CS-3Compression Sustainer

CS-3

Classic Compression, Smooth Sustain

Countless guitarists trust the CS-3 Compression Sustainer for its smooth sound and outstanding versatility. From subtle dynamics control to rich, clean sustain, this blue BOSS classic provides exceptional balance and articulation, whether playing rhythm or lead. Level, Tone, Attack, and Sustain knobs offer precise, intuitive operation and the ability to shape your sound for any musical style. In continuous production since 1986, the CS-3 is a go-to staple for players seeking natural-sounding compression.

Features

  • Classic analog compressor pedal favored by guitarists for decades
  • Provides natural compression and rich sustain without adding distortion
  • Attack and Sustain knobs shape dynamics with clarity and smoothness
  • Tone knob for adjusting the high-frequency response
  • High-performance VCA circuit delivers stable, balanced sound
  • Low-noise design for transparent operation
  • BOSS five-year warranty
CS-3

Fluid Operation

Compression evens out volume by reducing loud signals while boosting soft ones, and the CS-3’s Attack knob determines how quickly the circuit reacts. Turning it clockwise preserves string attack for a snappier, more percussive sound, while counterclockwise settings provide progressive control over signal spikes. Twisting the Sustain knob increases the amount of compression, allowing you to tighten the sound and produce natural sustain without distortion.

CS-3

Precision Dynamics Control

The CS-3 features a high-performance VCA circuit that delivers stable, consistent compression with very low noise. Renowned for its distinctive character and well-balanced response, the pedal maintains clarity across all playing styles. It excels at everything from hot country licks and punchy power chords to singing solos, making it an essential tone-enhancing tool.

CS-3

Tonal Versatility

The Tone knob adds another layer of versatility by shaping the EQ of the compressed signal. Higher settings enhance the treble for a sharper, more cutting tone—perfect for chimey arpeggios, funk rhythms, and parts that need to stand out. Rolling it back softens the highs, creating a warm, mellow voice that suits genres like jazz and neo soul. Whether you need some extra bite or a smoother feel, the CS-3 helps you sculpt your sound to match the music you’re playing.

Specifications
Nominal Input Level
-20 dBu
Input Impedance
1 M ohm
Nominal Output Level
-20 dBu
Output Impedance
1 k ohm
Recommended Load Impedance
10 k ohms or greater
Bypass
Buffered bypass
Controls
SUSTAIN knob
ATTACK knob
TONE knob
LEVEL knob
Pedal switch
Indicator
CHECK indicator (Serves also as battery check indicator)
Connectors
INPUT jack: 1/4-inch phone type
OUTPUT jack: 1/4-inch phone type
DC IN jack
Power Supply
Carbon-zinc battery (9V, 6F22) or Alkaline battery (9V, 6LR61)
AC adaptor (PSA series: sold separately)
Current Draw
20 mA
Expected battery life under continuous use
Carbon: Approx. 10.5 hours
Alkaline: Approx. 26 hours
*These figures will vary depending on the actual conditions of use.
Accessories
Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTES," and "Information")
Dry battery/9 V type (6F22)
Options (sold separately)
AC adaptor: PSA series
Size and Weight
Width
73 mm
2-7/8 inches
Depth
129 mm
5-1/8 inches
Height
59 mm
2-3/8 inches
Weight
380 g
14 oz
* 0 dBu = 0.775 Vrms
* The specifications are subject to change without notice.

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Support

If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.

Owner's Manuals