Wiss Audio HA-M100 Mini Headphone Amp

I have four portable headphone amps, and this one does NOT amplify anything more than what the original source is. You would expect an amp to amplify the source to be able to drive power hungry IEM's or headphones to higher levels. Not in this case with this amp. It does not add any coloration to the source either which is strange as most headphone amps have a sound signature either being warm, bassy or treble boosters. This one again, nothing. It just sounds exactly like the source. Not more powerful than my LG phone. The M120 is much better