DacimoraHigh-Fidelity 16-300 Ohm Headphone Amplifier preamplifier Stereo Headphone Amplifier with 8-Level gain Switch Adjustment Supports USB-C/3.5MM Input 3.5/4.4mm Headphone Output

It's nice that it has battery power however Lacks output for my over ear headphones perhaps too high of impedance

I opened this today to use in my car as the audio from my phone is quiet when playing music. First thing I noticed is that the pictures they show don’t show how the amp charges. There is a port on it that they don’t show. Also that port that is used for charging the charge cord doesn’t go in all the way as you can see from my picture. Unit came charged so until it needs charging I won’t know if this will be an issue or not. I’ll update as I use it. Also the charge light that is supposed to light up when it’s charging is not an LED or anything it seems like it’s just a red piece of plastic in a hole. So far not that impressed with the quality. But I’ll do an update when I actually use it. So far the unboxing made me a little worried.UPDATE::So far it hasn’t needed a charge so we will see about when that time comes. But I did try it. It works ok with music. But if you try to use it say through headphones watching a movie or tv you CANT hear the voices of the actors at all. Very disappointed.UPDATE 2:: Needed charging but the quality of this is so poor that it wouldn’t charge or light up when charging. Do yourself a favor and look elsewhere. I’m returning today.

This little headphone amp with a built-in DAC really surprised me. It's extremely clean, offers an impressive signal-to-noise ratio and low harmonic distortion, and functions as an excellent audio source next to my computer. I was able to get it up and running in a few minutes and as soon as I turned on the volume switch, it showed up as a new device ("GV-HD AUDIO") in my audio settings (running Windows 11).The amp comes with a very short manual, but lists enough specifications to compensate for that. The max power output is listed at 50mW/100mW, based on the gain switch selected, which are high enough levels that you should not be listening at full volume for your hearing safety. For folks with fancy balanced headphones, it offers a balanced 4.4 mm output in addition to the standard 3.5 mm headphone output. Unfortunately, I don't have a balanced headphone with a 4.4 mm connector, so I can't speak to the difference in sound quality with that. However, with the standard 3.5 mm, I tested 24/48, 24/96 and 24/192 lossless music files, and the DAC did not have any problems at all. (I've also not tested the analog input, since going directly to DAC with the USB-C cable provides the cleanest signal.)I would really like to know what DAC chip is used inside, but I didn't want to mess with the screws and damage the cool aluminum case. I hope the company will add that info to their listing. In the meantime, treat this amp as one of the best hi-fi values around these days. It offers a superb bargain, and is highly recommended!

It's not filled with lead but it feels like it could be. This little DAC is heavy for its size. I typically like taking a DAC with me for live streams on the go. But most DACs are kind of big and chonky because they have a couple of XLR ports on them. This little guy is all USB-C, Mini, 3.5mm, and 4mm so it is very slim.In the box is the DAC, a USB-A to USB-C cable, a USB-A to USB-Mini cable, a 3.5mm to 3.5mm audio cable, and a brief manual.The majority of this DAC's weight is going to be shared by its metal housing, components, and it's internal rechargeable battery. I didn't know it had a rechargeable battery until I took it out of the box and turned it on by messing with the volume dial. Nice. Wasn't sure why I would want that feature but I suspect that it is for people using this with either a tablet or cellphone where there isn't going to be any USB power. Speaking of USB power, that is where the USB-A to USB-mini cable comes in. I guess they didn't want to have both ports on the back mixing, so USB-C for an audio connection and the Mini for power only. Not sure why they didn't use a combo USB-C (power and data) but I'm not a DAC engineer or it it could be for sound interference isolation. The audio input source can also be a direct line 3.5mm into the back of this unit as well. It doesn't have to be USB.On the front i/o is the 3.5mm audio jack, the volume knob, a power LED, and a 4mm audio jack. What the Hell is a 4mm jack? Well after going down that rabbit hole, I learned that I wasn't as much of a audiophile as I thought. The TLDR of that is about only two dozen studio headphones use that standard and they are pricey. Plus 4mm is suppose to be a super-balanced audio source that is just the best, so they say.I will just stick with my slightly overpriced Audio-Technica ath-m50xBT for my sound tests. My laptop had no issues recognizing the DAC and setting it up. I am running a pretty good gaming laptop which tend to have really good built in sound cards. I was expecting for a similar performance from both devices. I played some music with a tiny bit of EQ bias in the Treble and Bass for the first laptop test at 75% volume. The internal laptop card sounded like it should and the way I had set it. Test 2 with the DAC, I started by setting the Gain switch on the back to Low first, set the laptop volume to 50%, set the EQ to Flat, and the DAC to volume 1. I started up the music and once I got to 5 on the volume it was as loud, if not a bit more, than the laptop set at 75% volume. The sound quality was better at a Flat EQ with the DAC than the bias towards Bass and Treble I had on the laptop card.This thing has definitely got something positive going on with it with its internals. At 100% laptop volume and a volume of 10, I'm pretty sure it would've been either be deafening or damaging to the headset. So careful while playing with it.It is a really good product that I am glad I got and I plan on playing with it a bit more to see what it's full levels are. I might even do more researching on the 4mm audio standard and get one of those headset in the future. Definitely a good pick up especially starting out of budget, 5 stars.