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Benchmark LA4 Reference Line Preamplifier

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Benchmark LA4 Reference Line Preamplifier

LA4 is a stripped down 'line-amplifier only’ variant on Benchmark Media’s HPA4 headphone amplifier and is designed to bridge the gap between reference quality converters and power amplifiers. Armed with relay gain control, relay input selection and relay muting all via the finest gold-contacts available, the LA4 is able to keep distortion and noise minimal across the full range of volume stages.

Each gain control features 256 steps in 0.5dB increments - one for then input gain and two for outputs (left and right). The precise timing of each relay closure ensures that each attenuator delivers a silky-smooth volume curve for ultimate delivery and performance.

The LA4 is a perfect partner for Benchmark sister products such as the DAC3B or any converter without analogue line outputs.

Benchmark LA4 Reference Line Preamplifier

More Information
Manufacturer Link Benchmark LA4 Reference Line Preamplifier
Manufacturer Benchmark
Free warranty 3 years
Delivery Charge Free
Delivery Time Normally 1 - 5 Working Days (Covid-19 and Brexit Delays Possible, contact us for more information)
Card Surcharge No
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Benchmark LA4 Reference Line Preamplifier

Main Features

  • Remote Control (sold separately)
  • Low-Noise Line Amplifier
  • 256-Step Fully-Balanced Relay Gain Control
  • Precision Timed Relay Closures
  • Precision Metal Film Resistors
  • Gold-Contact Relays
  • Touch Screen Control
  • 2x Balanced Stereo Line Inputs
  • 2x Unbalanced Stereo Line Inputs
  • 1x Balanced Stereo Line Output
  • 1x Unbalanced Stereo Line Output
  • 1x Balanced Mono Sum Output
  • 2x Bidirectional 12V Trigger Ports


< -125 dB (0.00006%)
SNR > 135 dB:
20-20 kHz (unweighted)
Frequency response:
-0.003 dB at 10 Hz, -0.001 dB at 20 kHz
60 Ohms
< 1.9 uV at Unity Gain, 20-20 kHz
Max voltage:
20 Vrms (+28 dBu)
< -133 dB @ 1 kHz, -116 dB @ 10 kHz

Physical Properties

220 x 99 x 212mm (WxHxD inc feet)


Typical input power:
Max input power:
Standby power:

Benchmark LA4 Reference Line Preamplifier