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Masterclass HA-4 Headphone Pre-amplifier

The HA-4 is not only a state of the art class A headphone amplifier, it can also be used as a compact high-end pre-amplifier. The design is similar to our top of the range Sapphire DAP-800 and will drive any dynamic headphone. Featuring Sugden VCV circuit and coupled to a pure class A zero feedback mosfet output stage. The HA-4 is unconditionally load stable with a discrete constant voltage series power supply. A high input impedance ensures absolute minimal loss of signal with perfect current gain.

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Inputs ​                                  One line level input, one balanced input

Outputs                                Stereo ¼” jack socket, one line level output

Volume Control                    Manual operation


Input Impedance                   20k Ohms

Gain                                      16dB

Channel Separation             >90dB

Frequency Response           >0.3dB 20Hz-30kHz

Signal to Noise                     >95dB

Output Impedance                1 Ohm

Gross Weight  (packed)        6kgs

Dimensions                          80 x 250 x 310mm (hwd)


J E Sugden & Co Ltd, Heckmondwike, West Yorkshire.

The manufacturer reserves the right to change specifications without notice.

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