The Benchmark HPA4 ranks #13 out of 19 total Headphone Amplifiers for sound quality. See all Headphone Amps and DACs rankings for every top pick.
Brand: Benchmark
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#13 Benchmark HPA4: $3,499.00 Benchmark Media Systems eBay
Pros: Audio Science Review measured a SINAD of 119 dB, so the amp is transparent. It has a 4-pin XLR balanced headphone output, XLR and RCA line outputs for use as a preamp, and a 256 step relay volume control with IR remote. It is rated for 441 mW into 300 ohms, ample for high impedance headphones.
Cons: Benchmark does not publish a power figure into 32 ohms, so its output into low impedance planar magnetic headphones is unconfirmed. It costs far more than the JDS Labs Atom Amp 2, which rates higher with similar measured cleanliness. It has no built in DAC.
| Balanced Output | Yes (4-pin XLR headphone, XLR line out) |
|---|---|
| Device Type | Headphone amp |
| Dimensions | 8.7” x 3.9” x 8.3” (220 x 99 x 212 mm) |
| Headphone Outputs | 6.35 mm, 4-pin XLR balanced |
| Inputs | 2 x XLR, 2 x RCA |
| Output Power (300 ohms) | 441 mW (calculated from manufacturer rated 11.5 Vrms into 300 ohms) |
| Outputs | XLR, RCA |
| SINAD | 119 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob (256-step relay attenuator, IR remote) |
| Weight | 7.9 lbs (3,600 g) |
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