Donner Ultimate Compressor Pedal Filter Effect with Normal and Treble Compression

SKU: EC888

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The Ultimate Comp is a 100% analog compressor pedal, recreating a warm, studio-like optical compression sound that is rare in compressor pedals. Note: Please use a power adapter with a voltage of DC9V, an internal negative and external positive polarity and a current of 500mA or more to power your pedal. Failure to do so can cause serious situations where the product does not work or is damaged.

Inspired By Classics And More

The Ultimate Comp is inspired by expensive studio rack-mount optical compressor/limiter units, recreating the iconic smooth, warm compression sound. 

Easy Controls, Wide Flexibilities

The Ultimate Comp features an easy-to-use three-knob control scheme: COMP(compression intensity), TONE (brightness) and LEVEL (output volume) for dialing in your exact sound. Each knob gives you a wide control range. 

Two Modes

The Ultimate Comp offers a two-way selector for choosing from two sound settings: NORMAL, for a neutral optical compressor sound, and TREBLE, for a brighter optical compressor sound with more bite. 

1. DC 9V Jack: For a power supply, use a 9-volt DC adapter, with at least 500mA (center-negative). 

2. Tone Selector: Switches between two modes: NORMAL: Neutral compression tone. TREBLE: Brighter compression tone. 

3. LEVEL Knob: Controls the output volume.

4. TONE Knob: Controls the effect tone.

5. COMP Knob: Controls the intensity of compression.

6. Input and Output Jacks: 1/4 mono audio jacks, for connecting to your guitar, other effects, or an amplifier

7. Foot Switch : Tap to switch to turn the unit on or off. The LED will light up when the effect is on. 


    • Power Requirement: 9V DC center negative
    • Current Consumption: 10mA
    • Dimensions: 1.7in x 3.7in x 2in (4.2cm x 9.35cm x 5.2cm) 
    • Weight: 8.1oz (230g) 
    Package Includes
    • Donner Ultimate Comp Effect Pedal X 1
    • User's Manual X 1


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