BENCHMARK HPA4 Preamplifier Headphone Amplifier Silver

Photo of 3/4 face of BENCHMARK HPA4
This Benchmark HPA4 preamplifier/headphone amplifier is based on the brand's proprietary amplifier for amplification of its line outputs and THX-888 AAA™ (Achromatic Audio Amplifier) technology from THX for its headphone amplification. This technology enables it to achieve exceptional measurement levels with very low levels of noise and distortion for near-perfect linearity.

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BENCHMARK HPA4 Balanced Preamplifier Headphone Amplifier THX AAA 888 Silver

Picture of BENCHMARK HPA4

This Benchmark HPA4 preamplifier / headphone amplifier is based on the brand's proprietary amplifier for amplification of its line outputs and THX-888 AAA™ (Achromatic Audio Amplifier) technology from THX for its headphone amplification. This is the same technology used for the brand's AHB2 power amplifier. This technology enables it to achieve exceptional measurement levels with very low levels of noise and distortion for near-perfect linearity. This preamplifier / headphone amplifier also features high power handling, making it compatible with most headphones on the market, whatever their impedance. The HPA4 uses an all-analog circuit design and is therefore intended to work in conjunction with a DAC or external analog source. The front panel features a touchscreen for easy access to parameters and settings. In terms of connectors, it features 2 balanced XLR stereo inputs and 2 RCA stereo inputs with RCA and XLR stereo outputs. In addition, there are two 12 V 3.5 mm jack trigger connectors, one XLR mono output and two headphone outputs: 6.35 mm jack and 4-pin XLR.

BENCHMARK HPA4: a powerful headphone amplifier

THX-888 technology is capable of delivering high voltage and driving high-impedance, low-sensitivity headphones. The HPA4 delivers up to 11.9Vrms at 300 ohms and up to 6W at 16 ohms. Considering the extreme capabilities of its amplifier, Benchmark has integrated protection systems to protect your equipment (DC current detection, short-circuit detection, overcurrent protection, overvoltage protection and thermal protection).

BENCHMARK HPA4: wide bandwidth

The HPA4 features a bandwidth extending from 0.1Hz to 200kHz. This makes it a headphone preamplifier/amplifier capable of reproducing an extremely detailed and precise signal.

BENCHMARK HPA4: meticulous appearance and usability

The HPA4's front panel touchscreen provides easy access to settings such as balance control, input level shifts, input names, screen brightness and function lock. A volume control knob features a high-quality optical encoder and 256 volume levels with 0.5dB/step resolution. Pressing this volume knob selects the desired output. In addition, a remote control enhances the user experience.

Benchmark HPA4 overview

BENCHMARK HPA4 connection diagram
12x Stereo RCA input
2RCA stereo output
32x Trigger 12V jack 3.5mm
42x Balanced XLR stereo input
5XLR Mono output
6Balanced stereo XLR output
7IEC power supply

Benchmark HPA4 review by Audio Science Review (Amir)

Going into this test, based on measuring previous Benchmark products, I expected excellent performance. The benchmark HPA4 shattered even that high bar. It brings such a high performance to the table that leaves no doubt whatsoever about its transparency. No stone has been left unturned to optimize audio performance of this device. Even obscure measurements like ultrasonic interchannel phase shift is nailed.
And then we have tons of power without messing with balanced cables and such. Plug in any headphone and you are in heaven.
The preamp performance is even higher still, breaking and shattering any expectation one would have in a lab instrument let alone a consumer hi-fi.
It goes without saying that the Benchmark HPA4 garners my strongest recommendation for a headphone amplifier and preamplifier. It doesn't get better than this folks."

Technical characteristics

Specifications
Product typePreamplifier
Headphone amplifier
Amplification technologyTHX-888 (AAA™) and low-noise line amplifier
Inputs2x RCA stereo input
2x XLR balanced stereo input
Ouputs1x Stereo RCA output
1x XLR stereo balanced output
1x XLR mono output
1x 6.35mm headphone output
1x XLR balanced headphone output
Bandwidth0.1Hz - 500kHz
SNR>135dB
THD<125dB
ScreenTouch screen
Trigger2x jack 3.5mm 12V bi-directionnel
HEADPHONE OUTPUT MEASUREMENTS (+24DBU INPUT)
THD< -125 dB (0.00006%)
SNR> 135 dB, A-weighted
Frequency response- 0.003 dB à 10 Hz, -0.001 dB à 20 kHz
Bandwidth-3dB exceeds 0.1Hz to 500kHz
Output impedanceNear 0 ohm
Output noise< 2.45 uV at unity gain, 20-20 kHz
Maximum output power6W into 16 Ohm
Maximum output current1.5A
Maximum output voltage11,5 Vrms into 300 Ohms
Crosstalk< -133 dB à 1 kHz, -115 dB à 10 kHz (XLR4)
LINE OUTPUT MEASUREMENTS
THD< -125 dB (0.00006%)
SNR> 135 dB, unweighted, 20-20 kHz
> 137 dB, A-weighted
Frequency response- 0.003 dB à 10 Hz, -0.001 dB to 20 kHz
Bandwidth-3dB exceeds 0.1Hz à 500kHz
Ouput impedance60 Ohms
Output noise< 1.9 uV at unity gain, 20-20 kHz
Maximum input and output voltage20 Vrms (+28 dBu)
Crosstalk< -133 dB at 1 kHz, -116 dB at 10 kHz
General
Power supply100-240V AC 50/60Hz
Power consumption18W (Typ.)
35W (max.)
Standby power consumption0.33W
Dimensions203.2 x 76.2 x 203.2mm
Weight3.65Kg
ColorSilver front / Black body
Package1x Preamplifier Headphone amplifier HPA4
1x Remote control
1x Power cable
 
Data sheet
InputXLR
InputRCA
OutputRCA
OutputJack 6.35mm
OutputXLR
ColorBlack
ColorSilver
ClassN/A
Remote ControlYes
 
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BENCHMARK HPA4 Balanced Preamplifier Headphone Amplifier THX AAA 888 Silver
This Benchmark HPA4 preamplifier/headphone amplifier is based on the brand's proprietary amplifier for amplification of its line outputs and...

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