ThinkGeek offers the Fiio E1 headphone amplifier for iPhone and iPod designed to improve sound output. Equipped with Texas Instruments’ headphone amplifier integrated circuit, the device delivers high power output to drive high impedance or lower sensitivity headphones/earphones. It connects directly to iPhone’s 30-pin dock connector.
Not only works with iPhone, the E1 also supports iPod music players. Powered by iPod/iPhone, no battery is needed drive the amplifier. Fiio E1 features in-line music control and has built-in clip to clipping to your jacket, bag or purse.
The Fiio E1 is priced at $19.99.