can I convert RCA stereo @ line level to mono by connecting "y" rca cable between line level source out and amp in? - AVS Forum
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post #1 of 3 Old 12-28-2012, 02:28 PM - Thread Starter
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Ive read much disagreement on this but my thought it that it should be fine due to low power and high impedance but I'm not a expert.


I want to connect a single speaker in a bathroom that was prewired with a single 16/2 cable connected to a impedance matching wall mounted volume control. the obvious issue is the stereo L/R of most sources could eliminate some content if only a single L or R is used.

I would like to avoid buying any specialized equipment but I don't want to damage anything.

I was going to either use one y cable to combine the the L/R line level source output to a single rca and just plug that into either the left or right input into the amp and then use the same speaker level output to the speaker. the other option is to connect the first "y" cable to a second "y " to split the signal back to 2 mono line level inputs and plug that into the amp however I was concerned about just having one speaker hooked up.

I cant use a duel coil speaker with L/R connections because the ceiling has very limited clearance and I only have one 16/2 speaker cable.

what is the best way to proceed ?
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post #2 of 3 Old 12-28-2012, 02:38 PM
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No. You need a mono summing adapter. While not perfect, they're easy enough to build with a few inexpensive parts. If you don't use the summing adapter the separation of any of the stereo you might be using elsewhere will be severely degraded.

Instead of the stereo miniplug on the left you'd have the two separate RCA cables, each one feeding one of the resistors and the shields tied common.

The resistors shown are 4.75k (1%) on the left and 200k (1%) on the right. Why not wye?


Just because there is a knob doesn't mean you should turn it.
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post #3 of 3 Old 12-28-2012, 04:10 PM - Thread Starter
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great, thanks for the quick reply and for the helpful link! this is the most clear response to this question ive seen with actually information and a good link. I will investigate this term summing and build a couple cables.
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