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Betasub 20 A

Active bass-reflex subwoofer with 200 mm woofer driver

  • Deep bass specialist in downfire design: precise and powerful bass even for demanding home cinema scenes
  • Perfectly complements any home cinema system
  • 200 mm long excursion woofer and Airflex bass reflex port for maximum bass performance
  • 70 watts RMS output for a strong bass foundation and 140 watts of pulse power for dynamic scenes
  • Sturdy enclosure including rubber spikes for secure and stable set-up

Active bass reflex subwoofer with 200 mm bass range driver

This, the smallest but still powerful Betasub model, is powered by a 140 watt high-performance power amplifier and covers a low-bass bandwidth that ranges from 200 to 25 Hz – which is infinitely adjustable between 200 and 50 Hz.

The downfire case design enables the subwoofer to deliver a bass that in relation to its external dimensions is very deep and powerful. The reason: the cone surface area has been fitted at a very small and precisely defined distance from the floor in the solid and low-resonance case. The driver is supported by the Airflex bass-reflex port that has been secured to the front of this bass powerhouse with five screws. The Betasub 20A is the ideal bass partner for a loudspeaker from Magnat´s Vector 200 series.

Downfire design for crisp, deep bass

The downfire enclosure design helps the Beta Sub 20 A to produce a very deep and strong bass foundation. The driver is supported by an Airflex bass reflex port at the front. The bass reflex output, secured by five screws, ensures untroubled and interference-free enjoyment, even in critical sequences.

The terminal

This subwoofer is driven by a 140 watt high-performance power amp – serving a deep bass range of 200 to 25 Hz – and is infinitely adjustable between 200 and 50 Hz.

Defined clearance below

With a very small and precisely defined clearance between the bottom of the unit and the underlying surface, the subwoofer membrane surface can be particularly well controlled and pushed to the limit acoustically.

Technical specifi cations

  • Powered bassreflex subwoofer, down-fire
  • 200 mm woofer
Output power (RMS/Max.)
  • 70 / 140 watts
Frequency Response
  • 25 – 200 Hz
Crossover Frequencies
  • 50 - 200 Hz adjustable
  • switchable 0°/180°
Dimensions (WxHxD)
  • 260 x 430 x 400 mm
Cabinet surface
  • Black Satin/Ash Decor Black
  • Silver


Woofer / midrange
  • High-power long-throw woofer
Amplifier and power supply
  • Automatic standby circuit
  • LPC-feature
  • Phase switchable 0° - 180°
  • Real-time Limiter (rt-limiter)
  • Surge protection with LED indicator light
  • Switchable mains voltage 115/230 V
  • Volume and crossover frequency adjustable
  • High Level input
  • low level inputs
  • ‚Downfire’ construction
  • Aerodynamic optimized “Airflex” ports
  • Rubber spikes included
Cabinet surface
  • Black Satin/Ash Decor Black
  • Silver