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.

ΣS215/85 - 15" Two Way Full Range Speaker
ΣS215/85 - 15" Two Way Full Range Speaker
ΣS215/85 - 15" Two Way Full Range Speaker
ΣS215/85 - 15" Two Way Full Range Speaker


15" Two Way Full Range Speaker

Portable and Installed PA loudspeakers used in applications including sound reinforcement and stage monitoring in Houses of Worship, Events, Clubs,Rehearsal Halls, Ballrooms. Σ Series delivers extraordinary performance at unmatched value. 


  • High SPL and sensitivity
  • 1 x 15” high power low frequency transducer
  • 1 x 3” titanium diaphragm compression driver
  • Passive configuration
  • 80º x 50º controlled coverage pattern
  • 2 x NL4 connectors
  • Computer aided design to optimise frequency and phase response
  • Multi purpose cabinet design for FOH or monitor use
  • Suitable for use as a main system with or without sub speaker augmentation
  • Integral 35mm pole mount receptacle for stand or vertical installation
  • Mounting points for permanent installation (wall, ceiling, under balcony)
  • Combine with any ΣB or ΣJ Series high power sub speaker for extended low frequency, high quality music reproduction
  • Powder coated grill
  • Durable Polyurethane textured base paint
  • 1 x NL4 connector included in packaging


Acoustical specifications
Frequency Response(-3db):
Max SPL @ 1m:
Dispersion (H x V):
80° x 50°
Compression driver:
1 x 3" HF Compression Driver
1 x 15" LF
Input/Output section
Input Connectors:
2 x NL4
Sensitivity (1W @ 1m):
Processor section
Crossover frequencies:
Power section
Total Power:
Nominal Impedance (Ohm):
Physical specifications
Dimension (W x D x H):
462 x 440 x 720mm / (18.2 x 17.3 x 28.3in)
Package Dimensions (W x D x H):
570 x 550 x 840mm / (22.4 x 21.7 x 33.1in)
Net Weight:
33 kg / 72.8 lb
Gross Weight:
37 kg / 81.6 lb

ΣS215/85 Application

    ΣS215/85 Installation

      ΣS215/85 Parts

        ΣS215/85 Collocation



            ΣS215/85β3 ΣS215/85 Datasheet 1.0ΣS215/85  200KB 2022-07-06 01:37:26
            β3_ΣS215-85_PA_Chinese_Manualβ3_ΣS215-85_PA_Chinese_Manual 1β3_ΣS215-85_PA_Chinese_Manual  3713.86KB 2018-07-12 02:25:39
            β3_ΣS215-85_PA_English_Manualβ3_ΣS215-85_PA_English_Manual 1β3_ΣS215-85_PA_English_Manual  3582.09KB 2018-07-12 02:25:39