Designed to accompany the mono S-1000, the S-4000 consisted of a stereo preamplifier section and a single-channel 36-watt mono output (identical to the S1-000). By utilising the mono power amplifier section of the S-1000 one could create a stereo unit. Rather clunky and expensive (the S-4000 was $159 and the S-1000 $109) but the concept was not dissimilar to those of other manufacturers grappling with the conversion to stereo in the late 1950s.

By 1959, Sherwood had combined these two units into the S-5000, a 36-watt per channel stereo integrated amplifier.

For more details, read the story on the S-1000.

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