This is a Demo item, meaning it was used on a showroom floor so it is being sold at a reduced price. It may come without original packaging and may have minor blemishes. Some rack units may have deeper scratches on the chassis.
The HA660 allows to to achieve a speaker-like working environment over headphones. Headphones give you a 180 "super-stereo" image, but music is typically mixed on speakers, in an equilateral triangle orientation, so what you hear on headphones isn't the way the mix engineer intended for it to be heard. With the HA660, you can hear it the way it is meant to be heard, without the need for speakers!
Similarly featured headphone amps cost over $800, but with the HA660 it can fit the budget of any studio.
Premium stereo headphone amplifier
Rich audio signal with low distortion and self noise
Ease-of-use, 3 different input connector