Although similar in function to the older Chorus XII, it is housed in the new wider/lower metal housing with ‘chicken-head knobs’ for adjustment. Of course, the quality remains the same, and the new housing also encloses the regulated +/-12V power supply for maximum headroom and clarity.

So why design a special chorus just for bass? Most chorus effects in the marketplace are designed for guitar use and therefore are mid-range heavy. The Bass Chorus has been extensively fine-tuned so that the full effect of the chorus is evident as far down as low B.

Like its’ predecessor, the Bass Chorus is a dual stereo effects pedal with independent sets of speed and depth controls. The ‘On’ button allows you to use or bypass the effect and the ‘Select’ button allows you to choose between your two chorus settings. There is an LED to show the effect is on, and each chorus has its’ own LED indicator which flashes at the speed setting. An added feature with the Bass Chorus is found when switching from a slow chorus to a faster chorus, the effect speeds up slowly for that ‘phat’ vintage Leslie effect!

The Bass Chorus is the only choice for bass artists when you compare features….. Carl Martin quality, simplicity, flexibility and transparency.


Inspired from the way the speed changes gradually when going from slow to fast speed on a original Lesley unit, does the Carl Martin BassChorus likewise, this feature is very useful when playing powerful chord harmonics e.i. using a bass overdrive to create Hammond B3-like organ tones.


Power Requirements

Unit’s built after January 2016 comes with the innovative Carl Martin DC/DC circuitry that delivers internally +-12V regulated.
Power consumption: max. 130 mA
Power supply: 9 V DC (regulated), 200 mA minimum, 2.1 mm female plug, center negative (-)

PLEASE NOTICE: It’s not possible to use battery, only external power supply (not included)
ATTENTION: Please Use DC Power Supply Only! Failure to do so may damage the unit and void the warranty.

Unit’s built before January 2016 comes with a built in mains power supply either in 100 or 115 or 230 VAC 50/60 Hz, that deliver internally +-12V regulated Power consumption: 2,4Watts.

PLEASE NOTICE: If purchased in USA (115V) it cannot be used in country’s where 230V is used, you will burn the built in transformer.


Input1M Ohm
Output200 Ohm
S/N Ratio67dB
THD Distortion0,1%
Dimensions186 (W) x 120 (D) x 55 (H) mm
7.31” (W) x 4.72” (D) x 2.16” (H)
Weight820g / 1,81lbs

Warranty: Carl Martin Research warrants the manufacturing, material and proper operation for a period of one year from date of purchase. Carl Martin will replace defective parts, make necessary repairs or replace the unit at the discression of our technicians. The warranty applies only to the original purchaser of this product, and excludes any damage or faulty operation resulting from misuse, neglect or unauthorized service.

HandMade in Denmark
East Sound Research Raadmandsvej 24 8500 Grenaa Denmark Phone: +4586325100

Note: This User's Manual is adapted from the official manual created by Carl Martin in PDF format, without modification of the content. We just rewrite the PDF, into responsive mobile friendly pages.So, you can read this document anytime and anywhere.

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