AIYIMA DAC-A2 Headphone Amplifier DAC with Bass Treble Controls PC-USB/Optical/Coaxial Inputs, RCA/3.5mm Headphone Ouput Digital to Analog Desktop Audio Converter DC 5V 24Bit 192kHz

Edit (4/14/25): The seller saw my review and decided to work with me to see if we could fix the high pitch I was hearing. While we couldn't in the end, it does seem to be a rare issue and they offered me a full refund to purchase a new one. Changing from 3->5 stars because of the exceptional customer service.-----I bought this DAC as an affordable option for my office setup, and overall, it performs well. The build quality is solid, with responsive dials and more than enough power for my needs. Setup was straightforward, and the sound is clear, especially at lower volumes.However, I did notice a high-pitched whistle when using the USB input from my desktop. Even turning the treble all the way down didn’t eliminate the noise entirely, so I had to lower the volume to mask it. While this issue is disappointing, it doesn’t detract too much from its usability for casual listening.If you’re looking for a budget DAC and can work around minor noise issues, this could still be a worthwhile choice.

I bought an expensive USB interface for my computer. It had an optical jack, separate headphone and speaker volume, analog xlr inputs, and multiple outputs. Even though it was a hardware interface it wasn’t configurable or controllable without the software. Well the software didn’t work and so I couldn’t get the optical jack to work, which was 90% or my reason for buying it. AND it was $300. So i sent that back, fortunately a good return policy, and researched getting a headphone amp with an optical input.For the lower price this unit works exactly how I expected, no software needed. With the expensive unit, plugging in the headphones didn’t kill the speakers, so they had to be turned off separately, what a pain! With this unit plugging in the headset kills the speakers for you. The quality throgh the optical jack is stunning, VERY clear. I’m glad I got the interface I needed, and at a MUCH better proice.

Amazing sound quality for the price, but rotating the volume knob in any way causes a very loud crackling. I use this and headphones as my PC audio output so I'm constantly changing the volume depending on what media is playing, and the crackling is maddening. Sometimes it magically goes away, but I have yet to figure out the secret to reproduce it.

An extremely inexpensive DAC/AMP combo, does the job well. Build quality is really solid, knobs and switch feel sturdy and smooth. Very good product, using it to drive my HD 560s which are considered high impedance headphones, and it’s easily driving them with no issues. 5/5 star product.

And excellent value. I was using a 3.5mm to RCA splitter to feed and amp and a pair of bookshelf speakers I wanted to use to replace my B&W MM1's that finally bit the dust. I wanted a small preamp that would take USB audio from my computer and feed it to my amp with volume and tone controls. This does all of that, powers off of USB-C 5v and is pretty quite when no sound is present. Will I confuse it for my Schitt Audio preamp? No. But it is perfect for what I am doing with it. Nice clean sound in small footprint (4" wide x 3.5" deep x1.25" tall" that my computer recognized with no driver needed. I big improvement over the headphone splitter cable and no preamp. My $.02

Used it for few years now and it's been reliable and enjoyable.

I bought this as a means to fight the interference I heard due to the number of cables/wires ran behind my pc. This was my second choice, but the first one i ordered was lost in shipping so I tried for a different vendor. When it's working, it works fine, and it is nice to have the bass/treble controls if you aren't going to have them further down in your setup.I would have preferred the 1/4" headphone jack over the 1/8" as those are easier to fix when they become loose, which is what's happened to mine within a year of use. This is very odd as I was using it at work where I leave my headphones plugged in all the time. I also would have preferred a separate power switch so that I could leave the volume at my preferred level, but both of those are minor gripes.The size is great and it has plenty of power for a standard set of headphones. It completely erased any and all interference I was hearing. The fact that it's powered via USB is also nice. USB isn't enough for full on speakers, but plenty for this use, and provides the convenience of plugging into your PC. It's sad though, that it needs a separate input for power instead of feeding power from the full sized type-B port on the back.2 stars off for not even lasting a year. The solder joints on the jack look fine, so it's internal to the connector.

Purchased this amp for my DT 990 Pro (80ohms), my audio sounds way better and louder! Great size, Great quality, i also like the feedback from the knobs. All around great purchase for a budget amp.