Impeccable build and sonic quality - Multiple outputs - Minor gripes only

First of all, this headphone amp has a very solid build and can power any headphones, up to the power-hungry Sennheiser HD-800S (with a 300-ohm impedance). It never gets hot either, even after a whole day.



I tested it extensively with a couple of very good headphones, Audeze XC and Hifiman Ananda, and both performed at the top of their capabilities. Sound quality is impeccable, and power feels unlimited.



It's great to have multiple gain levels available, because the Audeze XC produces considerably louder sound when connected to the balanced output compared to Hifiman Ananda. I am changing gain level to compensate for that when switching headphones.



Another great feature: ALL THREE outputs (balanced, 6.4mm, and 3.5mm) work simultaneously. I connected three pairs of headphones, and all of them worked very well together. Ample power available on this amp made it possible. Convenient for testing/comparing various headphones.



Added bonus: Matches my Topping DX-7 Pro Dac/amp perfectly in terms of style and size. (The Monoprice amp is deeper, though, but it doesn't matter aesthetically).



Minor gripes (to stay objective):

1. The documentation is NOT available (checked with Monoprice support). While most functions are self-explanatory, I still cannot understand what the Timed OFF/Bypass switch on the back panel does... The Support doesn't know it either :-).

2. There are no tick marks around the volume rotating knob at all, so you have no idea where you are volume-wise. There is a tiny black-on-black mark on the knob itself, but it's not visible under normal conditions unless you search for it with a flashlight...

3. The button on the right switches input between balanced and RCA, but again, it's unmarked. You figure out that balanced = depressed state experimentally (and there's no doc, as I mentioned).