Benchmark LA4 Silver Rackmount Line Amplifier

High-performance 2-channel preamplifier with ultra-wide frequency response and low distortion, designed for professional audio applications.

The Benchmark LA4 Rackmount Line Amplifier in silver offers precise audio amplification with two channels and exceptional fidelity. It features a frequency response extending from 0.1 Hz to 500 kHz with minimal deviation, ensuring accurate signal reproduction across a broad spectrum. The unit maintains extremely low total harmonic distortion below 0.00006% and residual output noise under 1.9 µV at unity gain. Connectivity includes balanced stereo XLR and unbalanced RCA inputs and outputs, along with 12 V bidirectional trigger inputs/outputs via 3.5 mm jacks. With a rated output of 20 Vrms at 60 ohms and a signal-to-noise ratio exceeding 135 dB (unweighted), the LA4 is engineered for demanding professional environments. Its compact rackmount form factor measures 19 x 3.5 x 8.3 inches and weighs 7.9 pounds, consuming up to 17 W during active use.

• Two-channel preamplifier with rackmount design
• Frequency response: 0.1 Hz to 500 kHz (+0/-3 dB)
• Extremely low total harmonic distortion (
• Residual output noise less than 1.9 µV at unity gain
• Inputs: 2x stereo XLR balanced, 2x stereo RCA unbalanced
• Outputs: 1x stereo XLR, 1x mono XLR, 1x stereo RCA
• 12 V bidirectional trigger input/output via 3.5 mm jacks
• Maximum input level of 20 Vrms and rated output of 20 Vrms at 60 ohms