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Hailed as the world’s Ultimate Line Amplifier, the Benchmark HPA4 Headphone Amplifier is the product of a collaboration between Benchmark Media Systems and THX Ltd. It is the first headphone and line amplifier to feature THX’s Achromatic Audio Amplification technology (or AAA) and reduces harmonic/intermodulation/crossover distortion by up to 40dB. The reduction is achieved by utilising a patented feed-forward topology which nullifies conventional distortion and noise mechanisms.

With the Benchmark HPA4, Benchmark and THX have produced a headphone and line amplifier capable of technically reaching maximum output and SPL without the usual side effect of distortion, delivering power, audio fidelity, speed and accuracy onto a silent canvas.

Technical Specifications

Performance
THD: < -125 dB (0.00006%)
SNR: 135 dB, unweighted, 20-20 kHz (> 131 dB THX)
SNR (A-Weighted): 137 dB (> 135 dB THX)
Frequency Response: -0.003 dB at 10 Hz, -0.001 dB at 20 kHz
Impedance: 60 Ohms (near 0 Ohms THX)
Output Noise: < 1.9 uV at Unity Gain, 20-20 kHz (< 2.45 uV THX)
Maximum Input: 20 Vrms (+28 dBu)
Maximum Output: 20 Vrms (+28 dBu)
Crosstalk: < -133 dB @ 1 kHz, -116 dB @ 10 kHz

Power
Power Supply: Internal
Typical Input Power: 18W
Max Input Power: 35W
Standby Power: 0.33W (when off)

Physical Properties
Dimensions: WxHxD 8.65 x 3.88 x 8.33″ (Including Feet)
Weight: 8.0 lbs (12 lbs shipped)

Weight 5.4 kg
Dimensions 400 × 340 × 180 mm
Brand

Finish

Black, Silver

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