Austrian Audio Full Score One
Headphone amplifier from Austrian Audio, designed to deliver precise, low-distortion listening, whether for studio use or discerning amateur listening.
Description
The Full Score One is a dedicated headphone amplifier, designed to be placed between an audio source and a pair of headphones in order to fully reveal their capabilities. It is aimed both at listeners curious to better understand their recordings and at sound engineers working in mixing or mastering contexts, where fidelity of reproduction is paramount.
Its design aims for extremely low distortion, with a THD + N rate measured at 0.0005 % at 1 kHz under a 10 Ω load, which keeps any colouration of the amplified signal to a minimum. Background noise is also very well controlled, with an EIN of 136 dB(A), meaning a residual hiss level that is virtually imperceptible even with sensitive headphones. The power bandwidth extends from 5 Hz to 2 MHz at -3 dB, and the slew rate reaches 200 V/µs with a rise time of 0.25 µs, values that reflect an ability to faithfully reproduce even the fastest transients in the signal.
On the connectivity side, the unit accepts a recommended input voltage of 1 Vrms via a 100 kΩ input impedance, and offers two 6.35 mm jack outputs as well as a balanced XLR4 output. It is designed to drive a wide range of headphones, with a recommended load between 10 Ω and 600 Ω, allowing it to suit both standard dynamic headphones and more current-demanding models.
This technical profile makes the Full Score One suited to listeners who want to get the best out of a high-end pair of headphones, as well as to audio professionals seeking a precise and stable headphone monitor for their working sessions.
Technical specifications
| Recommended input voltage | 0 dBV, 1 Vrms |
| Input impedance | 100 kΩ |
| Outputs | 2 x 6.35 mm jack, 1 x XLR4 |
| Recommended load | 10 Ω – 600 Ω, max. 150 nF |
| THD + N (1 kHz, 22 kHz, 10 Ω, 1.0 W) | 0.0005 % |
| Max. output voltage (5 Hz – 20 kHz) | 19 dBV, 9 Vrms at 0.01 % THD |
| Self noise (EIN) | 136 dB(A) / 1.5 µVrms(A) |
| SINAD (1 kHz, 22 kHz, 10 Ω) | 86 dB at 50 mVrms / 107 dB at 3 Vrms |
| Power bandwidth ( 3 dB) | 5 Hz – 2 MHz |
| Max. slew rate | 200 V/µs |
| Rise time | 0.25 µs, TTT enabled |
| Nominal line voltage | 220-250 V~ / 110-125 V~, 50 / 60 Hz |
What to check before buying used
On a headphone amplifier of this type, the 6.35 mm jack outputs and the XLR4 output are worth checking for proper function, as these are the connection points most subject to wear in use. It is also worth checking sound cleanliness across all available inputs, as well as the absence of crackling when adjusting the volume, which would indicate a worn potentiometer.
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