ΣS Series Wood Speaker

ΣS Series Wood Speaker

The Beta Three® ΣS series is a series of compact professional speakers perfectly suited for various portable and installed applications. It is incredibly lightweight and compact, easy to set up and operate, and complemented by its distinct feature of being used as a PA system or a stage monitor. The ΣS series is specially designed for applications including Houses of Worship, banquet halls, nightclubs, ballrooms, and many other venues demanding extraordinary acoustic performance.

ΣB118D - 18" Bandpass LF Speaker
ΣB118D - 18" Bandpass LF Speaker
ΣB118D - 18" Bandpass LF Speaker


18" Bandpass LF Speaker

The Beta Three® ΣB Series Sub speakers utilise high power low frequency drivers with structurally solid enclosures with bandpass configurations. The ΣB Series Sub speakers deliver extended low frequency bandwidth with excellent punch. Suitable for Performing Arts, Auditoriums, Clubs, Houses of Worship, Entertainment Venues and Indoor Sports Facilities. 


  • High sensitivity and SPL
  • 1 x 18” high power low frequency transducer
  • Six order bandpass configuration
  • Speakon input connectors
  • Computer aided design to optimise frequency and phase response
  • Stacking locators
  • 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 cabinets
  • Durable Polyurethane textured base paint


Acoustical specifications
Frequency Response(-3db):
Max SPL @ 1m:
1 x 18" LF
Input/Output section
Input Connectors:
2 x NL4
Sensitivity (1W @ 1m):
Power section
Total Power:
500W(RMS); 1000W(MUSIC); 2000W(PEAK);
Nominal Impedance (Ohm):
Physical specifications
Dimension (W x D x H):
693 x 580 x 539mm / (27.3 x 22.8 x 21.2in)
Package Dimensions (W x D x H):
803 x 690 x 650mm / (31.6 x 27.2 x 25.6in)
Net Weight:
37 kg / 81.6 lb
Gross Weight:
44.4 kg / 97.9 lb

ΣB118D Application

    ΣB118D Installation

      ΣB118D Parts

        ΣB118D Collocation



            ΣB118Dβ3 ΣB118D Datasheet 1.0ΣB118D  200KB 2022-07-05 03:08:22
            β3_ΣB118D_PA_English_Manualβ3_ΣB118D_PA_English_Manual 1β3_ΣB118D_PA_English_Manual  1404KB 2022-05-09 16:33:52