Benchmark LA4 Line Amplifier Preamplifier Preamp Black With Remote
$2,000
Posted about 18 hours ago in Gardena, CA
Condition: Used (normal wear)
Listed in categories: Electronics & Media - Audio & Speakers
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Price is FIRM Serious buyers only. Please. NO trades Up for sale I have a Benchmark LA4 Line Amplifier Preamplifier Preamp in Black With Remote. Unit works perfectly and has no issues. Will ship in original box witu manual and all accessories. The LA4 is an all-analog line-level preamplifier that is designed to sit between a reference-quality D/A converter and a reference-quality power amplifier. No line-level preamplifier offers lower noise or lower distortion. Benchmark's flagship LA4 delivers the highest performance available at any price. The LA4 features a 256-step, fully-balanced, relay-switched volume control system. All inputs and outputs are fully-buffered with low-noise low-distortion balanced amplifiers. Every audio function is relay controlled in order to achieve the highest possible performance. The LA4 is an all-analog line-level preamplifier that is designed to sit between a reference-quality D/A converter and a reference-quality power amplifier. No line-level preamplifier offers lower noise or lower distortion. Benchmark's flagship LA4 delivers the highest performance available at any price. The LA4 features a 256-step, fully-balanced, relay-switched volume control system. All inputs and outputs are fully-buffered with low-noise low-distortion balanced amplifiers. Every audio function is relay controlled in order to achieve the highest possible performance. The LA4 is currently shipping from stock. Overview The Ultimate Line Amplifier 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 it 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. The LA4 is identical to the HPA4 except that it eliminates the headphone outputs. The LA4 is ideal for customers who do not need a headphone amplifier. 100% Analog Signal Path The LA4 is 100% analog. It is designed to be driven from external D/A converters and external line-level analog sources. The LA4 is designed to drive any professional or hi-fi power amplifier. The LA4 provides the ultimate analog signal path between inputs and outputs. The LA4 eclipses the performance of typical high-end hi-fi preamplifiers by achieving much lower noise and distortion. System Optimization At any volume setting, the relay-controlled gain stage provides an optimized attenuator to match the upstream analog source to the downstream power amplifier. This optimization of the gain staging delivers the best possible system SNR for each volume setting. The LA4 will match high-output D/A converters to low-input power amplifiers and vice-versa. It will also provide an optimized interface to and from balanced and unbalanced devices. In addition, it will match high-level professional balanced interfaces to low-level hi-fi balanced interfaces (in either direction). Speed and Precision The bandwidth of the LA4 extends from 0.01 Hz to over 500 kHz. This means that the LA4 delivers very precise amplitude and phase accuracy over the entire audio bandwidth. Wave shapes are accurately reproduced, and the entire spectrum is delivered with precise timing. The LA4 will deliver musical overtones with life-like accuracy. This means that musical instruments are rendered without changing their sonic character. Balanced and Unbalanced I/O The LA4 features two balanced stereo inputs and two unbalanced stereo inputs. The line amplifier provides one balanced stereo output, one balanced mono sum, and one unbalanced stereo output. System Integration The LA4
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