S series Plastic Speaker

S series Plastic Speaker

The Beta Three® S series is a series of professional coaxial plastic speakers perfectly suited for various portable and installed applications. The coaxial feature and the neodymium magnets utilized in this series significantly reduces the overall weight of the speakers and makes it extremely compact. The weather-resistant feature of the S series allows this system to optimize performance in both indoor and outdoor applications.

S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker
S400 - 4" Two Way Full Range Speaker


4" Two Way Full Range Speaker

Professional portable and installed plastic loudspeakers where high sound quality is required. Can be used in applications including sound reinforcement in Front of House and Foldback applications in Houses of Worship, Events, Clubs, Rehearsal Halls etc. The S Series is suitable for music and vocal reproduction in demanding applications. 


  • High output SPL and sensitivity
  • 2 x 4” high power transducers
  • 1 x 1” diaphragm compression driver
  • 120º x 120º controlled coverage pattern
  • Injection molded 1 x NL4 connector
  • 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)
  • Powder coated grill with foam backing
  • Comes with convenient mounting bracket
  • Available with 70V/100V line transformer
  • Available in black or white


Acoustical specifications
Frequency Response(-3db):
Max SPL @ 1m:
Dispersion (H x V):
120° x 120°
Compression driver:
1 x 1" HF
2 x 4" LF
Input/Output section
Input Connectors:
1 x NL4
Sensitivity (1W @ 1m):
Processor section
Crossover frequencies:
Power section
Total Power:
80W(RMS); 160W(MUSIC); 320W(PEAK);
Nominal Impedance (Ohm):
Physical specifications
Dimension (W x D x H):
182 x 182 x 320mm / (7.2 x 7.2 x 12.6in)
Package Dimensions (W x D x H):
230 x 230 x 375mm / (9.1 x 9.1 x 14.8in)
Net Weight:
4.5 kg / 9.9 lb
Gross Weight:
5.5 kg / 12.1 lb

S400 Application

    S400 Installation

      S400 Parts

        S400 Cases

          S400 Collocation



              S400β3 S400 Datasheet 1.0S400  200KB 2022-07-06 08:51:22
              β3_S400_Plastic_Speaker_Chinese_Manualβ3_S400_Plastic_Speaker_Chinese_Manual 1β3_S400_Plastic_Speaker_Chinese_Manual  2054.55KB 2018-07-12 02:25:39
              β3_S400_Plastic_Speaker_English_Manualβ3_S400_Plastic_Speaker_English_Manual 1β3_S400_Plastic_Speaker_English_Manual  2043.15KB 2018-07-12 02:25:39