HP4 | Headphone amplifier


The ELBERG HP4 is a headphone amplifier with outputs for four headphones, each with volume, pan/balance, mono, and HI and LO EQ. Two AUX inputs can be used as either 2 x mono or 1 x stereo input in order to add a click track, extra effects, etc. to the main signals. On each output, the AUX signals can be muted or combined into mono. The rear panel has inputs (linked to the outputs) for the four signals. This enables chosen signals to feed a chain of HP4s, so that a greater number of headphones can be fed.


Power supply is via an (included) external AC-supply, which delivers the 2x18 VAC that the HP4 requires.


Frequency response:

10 Hz-90 kHz (-1 dB)

Harmonic distortion:

≤0.02% (+20 dBu out)

Noise (EIN):

-99 dBA

Input impedance:

20 kOhm electronically balanced (all inputs)

Output impedance:

10 Ohm

Maximum out:

+23 dBu into 600 Ohm or more 

+18 dBu into 100 Ohm


±12 dB at 10 kHz and 100 Hz

0 dBu = 0.775 V. All XLRs connected according to IEC 268-12 (1=GND, 2=HOT, 3=COLD).