SPL Audio

HPm Dual Headphone Amp

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  • Regular price R 11,350.00



The output stage of the headphone amplifiers is designed as a push-pull amplifier in Class AB mode. The bipolar transistors share the amplification of the positive and negative half-waves, which produces a higher gain and a higher output voltage than in Class A operation, where only one transistor amplifies both half-waves.

The output stage transistors are thermally coupled and thus run particularly coherently, which contributes to a consistent and stable sound image. The power supply has a buffer circuit with low source resistance, ensuring generous current reserves even when operating low-impedance headphones. Both headphone amplifiers provide individual volume control.

STEREO/MONO/MUTE

The audio signal can be switched between stereo and mono. In the Mute position, the headphone
outputs are muted.

PHASE INVERSE Ø

With the phase inversion switch, the phase of the left or right channel can be inverted (180°).

TIP: M/S – MID OR SIDE?

By using the MONO and the phase invert switch in combination, it is possible to only monitor the
M or S signal. When “Mono mode” and phase inversion is active, only the S signal is played back.

If the phase inversion is switched off, the Mono signal corresponding to the M signal is played back. Separate monitoring of the M and S signals has become a standard for many mixing and mastering engineers.


Specifications:

Input & Output; balanced

Maximum input & output gain: 21 dBu
Input impedance: 10 
Output impedance: 150 Ω
Common mode rejection: > 82 dB
Frequency range (-3 dB): 10 Hz – 100 kHz
THD & N (0 dBu, 10 Hz – 22 kHz): 0.03 %
Noise (A-weighted): -92.3 dB
Dynamic range: 113 dB

Headphone Outputs, 1/4" (6,35 mm) TRS Jacks

Wiring: Tip = Left, Ring = Right, Sleeve = GND
Max output power (600 Ω): +18 dBu
Max output power (300 Ω): +15 dBu
Max output power (32 Ω): +5 dBu

Dimensions & Weight

Unit weight: 0.8 kg / 1.76 lbs