Damping factor, in conjunction with output impedance, is a measure of an amplifier stage's ability to correctly control the headphone driver's diaphragm (the element that moves and so creates sound). Adjusting the damping factor for a given pair of headphones will allow a reduction in distortion and a flatter frequency response. Low end Headphone Amplifiers don't offer such flexibility but the HA-501 provides five user-selectable Damping Factor settings.

With a frequency range of 2Hz-100kHz and 1,400mA of output power per channel (at 32 ohms impedance) the HA-501 has more than enough current drive capability not only for the majority of regular headphones (with an impedance range between 80-250 ohms) but also more esoteric, high-end 600 ohm designs. And if you do have several headphones an auto-muting function will ensure you don't get deafened when switching between models with different impedances.

A lavishing Class-A Amplifier for superior sound quality. (Full-analog Dual Monaural Discrete design)

Active DC Servo Technology to eliminate Offset Electrical Potential, to achieve stable drive

Switchable Damping Factor, to dive diaphragm under the best conditions. (5 positions)

1,400mA/ch (32 ohm loaded) of high output power to drive a high impedance headphones as high as 600 ohms

A Toroidal-Core Power Transformer for stable current supply

Full-metal jacket. Gorgeous aluminum panels for front top and sides. Small footprint fits your desktop.