FiiO E17K (E17) Alpen 2 Portable Headphone Amplifier USB DAC with Extreme Audio 3.5mm Stereo to RCA Cable;

FiiO E17K Alpen 2 (Upgraded E17 Alpen) USB DAC/Headphone Amplifier

The FiiO Alpen 2 E17K is a compact portable USB and coaxial digital to analog converter as well as an analog headphone amplifier for driving your favorite headphones at work and on the road.

For I/O the unit features a Micro-USB socket for charging, data exchange, and the option of docking with future desktop products. It also features a coaxial digital input with support up to 192 kHz/24-bit PCM input (via the included 3.5mm to coaxial converter plug), as well as a dual-function line in / line out for maximum convenience.

Two front panel buttons allow you to power on the unit, navigate menus on the OLED display, select the input, and lock the device. All other controls such as bass adjustment, gain level, and volume control are provided by a side mounted multifunction control wheel. The device's internal rechargeable battery provides more than 15 hours of operation on an approximately 3 hour and 40 minute charge.

Input: Micro USB, Coaxial  1/8" (3.5 mm) analog (dual function in and out)
>Output:  1/8" (3.5 mm) stereo jack (dual function in and out)
Frequency Response:  20 to 20,000 Hz
Output Power: >200 mW (32 ohm at <1% THD)
Headphone Impedance:  16 to 150 ohms
Sample Rate(USB Decoding):  96 kHz at 32 bit
Sample Rate(Coaxial Digital Input):  192 kHz at 24 bit