Benchmark HPA4 High Resolution Headphone Preamp Black

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 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.

Specifications

• 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)
• Max Input: 20 Vrms (+28 dBu)
• Max Output: 20 Vrms (+28 dBu)
• Crosstalk: < -133 dB @ 1 kHz, -116 dB @ 10 kHz
• Dimensions: 220 x 99 x 212mm, 3.62kg