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 desired input. Each channel features both a 3.5 mm (1/8") and 6.3 mm (1/4") 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.