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LA4 Review - Kalman Rubinson, Stereophile
LA4 - "Put a Big Smile on My Face"
"As soon as everything powered up, there was a big smile on my face. With the LA4 in control of the system, everything sounded right, and subtle differences among recordings, amplifiers, and speakers were clear."
"Compared to the other preamps on hand, the LA4 was consistently quieter, more open, and more revealing of detail."
"The action of the large knob is stepped, and an audible relay click accompanies each 0.5dB step change. I am accustomed, as perhaps many are, to smooth, silent operation, and I hastily concluded that the clicking would be intolerable. Nevertheless, I was wrong, especially as this construction contributes to some of the virtues I observed later."
"The LA4's 16-step gain stage feeds a 256-step attenuator with 12 gold-contact relays and 64 precision (0.1%) thin-film resistors, switched by an array of 40 sealed, gold-contact precision relays."
"The use of physically large, metal-film resistors ensures rapid heat dissipation, preventing heat-induced increases in resistance values."
"The relays are controlled by an FPGA to ensure precise timing of relay switching, which Benchmark says reduces transient currents that can cause pops, clicks, and 'zipper noise.'"
"The LA4's design, the company says, ensures long-term, low-distortion, low-noise operation with accurate interchannel balance and repeatability. It also means that one can use multiple LA4s and know that they are accurately matched."
"The LA4 is probably the most transparent and revealing audio component I've ever used."
"It does not seem to leave any fingerprints on the sound. It has a useful array of inputs, outputs, and functions, and the use of sealed relays for volume and input selection assures a long and noise-free life."
- Kal Rubinson, Stereophile
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"In his listening room, Kalman Rubinson compared the LA4 to a cable—and couldn't hear any difference. He concludes, 'the LA4 is probably the most transparent and revealing audio component I've ever used. It does not seem to leave any fingerprints on the sound.'"
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