What audio source are you playing? If it is an external component such as a CD player, you can convert the input signal to mono using a pair of Y cable connectors.
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If what you want is a stereo/mono switch to summing the stereo signal to mono, insert this circuit to tape-monitor loop, the tape-monitor button will become a stereo/mono switch. https://www.vinylengine.com/turntable_forum/download/file.php?id=11690&t=1 Or use a stereo to mono converter box. https://www.amazon.com/OSD-Audio-SMC21-Converter-Isolator/dp/B07FFBJ8KR/ref=pd_lpo_328_img_1/136-081... |
Even easier, connect the + from both channels into one. +L and +R both go to chassis ground, so connecting L+R positive sums them yielding mono. This is what happens inside the Y connector. Either that, or the amp goes up in smoke. Which this being a receiver and knowing how I feel about receivers just may be my ulterior motive. Only one way to find out for sure. 😂🤣 |
millercarbon - please do NOT give engineering advice that looks serious.  I understand that you might think this is a joke, but somebody may take your advice and potentially fry their receiver/amp. You never want to connect two outputs of anything into a single target, especially if they are speaker outputs from an amp/receiver. Also, this is NOT the same thing as a Y connector. It is perfectly fine to use a Y-splitter to send a single output to multiple inputs. However, a special circuit is required if you want to "sum" multiple signals. |
Just wanted to add, that for me mono means ONE loudspeaker playing a mono source, not summed stereo with two loudspeakers. OP, are you just trying to get mono to play on both channels? If that is the case, you can feed a mono source to one channel and connect both loudspeakers to that channel. You'll loose 3db of power but it will work.  |
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