Visual Sound, Inc. The HATT4 is a Sonically Superior, Four Output Stereo Headphone Amplifier HATT4

Whirlwind Music Distributors, Inc. The HATT4's outputs deliver clean, high power signal capable of driving any modern type of earbuds or headphones. Each output is driven by a high fidelity, low distortion, class AB stereo amplifier co... The HATT4's outputs deliver clean, high power signal capable of driving any modern type of earbuds or headphones. Each output is driven by a high fidelity, low distortion, class AB stereo amplifier controlled with a front panel volume pot. Both ¼" and 3.5mm headphone jacks are provided, wired in parallel.