MIPRO ACT-311 Headset MU-23D 1

MIPRO ACT-311 Headset MU-23D

The innovative ACT 3 Series wireless microphone systems are a culmination of years of extensive design and manufacturing experience. No wiring and adjustment required as PCB, LCD and front panel are integrated. Featuring 1/2U receivers of single-channel ACT311 & dual-channel ACT-312 and 1U receivers of single-channel ACT300.

EIA standard 19” rack-mountable metal chassis is used instead of cheap plastics. Featuring backlit LCD instead LED display for ease of use and professional appearance.  PLL-synthesized technology for RF stability and matched with rugged ACT-30H & ACT-30T transmitters.

Design and made in Taiwan. Advanced features and functions make it ideal for professional applications with affordable prices.




  • EIA standard 1/2U metal receiver.
  • Receiver provides bias for booster where MIPRO antenna systems can be added for extended receiving range and stability.
  • Backlit LCD displays group, channel, frequency, RF level, antenna selection, AF level, battery level indicator, interference warning indicator, and panel lock indicator.
  • A lit green light indicates a working mode when receiver detects an incoming signal or buttons touched. Light dims automatically when receiver is idle for about 10 seconds.
  • Balanced XLR / unbalanced 1/4 ” audio output jack, output level switch and DC input are on the rear panel. One mixed-output switch is available for dual-channel receivers.
  • High efficiency and low spurious PLL circuitry with Auto Scan functioin. Each receiver is presets with 11 groups, Groups 1~6, 7~10 have 8 &16 compatible channels respectively. Up to 8 channels in group 11 can be saved and recalled within 961 user-defined frequencies. A total of 112 preset channels per band.
  • World’s first ACT™ function provides precise and rapid frequency sync to the transmitters.
  • Advanced diversity technology for optimum reception range and reduces signal dropouts and the “PiloTone & NoiseLock” dual-squelch circuits prevent noise interference.
  • Adjustable ‘SQ’ for higher sensitivity to increase receiving distance and lower sensitivity to reduce interference.
  • Industry’s only RF interference warning indicator for ideal SQ level adjustment.
  • DC input socket accepts 12~15V power supply.
  • Matching ACT-30H handheld and ACT-30T bodypack transmitters.


  • Miniature, compact design.
  • Top features mute switch, mini-XLR connector and antenna.
  • Backlit LCD displays various parameters and indicators.
  • Unique battery cover design provides easy access to operational controls and protects against accidental change of settings.
  • Connector for optional MJ-70 remote mute switch cable.
  • Low spurious PLL-synthesized technology enhances frequency stability and reliability.  One-touch ACT syncs the transmitter and receiver frequency automatically.
  • Selectable impedance for microphone or guitar/line inputs.
  • 4-pin mini XLR connector is compatible with all MIPRO lavalier, headworn microphones and instrument cable.
  • Highly efficient power consumption circuitry ensures long operating hours from 2 AA batteries.
  • Adjustable belt clip allows wearing transmitter in up or down position.


  • Compact ear-hook design for a secure, ultra comfortable fit.
  • Supplied in three ear-hook sizes for ideal fit.
  • Detachable boom can be worn on left or right & detached for replacement or servicing.
  • MU-23 features a 3mm omni-directional capsule.
  • Resistant to moisture, perspiration and salts.
  • Detachable or fixed microphone boom options.
  • Soft yet flexible thin boom bends 120° and holder can be rotated for an ideal fit.
  • Ideal for speech and vocal applications.

Specification :


  • Channel: Single
  • Chassis: EIA-Standard 19″ 1/2U
  • Receiving Mode: Diversity
  • Frequency Range: UHF 480~934MHz
  • Antenna: Rear Panel. Detachable.
  • Preset Channels: 112 preset channels.
  • Group 1-6: 8 compatible channels in each group.
  • Group 7-10: 16 compatible channels in each group.
  • Group 11: Up to 8 channels can be saved & recalled. 961 user-defined frequencies in group 11.
  • Oscillation Mode: PLL Synthesized, Frequency Stability≦±0.005% (-10~+60℃)
  • Sensitivity: 10dBμV, at S/N>80dB
  • S/N Ratio: >106dB(A)
  • T.H.D.: <0.5% @ 1kHz
  • Frequency Response: 50Hz~18kHz, with high pass filter.
  • Squelch: “PiloTone & NoiseLock” dual-squelch circuit.
  • Audio Output Adjustment: Output level accurately pre-adjusted to equal to the microphone capsule sensitivity.
  • Maximum Output Level: 2-level Switch: Line & Mic
  • Power Supply: External AC Adapter, 12~15V DC, 1A
  • Dimensions: 210(W)×44(H)×180(D)mm / 8.3(W)x1.7(H)x7.1(D)”
  • Weight: Approx. 0.8kg / 1.8lbs
  • Note: Refer to actual product in the event of product discrepancy.
  • Frequency range and maximum deviation comply with the regulations of different countries.


  • Housing: Rugged Plastic
  • Frequency Range: UHF 480~934MHz
  • Bandwidth: 24MHz
  • Oscillation Mode: PLL Synthesized
  • Channel Set-Up: ACT Sync
  • LCD Display: LCD displays working band-code, group, channel, frequency, AF input gain, RF output power, mute & lock status, battery status and error codes.
  • RF Output Power: 10mW / 50mW (switchable)
  • Spurious Emissions: <-55dBc
  • Max. Input Level: 0dBV
  • Mute Connector: Optional MJ-70 remote mute switch
  • Battery: 2 AA alkaline
  • Dimensions: 63(W)×82(H)x22(D)mm / 2.5(W)x3.2(H)x0.9(D)”
  • Weight: Approx. 81g / 2.9oz (excluding batteries)
  • Patents & Approvals: Patented. Telecom and safety regulations approved.
  • Note: Refer to actual product in the event of product discrepancy.
  • Frequency range and maximum deviation comply with the regulations of different countries.

MU-23D Dual-sided head worn microphone

  • Capsule Module: 3 mm Ø omni-directional condenser microphone
  • Frequency Response: 40Hz~20kHz
  • Sensitivity: -56±3dBV/Pa(0dB=1V/Pa)
  • Max. SPL: 138 dB (1%THD typical)
  • Microphone Holder Can be installed on right or left side.
  • Plug: 4-pin mini XLR (screw-lock)
  • Color: Beige
  • Cable Length: 150 cm / 59.1 “
  • Weight: Approx. 22 g / 0.8 oz
  • Note: Refer to actual product in the event of product description discrepancy.


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