so i was reading some of the reviews on here and i did agree with them at first because i was getting the same issues. Especially the very first one about only mono output, on one side or both. Thats not what happened for me. The outputs are indeed stereo, but i only got a mono output IF i used a TS 1/4 cord instead of a TRS 1/4. Make sure all of your connections are in TRS otherwise you will only get mono.

I actually bought this 5 years ago as a DJ and I am reusing it again because it works as an amazing headphone splitter for my recording studio.

I have been using mine now for about 5 years and it's still working like the day it came. For the people who complain about it only working on one side I'd have to encourage them to seek another Hobbie. Have you tried resetting the tiny little reset button on the back next to the flux capacitor? You have to look real close almost with a magnifying glass and push it with a pin. It's a super simple unit with four clean amps so if your hearing buzz it's most likely the power source or an 1/8th" to 1/4" jack adapter. I've thrown away quite a few stereo adapters because of that. Free hint there Cleatus. Try different plug ins on different circuits that aren't shared with the computer and xbox or a nice long ungrounded extension cord wrapped a few times around a doughnut to clear out as much rf as possible. I was experiencing a lot of noise until I changed some of my components wires to optical inputs. That's a huge way to eliminate interference. It takes out the electrical conducting factor by changing the signal to light that actually travels along an insulating substance. Brilliant!

I see some people complaining about mono outputs and distortion. The mono output is likely due to an incorrect adapter. Distortion is probably due to a pre-amp equalizer. My unit is stereo and it boosts volume to painfully loud levels without losing much perceived clarity. I wish I had found this sooner. That will be the last time I'm focusing on popular negative reviews.

I have long been frustrated with my PC putting out a volume level that is too low to hear clearly, even when set to 100%. My Bose 700 headphones, which demand a higher volume input, exacerbate this problem. After plugging in this microamp, I am no longer limited by my hardware, only by the volume level I can comfortably listen to. Music sounds better, games are more immersive, speech is easier to understand. A little volume makes a huge difference. I notice a quiet hissing when I turn the knobs all the way up to 100%, so I leave them down around 75% and can't hear the slightest noise. I feel greatly relieved that all it took was one cheap part to solve this once and for all.

My only complaint is that although it is quite small and easy to move around, it still must be plugged into the wall to operate, and cannot be used on-the-go to amplify a phone, tablet, or laptop. Portable amp solutions exist, but in my experience they don't have to power to add much volume. I have yet to see a good solution for these use cases.

Does exactly what it says it does. I'm running headphones on all ports and they all sound good and the individual volume adjustments work as they should. It supports multiple listeners from a single source. Works great.
Get yourself the travel case if you're moving around at all, keeps it together and safe!