I really like this headphone amp. I'm using the Beyerdynamic DT 700 Pro X headphones with it and using this amp they're the best they've ever sounded to me. A lot of that has to do with the XBass+ and Xspace features, I just think they're a really nice fit with these headphones. These headphones weren't lacking in bass or anything, but the Xbass+ feature just makes the bass more impactful and natural sounding without muddying the rest of the sound. I don't really know what Xspace is doing but I like it a lot too, it just sounds better. I almost always use both features at the same time.This is just an amp though, it does require some kind of dac to work. Basically any sound source would work but for best results a standalone dac would be best in my opinion. I'm using an SMSL SU-1 and it seems like a perfect match for this. I also tried it with a Topping E30 II which was as good as the SU-1, the FiiO D3 (D03K) which was also very good, and then a variety of other outputs like dongle dacs and old portable CD palyers and really everything sounded good through this. In the end though I still think the standalone dacs were best.I do have 1 complaint about this though and it's that it doesn't come with a power supply even though it's required to use this. From the manual it states it needs a 5v 2.5a adapter. I was having trouble finding one that would work. I bought a few 3a adapters and none of them worked for some reason. It would power on and then shut off as if it wasn't getting enough power. I ended up using my phone charger which is a 4a adapter, so now my phone doesn't charge as fast lol but it's worth it I suppose. So just keep that in mind that you'll need to get a power adapter.Overall though I'm super happy with this. I just bring it around room to room now because it's the only way I want to listen to music with these headphones now. The sound is great, it's plastic but feels like it's built well. Can't really go wrong here if you need a headphone amp
