-/M-, and R-/M- seems to fluctuate -- it's not the constant 0/low impedance I see on the F-to-F adapter or the stereo RCA-to-1/8" cable.

    Do any of you have experience building such stero-to-mono cables?


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  2. #2
    Senior Member
    Join Date
    Jan 2007
    I'd say simply use a resistor for each channel and then tie them together. The resistors function is to protect the line drivers of analog outputs.

    I used 390R on my Lyngdorg amp pre outs (subwoofer!).

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