The Microamp HA400 is a 4-channel stereo headphone amplifier suitable for all types of headphones. Four powerful stereo amplifiers deliver high sound quality even at maximum volume. Separate volume controls manage each channel individually. The ultra-low-noise 4580 operational amplifier ensures outstanding sound quality. A 12-volt power supply is included. High-quality components and an extremely robust construction guarantee a long lifespan for the user.