The Bass Traveler from M-Audio is a two-channel, rechargeable headphone amplifier capable of powering two sets of headphones, while ensuring crisp clear sound. The unit also features an integrated “Boost” switch offering flat, medium, and high settings to optimize the sound for any headphone. The rechargeable Lithium-polymer battery offers up to 8-hours of use from a single charge. The TRRS connections are compatible with most popular in-line remote control headphones. The Bass Traveler also ships with a TRRS connection cable and a micro-USB charging cable.

The Micro DAC from M-Audio is a USB digital-to-analog (DAC) converter with two outputs�one analog and one digital. Taking the form of a slim USB stick, the Micro DAC plugs right into your computer or laptop, and, once there, transforms your digital signal into audio of a higher quality than a typical headphone jack. With the Micro DAC, you plug your headphones into the port on the side; for high-impedance headphones, you can flip a gain switch to boost the analog signal, thereby driving the volume to higher levels. An optical output can transfer pure digital signal from the Micro DAC to other digital sources.