FiiO E12 DIY Portable Headphone Amplifier, 20Hz-20KHz Frequency Response,16-300 Ohms Headphone Impedance, Silver Limited Edition

The FiiO E12 DIY Portable Silver Limited Edition Headphone Amplifier comes with swappable amplifier components to allow the user to mix and match them for their ideal sound.

24V High Voltage,High Current Power Supply
It comes with a high voltage, low internal resistance power circuit, with dual 11V rails (+/- 11V). The dual balanced power supply design eliminates the need for coupling capacitors, avoiding loss of audio frequencies and raising the dynamic range. High capacity 9.7Wh (880mAh/11.1V) Li-polymer battery comes with smart charging circuit that adjusts charging current dynamically according to the connected power supply's current ability. This amplifier can attain 750mW at 32ohm, 150mW at 300ohm (using OPxxx+BUFXxx combo),satisfying the power needs of most headphones on the market.

2 Simple Screws for Quick and Reliable Internal Access
Simply use the supplied hex key to unscrew the back cover and pull out the case to access the E12DIY main board.

Comes with Op-Amps for 12 Sonic Combinations
It comes with 7 high fidelity, ultra-low distortion op-amps and buffers (Including four op-amps: AD8620, AD797, OPA1611, OPA604 and three buffers: BUF634, LMH6321,LME49600) for a total of 12 different stock sonic configurations. Users can also use the supplied adapter PCBs to install other op-amps and buffers for infinite variations in sound.

User Friendly Design
High and low gains available, with high gain at +20dB available at the flick of a switch.