Brand: JIM DUNLOP
MODEL: M87
Jim Dunlop MXR Bass Compressor Pedal
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The Bass Compressor provides recording-quality compression with Constant Headroom Technology and true bypass switching for keeping your low end tight and clean.
This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick, Iso-Brick, and Mini Iso-Brick power supplies (not included).
Directions:
- Run a cable from your bass to the Bass Compressor’s INPUT jack and run another cable from the Bass Compressor’s OUTPUT jack to your amplifier.
- Set RELEASE, ATTACK, OUTPUT and INPUT controls to 12 o’clock and the RATIO control to 4.
- Turn the effect on by depressing the footswitch.
- Observe the METER display while playing normally and set the INPUT knob so that the first 3 to 7 green gain reduction LEDs light, clockwise to light more and counterclockwise to light less LEDs.
- Rotate the OUTPUT knob clockwise to increase overall effect volume or counterclockwise to decrease it.
- Rotate the ATTACK knob clockwise to increase reaction time of compression or counterclockwise to decrease it.
- Rotate the RELEASE knob clockwise to increase the time it takes your signal to return to its uncompressed level or counterclockwise to decrease it.
- Use the RATIO knob to select compression ratio. The 4 setting selects a 4:1 ratio, meaning that if the input level rises 4 decibelsabove threshold, the output level will only rise by 1 decibel. Therefore, gain has been reduced by 3 decibels. The 8 setting selects an 8:1 compression ratio, 12 selects 12:1, and 20 selects 20:1.
Input Impedance 1 MΩ
Output Impedance 600 Ω
Max Input Level +14 dBV
Max Output Level +8.5 dBV
Freq. Response
±1 dB, 20 Hz to 20 kHz
Noise Floor* -90 dBV
THD** >0.5%
Gain 31 dB
Compression Ratio
4:1, 8:1, 12:1, 20:1
Attack Time 20 µs to 800 µs
Release Time 50 ms to 1.1 s
Bypass True Hardwire
Current Draw
LEDs OFF 14 mA
LEDs ON 19 mA
Power Supply 9 volts DC
The Bass Compressor provides recording-quality compression with Constant Headroom Technology and true bypass switching for keeping your low end tight and clean.
This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick, Iso-Brick, and Mini Iso-Brick power supplies (not included).
Directions:
- Run a cable from your bass to the Bass Compressor’s INPUT jack and run another cable from the Bass Compressor’s OUTPUT jack to your amplifier.
- Set RELEASE, ATTACK, OUTPUT and INPUT controls to 12 o’clock and the RATIO control to 4.
- Turn the effect on by depressing the footswitch.
- Observe the METER display while playing normally and set the INPUT knob so that the first 3 to 7 green gain reduction LEDs light, clockwise to light more and counterclockwise to light less LEDs.
- Rotate the OUTPUT knob clockwise to increase overall effect volume or counterclockwise to decrease it.
- Rotate the ATTACK knob clockwise to increase reaction time of compression or counterclockwise to decrease it.
- Rotate the RELEASE knob clockwise to increase the time it takes your signal to return to its uncompressed level or counterclockwise to decrease it.
- Use the RATIO knob to select compression ratio. The 4 setting selects a 4:1 ratio, meaning that if the input level rises 4 decibelsabove threshold, the output level will only rise by 1 decibel. Therefore, gain has been reduced by 3 decibels. The 8 setting selects an 8:1 compression ratio, 12 selects 12:1, and 20 selects 20:1.
Input Impedance 1 MΩ
Output Impedance 600 Ω
Max Input Level +14 dBV
Max Output Level +8.5 dBV
Freq. Response
±1 dB, 20 Hz to 20 kHz
Noise Floor* -90 dBV
THD** >0.5%
Gain 31 dB
Compression Ratio
4:1, 8:1, 12:1, 20:1
Attack Time 20 µs to 800 µs
Release Time 50 ms to 1.1 s
Bypass True Hardwire
Current Draw
LEDs OFF 14 mA
LEDs ON 19 mA
Power Supply 9 volts DC