PreSonus HP2 Stereo Headphone Amplifier From PreSonus: Designed for musicians and performers who demand mobility without compromising audio quality, the HP2 personal headphone amplifier is a great choice for driving wired in-ear monitors (IEMs), as well as headphones. PreSonus HP-series headphone amplifiers have long been popular for their loud, clean, clear sound and roadworthy built quality.
