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Benchmark Media Systems HPA4 Pre Amplifier Benchmark HPA4 Preamplifier/headphone amplifier in excellent condition with original box, manual etc. Best headphone amplification I have used. Having two sets of XLR inputs and two sets of RCA inputs is helpful. The XLR and RCA outputs can be used simultaneously (eg to drive subwoofers). Individual unit photos as well as driving a pair of AHB2 power amplifiers also for sale individually.    Manual is here: https://cdn.shopify.com/s/files/1/0321/7609/files/HPA4_Manual_-_REV_C.pdf?76   See also: https://www.heynowhifi.com.au/products/benchmark-hpa4-hea

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About Benchmark Media Systems

Benchmark Media Systems traces its roots to 1983, when founder Allen H. Burdick launched the company as Benchmark Sound Company from a garage in Dallas, Texas. Burdick, a lifelong audio enthusiast, built the brand around meticulous engineering principles, evolving it into a dedicated hi-fi operation. Today, headquartered in Syracuse, New York, where it engineers, manufactures, and ships products, Benchmark upholds over four decades of American craftsmanship focused on precision audio reproduction.

The company specializes in a focused lineup of high-performance components, including flagship digital-to-analog converters like the DAC3 series, transparent preamplifiers such as the LA4, and the acclaimed AHB2 power amplifier—named in honor of Burdick himself. This streamlined portfolio avoids speakers, turntables, headphones, or cables, concentrating instead on core electronics that prioritize signal integrity and minimal distortion.

Benchmark occupies a premium niche in the hi-fi market, revered by discerning audiophiles and measurement enthusiasts for its exceptional transparency, low noise, and top-tier objective performance. Positioned as a high-end boutique brand, it appeals to buyers who demand verifiable excellence over hype, consistently outperforming competitors in rigorous testing while delivering reliable, no-compromise sound.

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