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Reference listening systems: the sound how it is, not how it should be.
Audio heaven in a pocket: Fully differential design professional headphone amplifier.

The reference headphone amplifier has been designed to faithfully reproduce the most subtle nuances contained in the musical message with the maximum detail and sobriety.

Two independent channels with independent power supplies for best channel separation and wider stereo image, fully differential (balanced) circuitry for improved linearity, dynamic response and definition, making the membrane much more prompt to signal solicitations.
Virtually immune to interference and noise, even in difficult environments.

Current drive: in the dynamic transducers, it's the current flowing through the voice coil which produces the magnetic field which interacts with the magnetic field of the magnet in the driver that causes the diaphragm to move back and forth. Thus a constant current amplifier has several advantages over the usual constant voltage amps: A current source amplifier delivers a precise current to the voice coil of the loudspeaker driver, ignoring the series impedance elements in the circuit, including the wire, connectors, the inductance of the voice coil, the resistance of the voice coil versus temperature, and so on, delivering higher accuracy and linearity.

A fully balanced system involves the use of: the amplifier (our main unit) and a special balanced cable, not included. (Headphones must be recabled).

The components used are all selected with the strictest tolerance, and tested by ear.

HPBA-2 Balanced headphone amplifier HPBA-2

Studio reference headphone balanced amplifier
Fully differential solid state high definition circuitry
Dual mono construction
Current Drive
Two independent channels for better channel separation
Two filtered and regulated independent power supplies
Independent volume controls for each channel
Fully balanced (symmetrical) low impedance noise free output
24-step precision rotary controls with gold plated contacts
Fully differential audio signal path
Frequency response absolutely flat over the entire audio range and beyond

Technical data Download the brochure

Frequency response: 1.5Hz—850KHz (-3dB)
C.M.R.R. ›60dB
Signal/noise ratio at 20dB 22Hz/22KHz 300Ω terminated: ›100dB
Maximum output level (300Ω) : +11.5dBm (can be modified on request)
Input impedance: 20KΩ
Output impedance: 164Ω
Min. load impedance: 200Ω