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Dunlop produced the MXR Dyna Comp Mini (M291-U) as a compact variant of the original Dyna Comp compressor, housed in a enclosure described as nearly half the size of its predecessor. The unit occupied the same functional territory as the classic Dyna Comp while adding a discrete Attack switch not present on the original, allowing the player to select between slow and fast attack times.
The M291-U operates on a 9 V DC supply drawing 4 mA. It presents an input impedance of 800 kΩ and an output impedance of 15 kΩ, with a maximum input level of −5 dBV and a maximum output level of −12 dBV. Maximum compression reaches 36 dB, total harmonic distortion is rated at 0.2 %, and the noise floor sits at −95 dBV. The Attack switch — the distinguishing addition over the standard Dyna Comp — toggles between the two attack modes at the unit level, requiring no external routing.
Owners needing calibration, switch service, or power-supply troubleshooting should consult a qualified electronics technician familiar with compact effects units.
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