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Benchmark LA4 Line Amplifier
View All / Benchmark LA4 Line Amplifier

Benchmark LA4 Line Amplifier

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Overview


The LA4 is a line-level preamplifier that is designed to sit between a reference-quality D/A converter and a reference-quality power amplifier. This is not an easy task. Most hi-fi preamplifiers introduce significant noise and distortion due to the necessity to provide volume control and input switching. To solve this problem, the LA4 is completely relay controlled and features analog amplifiers with vanishingly low distortion. It features relay gain control, relay input selection, and relay muting. The entire system incorporates the finest gold-contact relays available. The gain control has 256 steps in 0.5 dB increments. It also features a relay-controlled balance adjustment. Relay closures are precisely timed to deliver silky-smooth volume changes. No other relay gain control offers this level of precision or performance. The LA4 includes 2 independent 256-step attenuators: one for the left channel and one for the right channel. To make this all happen, the LA4 includes a total of 40 precision relays that switch high-precision metal-film resistors.

Features


  • Benchmark Low-Noise Line Amplifier
  • 256-Step Fully-Balanced Relay Gain Control, 0.5 dB Steps
  • Precision Timed Relay Closures
  • Precision Metal Film Resistors
  • Gold-Contact Relays
  • Balanced and Unbalanced I/O
  • 0.01 Hz to 500 kHz
  • SNR > 135 dB
  • THD < 125 dB (0.00006%)
  • Touch Screen Control
  • IR Remote Control (optional)
  • 2 Balanced Stereo Line Inputs
  • 2 Unbalanced Stereo Line Inputs
  • 1 Balanced Stereo Line Output
  • 1 Unbalanced Stereo Line Output
  • 1 Balanced Mono Sum Output
  • 2 Bidirectional 12V Trigger Ports

Specifications


(using balanced inputs at +24 dBu)

Balanced Line Outputs:
  • 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

Dimensions:
21.9cm W x 9 .8cm H x 21.1cm D (Including Feet)

21.9cm W x 8.8cm H x 21.1cm D (Excluding Feet)

Weight:
3.6kg

Power:
  • 12W Typical Input Power
  • 17W Maximum Input power
  • 0.33 W Standby Power (when off)
  • Internal Universal Power Supply

Delivery Options

  • S.F. Express - Office / Home Delivery
  • S.F. Express - EF Locker Pickup
  • S.F. - Business Station
  • S.F. Express - Store Pickup
  • S.F. Express (Macau)
  • Self Pick-up (Lai Chi Kok)
  • N/A*

Payment Options

  • AlipayHK
  • FPS QR CODE/ TAP&GO
  • Octopus Card / Octopus Wallet
  • WeChat Pay HK
  • Visa / MasterCard Credit Card
  • UnionPay
  • Apple Pay
  • Payme
  • PayPal & Credit Card
  • Bank Transfer／ATM
  • Combine Multi-payment Method
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