Dingsun 3.5mm Audio Switcher 4 Port Audio Selector Box Support Connection of Active Speakers, Headphone, MP3/MP4, Android Phone, Game Console, PC, etc. (1 Input 4 Output/ 4 Input 1 Output)

TL;DR: This switch works great! No noise! Woo-hoo!DETAILED VERSION:I have up to 4 computers at my desk at all times, and use a KVM to switch monitor, mouse, and keyboard. But the KVM audio is horrible, and unusable. And anyway, I sometimes want to hear audio without interruption, as I switch between tasks, between the computers, and a KVM wouldn't do that.I don't have cheap speakers, but reference grade monitors (speakers). These are well build, well shielded, I hear everything. I often think that negative audio reviews are due to using lousy speakers that generate feedback loops.The only issue I ran into was my laptop. It emits noise into any connected speakers. When plugged into this audio switch, every channel suddenly had the noise. I added a ground loop isolator (ASIN B095RHGDD1) at the laptop, before the speaker wire that feeds into this switch. No more noise.Right now, I only have two computers plugged into it. I'll had two more in coming weeks. If anything changes, I'll update this review.Very pleased, now I don't have to have extra cheap speakers on my desk to plug into computers.

using several of these to bounce back and forth between speakers or earphones. No issues such as other users reported

Product looks great and has nice toggle, but produces a very audible humming noise when multiple wires are connected (the entire point of a switch like this). The humming noise is disruptive enough where I cannot use as intended.

This switch does what it needs to and nothing more. I'm using it to switch between my different headphone amps and my desktop monitors. It is sonically transparent. It is close enough to the size of my Schiit gear that it can be stacked on top and not look silly. The screenprinted print on the top is a bit goofy, but you cannot see it where I have it placed, so it's a non-issue for me at the moment.Probably costs more than it really needs to, but I prefer these to the button toggle RCA switches as they seem to go bad quickly and are not as well grounded.

I have noticed that once you've added in a second input, you start to hear some ground loop noise.I've added a ground loop isolator and that helps a little, but I can still hear the noise.I've gotten to the point that I only leave 1 items plugged in and since it sits right up front on my desk I can just swap cables as I swap devices.Serves its purpose but I can't say I'd recommend it.