Summary: Not too long ago I purchased a new computer and, surprisingly, discovered it has a poor sound card. I have an iTunes music library on my computer that I like listening to through my desktop speakers. The sound that was being produced just wasn't cutting it.
Pros: Great sound. Simple to set up. I definitely feel it's a 5 star product.
Summary: Got mine today the 7th of January as scheduled. A definite increase in volume and overall tone on the ATH-M50's headphone. The Audioengine D1 headphone amp is worth the investment. I'll be using the D1's analog outputs for my receiver in the very near future.
Pros: All the product features; increase in volume and improved tonal quality on both of my headphones.
Summary: Bought this because the sound card in my brand new $2.5k laptop sounds like junk. This thing is awesome. Has trouble driving my Sennheiser hd600s, But they are very hard to drive. Makes my hd380s sound incredible.
Summary: This is a great little DAC/AMP. I've used the HiFiMan HM-101 in the past and it does a great job for it's price. But this is head and shoulders above that. Immediately noticed much fuller and detailed sound through my AKG K240 MK II's.
Pros: Plenty of power (I'm not driving planar magnetic ear speakers) Detailed Uncolored
Summary: Everyone today is interested in video entertainment, and enhancements and features for that purpose. I'm sure there are still others out there, beside myself, who love music far more. I have a great audio system, including a set of Bose 901's and a pre-amp and power-amp from Emotiva.
Pros: Great value and addition for playing digital files from a computer system.
Summary: I purchased the Audio Engine D1 because of cost and also the Audio Engine reputation. Also, I knew that I could get more from my computer system than what my stock sound card could deliver. I also wanted to retrieve a audio through the USB port to keep things in the Digital domain.
Pros: A lot of Features for the money. Very Good sound in its price range. Solid Build Quality. Optical Input.
Cons: Would love to see a Pro Version with Mini-XLR out.
Summary: Great product. I bought it because my headphone port on my Macbook pro has some issues and wanted something to bypass it. This was absolutely the best remedy. The DAC is solidly made and the packaging is superior to most others. The sound quality is quite exceptional with good headphone/speakers.
Pros: Good sound, build quality, packaging
Cons: Maybe the price is bit high? I don't really care the DAC is too good.
Summary: Was very skeptical about this product but installed it on my iMac. Made a world of difference over the standard mic port. Amplifier is clean with no hum. Cleaned up the bass but especially the mid range. A little bit of a 3D quality.