Benchmark
HPA4
Introduced 2018$3,199 MSRP
The Benchmark HPA4 is a solid-state, dual-mono reference headphone/line amplifier built around Benchmark's own THX-AAA-888 feed-forward error-correction modules, combining the company's LA4 line amplifier with a high-current headphone stage. It functions equally as a low-distortion headphone amp and as a full-featured analog preamplifier.
MSRP
$3,199
Used market · Excellent
$2,200est.
-31% vs MSRP
as of Aug 15, 2026MSRP to used market
From $3,199 at launch to $2,200 today (estimated).
Specifications
- DAC
- None built in — designed to pair with an external DAC
- THD
- Approximately −147 dB (THX-AAA-888 chips rated near −150 dB THD)
- Inputs
- Two balanced XLR inputs and two unbalanced RCA input pairs
- Weight
- 3.6 kg / 8 lb
- Outputs
- 6.35 mm (¼") single-ended headphone jack and 4-pin XLR balanced headphone output; balanced/unbalanced/mono line outputs; two 12V triggers
- Topology
- Solid-state, dual-mono THX AAA-888 modules (patented THX Achromatic Audio Amplifier feed-forward error-correction)
- Dimensions
- 220 × 99 × 237 mm (8.65" × 3.47" × 9.33", W×H×D, including knobs/connectors)
- Power output
- Up to 11.9V RMS into 300 Ω; up to 6 W into 16 Ω; max output current 1.5A; max output voltage 11.5V RMS
- Gain volume range
- +15 dB to −122/−127.5 dB in 0.5 dB steps (286-step volume control); input boost/cut of ±10 dB
- Frequency response
- 0.01 Hz to over 500 kHz (measured lab report: +0.0/−0.0 dB 20Hz–20kHz, +0.01dB at 100kHz)
- Signal to noise ratio
- 103.3 dB (A-weighted), both line and headphone outputs
Active listings (0)
No active listings for this component right now.
Similar but better
Matched by the Audiophilia engine on character, specs and market position.
Peers
Benchmark Media Systems · headphone-amplifiers
HPA4
$2,550$3,599
- A close peer to this component
LAB12 · headphone-amplifiers
hpa
Price on request
- A close peer to this component
Pass Labs · headphone-amplifiers
HPA-1c
Price on request
- A close peer to this component
Enleum · headphone-amplifiers
HPA-23RM
$2,625$3,000
- A close peer to this component
