Power your headphones while you're on the move.
Portable headphone amps have gotten smaller, but what about the electronics inside? In making the Pico, HeadAmp set out to make a very small amp that has the voltage and current capability needed to drive headphones of all impedances and sensitivities, and a very low noise floor important for sensitive in-ear-monitors. In designing the Pico HeadAmp went through every op-amp that made sense for headphones and were convinced the Pico is the best it can be.
No amp this size that has the drive capability of the Pico.
The Pico is powered by a 2-cell lithium-polymer battery for twice the voltage, and has an internal linear smart charger. An included DC adapter supplies the power to the charger and can also power the amp. A regulator in between the DC adapter and the charger keeps the power very clean.
A 2-position gain switch is on the front panel, as is the power switch which is built into the volume control. The headphone out and line input are 3.5mm mini jacks on the front panel. The mini jacks are the highest quality I've found. Also on the front are 2 tiny LEDs, one for power and one for charging.
But the biggest attraction of the Pico may be the optional USB DAC which is unlike any portable DAC available. Still fitting in the same tiny chassis, the optional USB DAC converts USB straight to I2S and is then upsampled to 24/96 with an ASRC often said to create a jitter-free design. The DAC then runs off of the Pico's low-jitter clock instead of the USB. D/A conversion is done by Wolfson's flagship 24-bit DAC chip, the WM8740, and then passed to an analog output stage that uses a unique MOSFET op-amp.