High-performance 2-channel line amplifier preamplifier with ultra-wide frequency response and extremely low distortion, designed for professional audio applications.
The Benchmark LA4 is a precision 2-channel line amplifier preamplifier engineered for professional audio environments. It delivers exceptional audio fidelity with a frequency response spanning from 0.1 Hz to 500 kHz (+0/-3 dB) and a flat response of 10 Hz to 20 kHz (+0/-0 dB). The unit features ultra-low total harmonic distortion below 0.00006% and minimal residual output noise under 1.9 µV at unity gain. Connectivity includes balanced stereo XLR and unbalanced stereo RCA inputs and outputs, along with 12 V bidirectional trigger I/O via 3.5 mm jacks. The LA4 supports a maximum input level of 20 Vrms and provides a rated output of 20 Vrms at 60 Ohms impedance. Its signal-to-noise ratio exceeds 135 dB unweighted and 137 dB A-weighted, with crosstalk below -133 dB at 1 kHz. Power consumption is efficient, with 12 W active and 0.33 W standby. The amplifier’s compact chassis measures 19 x 3.5 x 8.3 inches and weighs 7.9 pounds, making it suitable for integration into professional audio systems.
- 2-channel line amplifier preamplifier with balanced and unbalanced I/O
- Frequency response: 0.1 Hz to 500 kHz (+0/-3 dB), 10 Hz to 20 kHz (+0/-0 dB)
- Extremely low total harmonic distortion: less than 0.00006%
- Residual output noise below 1.9 µV at unity gain
- Maximum input level of 20 Vrms with rated output of 20 Vrms at 60 Ohms
- Signal-to-noise ratio greater than 135 dB unweighted, 137 dB A-weighted
- Crosstalk under -133 dB at 1 kHz and -116 dB at 10 kHz
- Rear panel includes 2x stereo XLR balanced and 2x stereo RCA unbalanced inputs
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