I installed this together with the CleanAmp Pro kit, so I can't really speak for each one's efficiency, but they seem like an effective combo, as my audio is pretty good now. I must say the audio on my GBC is still better but not bad at all.

After building out my GBA mod i found that my audio just went to absolute ****. I have an IPS screen, Light kit and audio amp installed. The humm and buzzing, especially when i used an ezflash omega cart, was unbearable. First I recapped my board with new capacitors, very small improvement. Next I added a Helder power cleaner mod and it basically did nothing for my audio. Finally I added this de-hum kit and at least 90% of my noise went away. There is still an extremely small amount of hiss when audio isn't playing, but its very bearable. I think these kits are a must if you add aftermarket mods like IPS screen/lights/amps/flash carts/etc. I'll be including one on every single GBA mod from here on out.

Installation wasn't the easiest. But I got it done at about half an hour. At first I thought it didn't work until I realized I was using a reproduction cartridge that had major hum on it. Once I used a uthentic GBA cartridge, I noticed that there was zero hum and zero hiss.

i use unleaded solder (99.3% tin/0.7% copper @ 350c) and the solder just wanted to whet up on the pads and not bridge between the ribbon and GBA. flux didnt help with that. wound up needing to use a wire to bridge most of the solder pads.
ive tested but even on volume off ive got a hum. i also have a amp and a CUI speaker installed. it might just be my GBA revision. but honestly ive not seen any kind of benefit from this,

Just what I needed

I love this mod! It’s easy to install if you have a bit of attention to detail and it provides a clarity of sound for headphone users that is a must!