Gemini’s MM-4000 provides a feature-rich solution for DJs, club owners and sound installation professionals looking to incorporate a premium, cost-effective mixer into a rack setup. This 4-channel 19-inch mixer combines flexible connections and comprehensive features in a 4U rackmountable design, making the MM-4000 a dynamic and powerful addition to any DJ rack, club installation or live sound reinforcement application.

The MM-4000 boasts an extensive input/output section featuring six line inputs and two phono/line convertible RCA jacks. The unit also includes Master, Record and Zone RCA outputs for connecting external equipment like amplifiers and recording devices. For microphones, the MM-4000 provides five inputs (one combo XLR-¼-inch jack and four ¼-inch jacks) and 2-band EQ for controlling the high and low frequencies of your mic signal. A convenient Talkover switch also allows you to quickly decrease the main output so the microphone can be heard over the music.

To enhance your creativity and help you craft a unique sound, the MM-4000 sports an impressive Effects Section with eight tasteful yet powerful DSP effects that include Reverb, Echo, Vocal Cancellation, Auto Wah, Flanger and Auto Pan. The section also offers an Effect Selection rotary, a Wet/Dry rotary and a Cue EFX button that lets you monitor the effect in your headphones before mixing it in. These effects can even be assigned to your microphone signal.

For outstanding control in any setting, the MM-4000 provides a volume fader, rotary gain control and 3-band EQ on each channel. A tight, smooth Rail Glide cross fader also allows you to mix evenly from one source to another, while a cross fader assignment rotary lets you designate which two channels will be controlled. And for even greater convenience, the MM-4000 includes a VU meter for monitoring decibel levels and a cable for connecting your iPod or other portable media player.

Thanks to comprehensive features and rugged design, the MM-4000 delivers all the value and reliability you’d expect from the long-respected Gemini name.

  • 4U 19-inch rackmounted audio FX mixer
  • 4 stereo channels
  • 6 line and 2 phono RCA inputs
  • 1 balanced XLR master microphone input
  • 4 unbalanced ¼-inch mic channel inputs
  • Master, Zone & Record RCA outputs
  • Balanced XLR master output
  • 3-band rotary line EQ control per channel
  • 8-effect DSP module with 16 presets
  • Dry/Wet rotary control
  • Rotary control FX selector
  • Fully removable, user replaceable Rail Glide cross fader
  • Assignable cross fader
  • Rotary gain control per channel
  • Dual mode VU display with bright LEDs
  • Push-button cue section with CUE/PGM fader control
  • Rotary Master, Zone, Balance and Cue volume controls
  • Rotary main mic volume control
  • 2-band main mic EQ
  • Auto or manual talk-over feature
  • 1/4-inch headphone jack located on faceplate
  • iPod cable included in package


Phono: 3 mV, 47 KOhm
Line: 150 mV, 27 KOhm
MIC: 1.5 mV, 1 KOhm Balanced


Max: 20 V Peak-to-Peak
Rec: 225 mV, 5 KOhm


Frequency Response: 20 Hz – 20 KHz +/- 2 dB
Distortion: 0.02%
S/N Ratio: Better Than 85 dB
Headphone Impedance: 16 Ohm
Power Source: 115/230v, 50/60Hz, 20w
Unit Dimensions: 19″ x 3.3″ x 7″
(482.6 x 83.82 x 177.8 mm)
Weight: 10 lbs
(4.53 kg)


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About Gemini

History has always been an important part of the Gemini Culture.

Since 1974, we've provided innovative products for DJs, musicians, sound contractors and professional installers around the globe.