Magnat Betasub 20 A

Active bass-reflex subwoofer with 200 mm woofer driver

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  • Black/Ash Decor
  • Silver

Data sheet

Unit of MeasurementUnit

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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.



Technical Data



Powered bassreflex subwoofer, down-fire


200 mm woofer

Output power (RMS / Max.)70 / 140 watts
Frequency Response25 – 200 Hz
Crossover Frequencies50 - 200 Hz adjustable

switchable 0°/180°

Dimensions (WxHxD)

260 x 430 x 400 mm

Cabinet surface

Black Satin/Ash Decor Black







  • 200 mm woofer



  • Down-fire construction
  • Flow-optimised “Airflex” reflex tube
  • Rubber spikes included



  • Active bass-reflex subwoofer, down-fire


Woofer / midrange

  • high-power long-throw woofer


Amplifier and power supply

  • Automatic standby circuit
  • LPC circuit
  • Phase switchable from 0° to 180°
  • Real-time limiter
  • Mains switch
  • Selectable mains voltage (115/230 V)
  • Adjustable volume and crossover frequency



  • High level input
  • Low-level input