MU Series Wood Speaker

MU Series Wood Speaker

The Beta Three® MU series is a series of professional speakers ideally suited for a wide range of portable and installed applications. It is highly flexible and powerful in providing very high output and dynamics with a smooth frequency response. The MU series is available in various sizes and both active and passive versions. Whether it is for music or vocal reproduction, the MU series perfectly satisfies the needs of our users.

MU18Ba - 18" Active Subwoofer
MU18Ba - 18" Active Subwoofer
MU18Ba - 18" Active Subwoofer


18" Active Subwoofer

Portable and installed PA loudspeakers used in applications including sound reinforcement in Houses of Worship, Events, Clubs, Rehearsal Halls and Ballrooms etc. The MU Active Series delivers extraordinary performance at unmatched value. 


  • High output SPL and sensitivity
  • 1 x 18” high power low frequency transducer with 100mm voice coil
  • Sensitivity 97dB, max SPL 124dB
  • RMS 500W, peak 2000W
  • Built-in power amplifier module
  • Master volume control
  • XLR input and output connectors
  • Built in variable crossover 80Hz-250Hz high cut
  • Phase switch
  • Computer aided design to optimise frequency and phase response
  • Cabinet designed for FOH use
  • Suitable for use with any full range or mid/high speaker cabinets for extended low frequency, high quality music reproduction
  • Integral 35mm pole receptacle for mounting full range or mid/high speaker cabinet
  • Powder coated grill with foam backing
  • Durable Polyurethane textured base paint


Acoustical specifications
Frequency Response(-3db):
Max SPL @ 1m:
1 x 18" Woofer
Input/Output section
Input signal:
Balanced 20kΩ
Input Connectors:
1 x Combo 6.35/XLR Input, 1 x XLR Output
Power section
Total Power:
500W(RMS); 1000W(MUSIC); 2000W(PEAK);
Nominal Impedance (Ohm):
Voltage range:
AC 220V-240V~, 50/60Hz (or AC 110V-120V~, 50/60Hz)
Physical specifications
Cabinet/Case Material:
18mm birch plywood
Fixed supporting base
4 x Wooden handles
Cabinet coated by Polyurethane paint; grille is powder coated
Dimension (W x D x H):
600 x 640 x 550mm / (23.6 x 25.2 x 21.7in)
Package Dimensions (W x D x H):
740 x 700 x 650mm / (29.1 x 27.6 x 25.6in)
Net Weight:
45 kg / 99.2 lb
Gross Weight:
51 kg / 112.4 lb

MU18Ba Application

    MU18Ba Installation

      MU18Ba Parts

        MU18Ba Collocation



            MU18Baβ3 MU18Ba Datasheet 1.0MU18Ba  200KB 2022-07-06 02:38:53
            β3_MU18Ba_PA_Chinese_Manualβ3_MU18Ba_PA_Chinese_Manual 1β3_MU18Ba_PA_Chinese_Manual  1154.55KB 2018-07-12 02:25:39
            β3_MU18Ba_PA_English_Manualβ3_MU18Ba_PA_English_Manual 1β3_MU18Ba_PA_English_Manual  916.81KB 2018-07-12 02:25:39