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LA4 - Bench Test - John Atkinson, Stereophile

by Benchmark Media Systems December 23, 2019 1 min read

LA4 - Bench Test - John Atkinson, Stereophile

"Benchmark's LA4 is the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I have encountered."

- John Atkinson, Stereophile

"I measured the Benchmark LA4's performance with my Audio Precision SYS2722 system."

"The preamplifier's frequency response in both balanced and unbalanced modes was flat from 10Hz to 200kHz."

"Channel separation was simply superb, at >140dB, R–L, and >132dB, R–L, below 2kHz, respectively decreasing to 130dB and 112dB at 20kHz. The superb separation measurement is a testament to excellent circuit-board layout."

"I looked at the spectrum of the distortion at a similarly high output level; while the second and third harmonics can be seen, these are still at astonishingly low levels: each harmonic is at or below –120dB (0.0001%)."

"Tested for intermodulation distortion in balanced mode with an equal mix of 19 and 20kHz tones at peak level of 5V, the second-order difference product at 1kHz was effectively absent, and the higher-order products all lay at or below –114dB (0.0002%)."

Read more from John Atkinson's test report on the LA4 →



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