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.

MU15a - 15" Two Way Full Range Active Speaker
MU15a - 15" Two Way Full Range Active Speaker
MU15a - 15" Two Way Full Range Active Speaker


15" Two Way Full Range Active Speaker

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 15” high power transducer with 75mm voice coil
  • 1 x 3” compression driver
  • 90º x 40º coverage pattern
  • Built-in power amplifier module
  • Master volume control
  • XLR input and output connectors
  • 120Hz low cut switch
  • Computer aided design to optimise frequency and phase response
  • Cabinet design for FOH use
  • Suitable for use as a main system with or without sub speaker augmentation
  • Portable system (stand), or permanent installation (wall, ceiling, under balcony)
  • Adjustable flying track on the top and bottom of the speaker
  • Arrays with MU12B, MU12Ba, MU18B and MU18Ba high power sub speakers for xtended low frequency, high quality music reproduction
  • Powder coated grill with foam backing
  • Durable Polyurethane textured base paint


Acoustical specifications
Frequency Response(-3db):
Max SPL @ 1m:
Dispersion (H x V):
60° x 40°
Compression driver:
1 x 3" HF Compression Driver
1 x 15" LF
Input/Output section
Input signal:
Balanced 20kΩ, Unbalanced 10kΩ
Input Connectors:
6.35/XLR for input, XLR for output
Power section
Total Power:
460W(RMS); 920W(MUSIC); 1840W(PEAK);
Nominal Impedance (Ohm):
Voltage range:
AC 220V-240V~, 50/60Hz (or AC 110V-120V~, 50/60Hz)
Standard compliance
CE marking:
Physical specifications
Cabinet/Case Material:
15mm Birch Plywood
Standard flying hardware
2 x Wooden handles
Cabinet coated by Polyurethane paint; grille is powder coated
Dimension (W x D x H):
485 x 485 x 720mm / (19.1 x 19.1 x 28.3in)
Package Dimensions (W x D x H):
595 x 595 x 840mm / (23.4 x 23.4 x 33.1in)
Net Weight:
32.5 kg / 71.7 lb
Gross Weight:
37.5 kg / 82.7 lb

MU15a Application

    MU15a Installation

      MU15a Parts

        MU15a Cases

          MU15a Collocation



              MU15aβ3 MU15a Datasheet 1.0MU15a  200KB 2022-07-06 09:29:32
              β3_MU15a_PA_Chinese_Manualβ3_MU15a_PA_Chinese_Manual 1β3_MU15a_PA_Chinese_Manual  1271.74KB 2018-07-12 02:25:39
              β3_MU15a_PA_English_Manualβ3_MU15a_PA_English_Manual 1β3_MU15a_PA_English_Manual  1015.88KB 2018-07-12 02:25:39