SPRODIO Single Stereo to Mono Converter, RCA L/R audio adapter stereo to mono summing cable adapter SC21

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.

Working exactly as expected. I use it to connect a preamp that does not have a dedicated subwoofer output. The preamp does have an extra stereo right and left RCA out which I connect to the stereo side of this device and then run a single line from the mono side (right or left) to the one RCA Jack on the subwoofer. For me this is to ensure that tge bass frequencies from both channels are reaching the subwoofer.

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.

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.

Durable

Well, I'm surprised and disappointed. My particular purchase does not work. Tried with multiple devices...stereo in nothing out. Pity, it looked promising. YMMV.