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.

ΣS212a/85 - 12" Two Way Full Range Active Speaker
ΣS212a/85 - 12" Two Way Full Range Active Speaker


12" Two Way Full Range Active 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 12” high power low frequency transducer
  • 1 x 3” titanium diaphragm compression driver
  • Built-in power amplifier module
  • Master volume control
  • XLR input and output connectors
  • 120Hz low cut switch
  • 80º x 50º controlled coverage pattern
  • 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
  • 2 x XLR connectors


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 12" LF
Input/Output section
Input signal:
Balanced 20kΩ, Unbalanced 10kΩ
Power section
Total Power:
100W HF, 300W LF(RMS);
Nominal Impedance (Ohm):
Voltage range:
AC 220V-240V~, 50/60Hz (or AC 110V-120V~, 50/60Hz)
Physical specifications
Dimension (W x D x H):
377 x 395 x 610mm / (14.8 x 15.6 x 24in)
Package Dimensions (W x D x H):
505 x 485 x 730mm / (19.9 x 19.1 x 28.7in)
Net Weight:
30 kg / 66.1 lb
Gross Weight:
35 kg / 77.2 lb

ΣS212a/85 Application

    ΣS212a/85 Installation

      ΣS212a/85 Parts

        ΣS212a/85 Cases

          ΣS212a/85 Collocation



              ΣS212a/85β3 ΣS212a/85 Datasheet 1.0ΣS212a/85  200KB 2022-07-05 22:02:05
              β3_ΣS212a-85PA_Chinese_Manualβ3_ΣS212a-85PA_Chinese_Manual 1β3_ΣS212a-85PA_Chinese_Manual  3129.21KB 2018-07-12 02:25:39
              β3_ΣS212a-85PA_English_Manualβ3_ΣS212a-85PA_English_Manual 1β3_ΣS212a-85PA_English_Manual  2884.21KB 2018-07-12 02:25:39