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Dunlop positioned the M134-U MXR Stereo Chorus as an analog chorus pedal within the MXR effects line. It offered stereo output alongside a set of controls designed to shape the character of the chorus effect and retain low-end frequency content.
The unit ran on an 18-volt DC supply, drawing 26 mA, and delivered a frequency response of 20 Hz to 20 kHz at ±1 dB. Maximum delay reached 16 ms, with a rate control spanning 0.1 Hz to 10 Hz. Tone shaping was handled by a bass control offering ±12 dB at 100 Hz and a treble control offering ±12 dB at 3 kHz. Input impedance was 2.2 MΩ and output impedance 3.3 kΩ. The noise floor sat at -100 dBV with a 2:1 noise reduction scheme, total harmonic distortion remained below 0.1%, and the bypass was buffered.
Owners requiring service, recalibration, or sourcing of compatible 18-volt power supplies and replacement components should consult a qualified guitar technician or electronics repair specialist familiar with analog effects circuitry.
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Dunlop
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Since 2007
