Want to get the best audio quality from your iPhone, you may need to take a look at V-Moda’s multifunctional VAMP that combines a dedicated 150mW x 2 Hi-FI amplifier, DAC (Digital-to-Analog convertor), optical audio output and 2200mAh battery into a iPhone 4/4S case. The metal case simply attach to the back of your iPhone, and turns it into a high fidelity audio device.
The VAMP’s audiophile-grade, high fidelity DAC processor can extract the digital signal of the iPhone to bypass the iPhone’s internal DAC, and its 150mW x 2 amplifier is five times more powerful than the iPhone’s amplifier , according to V-Moda. It provides two audio modes, the PURE mode that delivers audio in its original form, and the VQ mode that adds a “slight spatial 3D soundstage, tightened bass and increased treble attack that invigorates an all around sensory experience.” There are a rotary volume knob for you to finely adjust the volume and a hi/lo gain switch for adjusting the output level, as well as a S/PDIF/Toslink digital audio output.
The VAMP also serves as a protective case and a backup battery. It is built with aircraft-grade brushed metal and the shock absorbing silicone shields the iPhone from dents, breaks and scratches. The built-in 2200 mAh lithium-ion battery can provide up to 8 hours of high-quality audio playback, or it can be used as backup battery to double iPhone’s battery life.
V-Moda’s VAMP is made in Japan and it weighs 135g. It is available for $650.