bossarea-boss-cs-3-compression-sustainerBoss CS-3 Compression Sustainer

The CS-3 replaced the CS-2 in 1986 and has since then been the only Boss pedal compressor available. This pedal will compress high input signals and boost low input signals to produce sustain. Boosting low-input signal means that noise will be boosted at the same time so it is easy to compress the signal too much and end up with a very noisy signal.

The CS-3 has been through a chip replacement at least once in its lifetime. Early pedals used a voltage controlled amplifier (VCA) DBX1252 but it was changed to a THAT2159 some time in the early 90s. The pedal was modified for the PSA adapter in 1997.


  • Controls: Level, Tone, Attack, Sustain
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 10 mA (DC 9V)
  • Weight: 400g (15 oz.)
  • Recommended AC Adaptor: ACA (black label) or PSA (silver label)


  • Black – Made In Japan
  • Black – Made In Taiwan
  • Silver – Made In Taiwan

The CS-3 was sold from September 1986 to present.

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