Boss CE-20 Chorus Ensemble Dimensional Processor User Manual

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Boss CE-20 Chorus Ensemble Dimensional Processor Manual

The boss CE-20 Chorus Ensemble Dimensional Processor is a versatile digital chorus unit designed to produce wide, animated, and spacious modulation for electric guitar, bass, keyboards, acoustic instruments, and other line-level sources. Unlike a conventional compact chorus pedal, the CE-20 combines multiple chorus characters, stereo operation, programmable memories, and expanded sound-shaping controls in a floor-based processor.

Six chorus modes are available: Rich, Bass, Acoustic, Standard, CE-1, and Dimensional D. These modes cover subtle tone enhancement, classic ensemble movement, deep stereo width, and pronounced vintage modulation. The Brilliance control adjusts the apparent sparkle of the effect, while Ambience adds reverb-like spaciousness to the processed sound.

The CE-20 is suitable for live performers, recording musicians, keyboard players, studio engineers, and guitarists who need repeatable presets rather than a single fixed effect. Four user memories store complete knob settings, and a Manual mode provides direct access to the current panel controls. Stereo inputs and outputs support broad amplifier, mixer, and recording-system setups, while a dedicated headphone output is useful for quiet monitoring.

As a discontinued BOSS product, the CE-20 is best used with its owner’s manual and carefully maintained connections. Its combination of chorus modes, ambience, memory storage, and stereo connectivity makes it a practical choice for creating spacious modulation sounds in both stage and studio environments.

Boss CE-20 Specifications and Key Features

Effect type: Digital chorus and ensemble processor with six selectable modes.
Chorus modes: Rich, Bass, Acoustic, Standard, CE-1, and Dimensional D.
Additional controls: Brilliance for tonal sparkle and Ambience for added spaciousness.
Memory system: Manual mode plus four user memories for storing complete control settings.
Connections: Stereo input and output configuration with a dedicated headphone output.
Nominal input level: -20 dBu for guitar or bass and +4 dBu for amplifier send/return connections.
Nominal output level: -20 dBu for guitar or bass and +4 dBu for amplifier send/return connections.
Input impedance: 1 MΩ.
Output impedance: 1 kΩ for the main outputs and 33 Ω for the headphone output.
Recommended load impedance: 10 kΩ or higher for the main output.
Residual noise: -93 dBu or less, typical IHF-A measurement.
Power: 9 V DC from six AA batteries or a compatible PSA-series AC adapter.
Current draw: 160 mA maximum at 9 V.
Dimensions: 173 × 158 × 57 mm, including the standard enclosure dimensions.
Weight: Approximately 1.1 kg with batteries installed.

How to Set Up the Boss CE-20 Chorus Ensemble Dimensional Processor

Place the CE-20 on a stable, dry surface with sufficient ventilation around the enclosure.
Install six AA batteries if portable operation is required, or connect a compatible 9 V PSA-series AC adapter. Confirm the adapter polarity and voltage before switching on the unit.
For a standard guitar or bass setup, connect the instrument to the input and connect the main output to an amplifier, mixer, or recording interface.
For stereo operation, connect both left and right outputs to separate amplifier channels, mixer inputs, or interface inputs. Use the right output alone when a mono connection is required.
For an amplifier effects loop, connect the amplifier send to the CE-20 input and the CE-20 outputs to the amplifier return. Use the higher-level send/return setting only with suitable equipment.
Turn down amplifier and mixer levels, power the system, select Manual mode, and gradually raise the volume.
Select a chorus mode, then adjust Rate, Depth, Effect Level, Brilliance, and Ambience to taste. Store useful settings in one of the four user memories.
Connect headphones only to the dedicated headphone output. Do not connect headphones to the main outputs.

If the sound is distorted, reduce the source or send level and confirm that the CE-20 is connected to the appropriate instrument or effects-loop signal path. Avoid exposing the processor to moisture, excessive heat, strong vibration, or unsuitable power supplies.

Boss CE-20 Troubleshooting Guide

No sound or intermittent audio

Confirm that the input cable is connected to the correct jack and that the output cable reaches the amplifier, mixer, or interface. Test each cable separately, verify the amplifier channel is active, and check the volume controls. With a stereo setup, test the left and right outputs independently to identify a cable or channel problem.

Distorted or excessively loud signal

Check whether the CE-20 is connected to a guitar-level input or an amplifier send/return loop. A mismatch between instrument-level and line-level equipment can cause clipping or an unusually weak signal. Lower the source level and confirm that connected equipment accepts the selected signal level.

Effect sounds too weak or too intense

Select a different chorus mode and reduce Depth or Effect Level for a subtler result. Raise Brilliance for additional definition, or reduce Ambience if the sound becomes too diffuse. In Manual mode, confirm that the physical controls match the desired setting rather than a stored memory.

Memories do not recall the expected sound

Save the complete configuration to the intended user memory after adjusting the controls. Recall the memory again and verify that the correct memory location is selected. Avoid changing controls immediately after recalling a preset unless a new setting is intended.

Power problems

Replace all six batteries together with the same type, observing the polarity markings. For adapter operation, use a compatible 9 V PSA-series unit and inspect the connector for damage. Remove batteries during extended storage to reduce the risk of leakage.

The CE-20 has no commonly published user-facing error-code system; symptoms are generally addressed through connection, level, memory, and power checks. For manuals, service documentation, or repair guidance, use the BOSS product-support section and an authorized Roland/BOSS service provider. Warranty coverage depends on the original purchase conditions, region, and whether the unit is still eligible for service.

Boss CE-20 Pros and Cons

Advantages

Broad sound selection: Six chorus modes cover guitar, bass, acoustic instruments, classic CE-1-style character, and spacious dimensional effects.
Detailed tone shaping: Brilliance and Ambience provide more control than the basic Rate, Depth, and Level arrangement typical of many chorus pedals.
Preset convenience: Four user memories make it practical to prepare separate sounds for verses, choruses, songs, or instruments.
Stereo flexibility: Stereo inputs and outputs suit dual amplifiers, mixers, keyboards, and recording interfaces.
Quiet monitoring: The dedicated headphone output supports setup and practice without relying on an amplifier.
Useful for multiple instruments: Dedicated modes and selectable signal-level applications make it more adaptable than a simple guitar-only chorus.

Limitations

Larger format: The enclosure occupies more pedalboard space than a typical compact chorus pedal.
Higher power demand: Its 160 mA maximum current draw and six-battery requirement make adapter operation preferable for regular use.
More complex operation: Users seeking a single-knob chorus may find the mode and memory system unnecessary.
Discontinued status: Replacement parts, official service availability, and documentation access may vary by region.
Best suited to: Performers and studios that need stereo width, stored presets, multiple chorus styles, and detailed control.
Consider another product if: Minimal pedalboard size, modern compact integration, or an extremely simple chorus control layout is the priority.

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Faqs

How do I set up the boss CE-20 Chorus Ensemble Dimensional Processor for the first time?

Connect your guitar, bass, or compatible line-level source to the INPUT jack, then connect OUTPUT R (MONO) to your amplifier or recording device. Use OUTPUT L as well for stereo operation. Install six AA batteries or connect a suitable 9V DC adapter, then switch the effect on. Start with moderate Rate, Depth, and Effect Level settings, select a chorus mode, and adjust the Direct Level to blend the dry signal with the processed sound.

Which chorus mode should I choose on the boss CE-20 Chorus Ensemble Dimensional Processor?

The CE-20 includes Rich, Bass, Acoustic, Standard, CE-1, and Dimensional D modes. Use Bass for a focused low-end response, Acoustic for enhancing acoustic instruments, and Standard for a familiar chorus sound. CE-1 provides a vintage-style character, while Dimensional D creates a wide, subtle spatial effect. Rich is useful when you want a more pronounced, full stereo chorus sound.

How can I connect the boss CE-20 Chorus Ensemble Dimensional Processor to an amplifier effects loop?

Connect the amplifier’s effects-loop send to the CE-20 input and the CE-20 output to the amplifier’s return. Use the SEND/RETURN level setting or connection approach recommended for your amplifier so the signal does not overload the processor. The CE-20 supports higher-level effects-loop signals than a typical instrument input, but begin with conservative amplifier and CE-20 output settings to prevent clipping.

Why is the boss CE-20 Chorus Ensemble Dimensional Processor producing no sound?

Check that the input and output cables are connected to the correct jacks and that OUTPUT R (MONO) is used when connecting to one amplifier. Confirm the effect is switched on, the amplifier is receiving signal, and the CE-20’s Effect Level and Direct Level are not both turned fully down. If using batteries, replace all six AA cells or test the unit with a compatible 9V adapter.

How do I save and recall sounds on the boss CE-20 Chorus Ensemble Dimensional Processor?

The CE-20 provides four user memories plus a Manual mode. Create your sound by selecting a chorus mode and adjusting the controls, then store it in an available memory according to the panel’s memory operation. Use the Memory function to recall saved settings during performance. Manual mode uses the current knob positions, while memory mode recalls stored control values rather than simply copying the visible knob positions.

Can I use headphones with the boss CE-20 Chorus Ensemble Dimensional Processor?

Yes, the CE-20 has a dedicated headphone output, making it useful for quiet practice and checking stereo chorus effects. Connect headphones to the PHONES jack and begin with the level low to protect your hearing. For normal amplifier use, connect the OUTPUT R (MONO) jack. When using stereo equipment, connect both left and right outputs and verify that the receiving device accepts the signal level.

How can I reduce noise or unwanted volume changes with the boss CE-20 Chorus Ensemble Dimensional Processor?

Use short, shielded cables and keep audio cables away from power adapters and transformers. Confirm that the CE-20 input and output levels match the connected equipment; an effects-loop connection may require different level handling than a guitar input. Reduce excessive Effect Level or Depth if the sound becomes unstable, and test the processor with a fresh power source. Persistent hum may indicate a grounding or cable problem elsewhere in the rig.

How should I maintain and store the boss CE-20 Chorus Ensemble Dimensional Processor?

Wipe the CE-20 with a soft, dry cloth and keep liquid, dust, heat, and excessive humidity away from its controls and connectors. Disconnect the adapter when the unit will not be used for an extended period. Remove the six AA batteries during long-term storage to help prevent leakage. Transport the processor in a padded case, and avoid forcing footswitches, plugs, or control knobs.