LA4 Benchmark

€ 3,630.00

The Benchmark LA4 is a line preamplifier with a state-of-the-art analog volume control system. At each volume setting, relays select pairs of high-precision resistors to reduce the music to the desired level. This system eliminates the noise, distortion and L/R balance issues found in more conventional analog volume control systems. Traditional potentiometers and integrated electronic volume controls are the weakest link in most Hi-Fi signal chains. The Benchmark LA4 removes the weak link while optimizing the system's noise performance at every volume setting.

The Benchmark LA4 is designed to keep noise and distortion below the hearing threshold of 0 dB SPL at any of the 256 volume control settings. No preamplifier offers a greater degree of transparency. It allows input selection and volume control without adding an “electronic fingerprint” to the music. Discover the difference! Listen to music, not electronics.

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Availability: In stock

Specifications measured from balanced inputs to balanced outputs on the Benchmark HPA4 line amplifier:

THD < -125 dB (0.00006%)
SNR > 135 dB, unweighted, 20-20 kHz
SNR > 137 dB, A-weighted
Frequency response – 0.003 dB at 10 Hz, -0.001 dB at 20 kHz
– 3 dB bandwidth exceeds 0.1 Hz to 500 kHz
Output impedance 60 Ohms
Output noise < 1.9 uV at unity gain, 20-20 kHz
Maximum input and output voltage, 20 Vrms (+28 dBu)
Crosstalk < -133 dB @ 1 kHz, -116 dB @ 10 kHz

HPA4 Benchmark Features:

256-step stereo volume control – line output
256-level stereo volume control – headphone output
Relay input selection
Two stereo balanced line inputs
Two stereo unbalanced line inputs
One stereo balanced line output
One balanced mono summary output
One balanced THX-888 XLR4 headphone output
One unbalanced THX-888 TRS headphone output
Independent control of headphone outputs and line outputs
Balance management
IR remote control
Color touch screen
Two 12-volt trigger ports

Detailed specifications!