SPRODIO Single Stereo to Mono Converter, RCA L/R Audio Adapter Stereo to Mono summing Cable Adapter SC21

FINALLY, a solution for mono output from stereo mix. Looked everywhere for a way to convert stereo output from a basic DJ mixer into a mono feed to a single PA speaker for a mobile rig. Thought this would be easy, but no one seemed to have a simple answer. Sweetwater was baffled, B&H had nothing. Y-cables with adapter had horrible phase issues. Then this little thing did what no one else could do. Stereo to mono, perfect sound. Problem solved.

If you’re like me and live in an older house with some vintage tech (in my case, a home intercom/radio system from the 70s), you know how fun it is to impress guests with the fact that it still works. The only downside is being stuck with radio ads… or songs you absolutely hate. Fortunately, my unit has an AUX-in via a single RCA connection, and I didn’t have anything that outputs a true single-channel signal. Adding this inline has been a big improvement—rather than just passing one L/R channel through to the speakers, it properly combines the audio and has noticeably reduced the static/crackle I used to get when playing music from my record player or Alexa. Definitely recommend if you’re trying to clean up a noisy connection on older audio gear.

It works ok but I don't like the fact that the jack colors are swapped from what they show in the picture. The left side is red and the right side is white. Normally, you'd have the right side red and the left side white like the product images show. I know it doesn't really matter but I would have gone with another brand if I had known.

One of the channels of my 5.1 home theater amplifier stopped working so I'm using this to run both rear speakers through a single channel (for now at least). Sound from the L and R channel now appear on both rear speakers and I haven't noticed any attenuation in volume or degradation in sound quality (I have an Anthem D2 prepro with an Anthem P5 amp so it's a pretty good system).

Yes it attenuates, but note that it attenuates a *lot* more if you put it in backwards. It's symmetric and will "work" if you accidentally hook the stereo input up to the mono output side and the mono output side to the stereo input side, so you might not notice. If you're seeing extreme attenuation, check the wires and labels.

Like a few other folks, the output of this sounds like one channel clobbers the other or some variation of that. My setup is from my turntable to amp to this then a single studio monitor. My Mono 45s sound great. Stereo sound mid at best. Could be some of these are better than others. I wish I’d tested it earlier. I would not recommend this, and am considering just making the enclosure work to accommodate a second monitor and forget mono all together.

Seems to work well for my intended purpose which was using a stereo bluetooth receiver in my old intercom box. Easy to hook up, requires no power. No discernible loss of fidelity or other defects. Solidly built and will be easy to stick inside the intercom cabinet with double stick tape.

Yes, it does stereo to mono but it cuts the output severely. There's just two resistors on a circuit board inside so no magic. About as pedestrian a converter as you can get. Not any different than all the others on Amazon so consider that. Looks nice though.