I bought this hoping to amplify my headphones instead of having to adjust the volume on my amp when I practiced later in the evening.
This unit did absolutely nothing to amplify the signal: whatever goes into the unit comes out of the unit at the exact same level, with no perceivable amplification taking place whatsoever.
The unit has great build quality and it's cool that it has several input and output options, but it doesn't actually amplify anything.
Thankfully it's not an expensive product, so I couldn't get too upset about it not working correctly. I like to think that I simply "got a dud" but if this product works "as intended" then I'd recommend to stay away from this Headphone "Non-Amplifier" and get something else.
Such a disappointment for such a promising product.