Pros: Smooth clean bass
Cons: usb input only
Great little amp that I purchased used. Driver installs on Win8.1 and 7 with no problems. Using the D7 with my Sony MDRV6 on my work PC. Sony headphones have some foam added in the chambers. This little amp sounds really smooth over the the pc output. Running it on low gain with Bass enhancement enabled in the speakers properties. I'm using the VLC player and bass is set at 7.9db @ 60hz and the preamp set at 5.5db. Perfect settings for me to enjoy bass heavy music and not getting fatigued after 4 hours of jamming. I like it as much as the FIIO E12A. The design shows it ages, but still looks new when I received it. I recommend this little amp if you just want something better than what your PC can produce.