The HP4E professional headphone amplifier from AKG features two stereo input and four stereo output channels of high-quality audio. Designed for ease of use, convenient switches on the front plate enable you to select your designed input. Each channel features both a 1/8" and 1/4" headphone output for easy connectivity with no adapters required. Housed in a sturdy metal chassis, the HP4E is an ideal headphone amp for any recording session.