The HP4E professional headphone amplifier 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-inch (3.5mm) and 1/4-inch (6.3mm) headphone output for easy connectivity no adapters required. Housed in a sturdy metal chassis, the HP4E is an ideal headphone amp for any recording session.