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

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).

I have on my desktop my stereo PC speakers and also an old CRT TV that I sometimes use as a secondary monitor for watching videos on. The CRT TV has only one RCA audio input jack. I could use an audio switcher to isolate the TV, but I prefer to use my main stereo speakers at a lower volume to provide some bass. Long story short, using a Y-splitter to lead to the stereo speakers and to the TV and then another Y-splitter (after a headphone-to-RCA stereo converter) to merge the stereo channels to mono means that my PC speakers will always output mono as well. This unit keeps that merge separate from any other split on the line, so I can now enjoy the TV in mono while my PC speakers retain full stereo. Brilliant!

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.

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.

Phenomenal little device that I didn’t know I needed it. My 2 subwoofers sound a lot better now and tighter than before

Worked perfect. I used to drive my mono home intercom from my stereo entertainment system. Worked perfect and provided a nice combined mono output. No noticable distortion and minimum loss.

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.

Obviously a very very easy introduction into your stereo chain. I wouldn't call it a waste of money but it is a very cheap piece of hardware and the effects are very subtle. RCA cables do not even fit snugly like they should. Mind you my setup is middle-highend so maybe my standards are a little high.