![]() We seriously cannot say enough about the sound, quality, features, and uniqueness of HPA4. A 0.25-inch TRS and four-pin XLR output, re-namable inputs (two balanced and two unbalanced), two bi-directional 12V trigger ports, a balanced stereo output, balanced mono sum output, and unbalanced stereo output augment premium casework with a milled faceplate and sides that join aluminum top, bottom, and rear panels. You've also likely noticed HPA4 has an easy-access touchscreen and high-quality optical encoder on the volume knob. Onboard DC detection, short-circuit detection, over-current protection, over-voltage protection, and thermal protection guard against any possible issues with your ‘phones or HPA4 itself. Four independent 256-step attenuators – two for the left and right headphone outputs, two for the left and right line outputs – combine with a total 64 precision relays for the ultimate in control.Īble to provide 11.9 Arms into 300 ohms and six watts into 16 ohms, HPA4 arrives equipped to more than capably drive by high- and low-impedance 'phones. A 256-step volume control complements a balance control while relay closures supply silky smooth volume changes. Inside, a Benchmark line amplifier with relay gain control, relay input selection, relay muting, and gold-contact relays drives the THX-888 amplifier. By incorporating the same THX AAA (THX-888) amplifier employed in Benchmark's acclaimed AHB2 power amplifier, HPA4 achieves its maximum output power and sound pressure level without producing the distortion that traditionally accompanies increased output levels. ![]() Its precision and silent operation are simply off the charts.ĭesigned to be driven by an external DAC or analog source, The Absolute Sound Product of the Year Award-winning HPA4 aims to supply a peerless analog signal path between inputs and outputs. This U.S.A.-tested and -built component exemplifies power, speed, fidelity, and accuracy – and dead-silent backgrounds that will allow you to hear the pristine nuances, tonal textures, sustained notes, and wide-ranging dynamics that make music truly come alive. The world's most linear headphone amplifier: That's the all-analog Benchmark HPA4 line preamplifier in a nutshell, the result of patented feed-forward topology that nulls conventional distortion and noise – in addition to featuring THX AAA (Achromatic Audio Amplifier) technology that reduces harmonic, intermodulation, and crossover distortion by 20 to 40dB. Linear Headphone Amplifier Delivers Reference Speed, Accuracy, and Fidelity: All-Analog Benchmark HPA4 Features Distortion-Free Performance, 256-Step Volume Control
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