Active subwoofer bass reflex, downfire, 180/360W / Piano White / WHITE
  • Recommended retail price: 930.00 / piece
  • Brand website: Magnat


Active subwoofer, bass reflex, downfire

The Quantum 731A is the perfect low-bass counterpart to the Quantum 750 series. Besides the extremely low-resonance 45 mm case front on a corpus with multiple stiffening, it offers a clear and modern language of shape that is available in perfect high-gloss or silk-matt varnish finishes. The latest-generation computer-optimised long-throw subwoofer chassis delivers uncompromisingly clean and dynamic basses.

The Quantum 731A is available in a black, white or black-mocca finish. A long-throw subwoofer chassis with a diameter of 300 mm and hardened paper cone, high-strength die-cast basket and ventilated high-performance voice coil is responsible for ideal bass precision. The high-gloss base plate maintains a defined distance to the chassis for optimum level efficiency, the high-performance power amplifier guarantees highest level reserves.


  • 300 mm woofer
  • Down-fire construction
  • Airflex port with a large opening area to guarantee best bass coupling
  • Large resonance absorbers
  • Very sturdy and elegant design made from MDF boards with elaborate bracing
  • 35 mm thick base plate in a high-gloss varnish finish
  • 45 mm thick, two-layer front panel in a high-gloss varnish finish
  • Bassreflex, down-fire
  • high-power long-throw woofer
  • Coated and hardened paper cone guarantees deep-reaching reproduction with simultaneous pulse fidelity
  • Ventilated high-performance voice coil to guarantee highest operational reliability
  • Klippel®-optimised magnet system
  • Adjustable volume and crossover frequency
  • Phase switchable from 0° to 180°
  • Active frequency-response equalisation up to 180 Hz for easy integration into AV environments
  • Real-time limiter minimises distortion and prevents the loudspeaker from being overloaded
  • Clearly arranged control panel made ofbrushed aluminium with large heatsink
  • Separate standby power-supply unit for low standby power consumption
  • Mains switch
  • Low stand-by power consumption
  • Low-level stereo inputs
  • High-level stereo inputs
  • LFE input

Technical Details

  • Principle: bass reflex, ‘Down-fire’ construction
  • Equipment: 300 mm Woofer
  • Output power (RMS / Max.): 180 / 360 watts
  • Frequency Response: 18 - 200Hz
  • Crossover Frequencies: 40-180 Hz adjustable
  • Phase: switchable 0°/180°
  • Dimensions (WxHxD): 340 x 568 x 475 mm
  • Weight: 26.1 kg
  • Cabinet surface: Piano White / White satin

Test review (video | 02/2013) (German)

Test review (HDfever | 01/2013) (French)

Test review (audiovision | 01/2013)

Test review (Heimkino | 12-01/2013)