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dB Technologies DVA S1521N


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Product Overview

Active Subwoofer 21 Bassreflex

The DVA S1521N is a powered 21“ subwoofer housed in a bass reflex enclosure that we tuned for accurate, ultra low-frequency response. It readily integrates into large DVA and DVX Series PA systems as a sub-bass unit or as a stacked subwoofer. Made of durable birch multiplex covered in robust black textured lacquer, the high-quality housing provides six carrying handles, an M20 pole mount, and bushings on the rear panel that accept casters. Pick-points for attaching DRK-10 and DRK-20 harnesses are built into the top panel to enable easy, safe stacking.

Top-notch 21“ woofer
Serving as the unit’s transducer is a state-of-the-art 21” woofer with neodymium magnets and a 4.5“ voice coil. This combination of high-quality materials and sophisticated magnetic drivers yields some pretty impressive results. Even very low bass frequencies are rendered with pinpoint precision and hair-trigger transient response, treating audiences to a breathtaking audio experience.





Technical data

  • Speaker Type: Active Bassreflex-Subwoofer


Acoustical data

  • Frequency Response [+/- 3dB]: 30 - 110 Hz
  • Max SPL: 139 dB
  • Directivity: Omnidirectional, Cardiod Option with DSP setup
  • LF: 21 "
  • Type LF: RCF Neodymium
  • Voice Coil LF: 4.5 "



  • Amp Technology: digipro
  • Amp Class: Class D
  • Power Supply: 1.5 kW SMPS
  • LF Amp: 1500 W/RMS
  • Cooling: Convection



  • Controller: DSP 56 bit
  • AD/DA Converter: 24bit/ 96 kHz
  • System Presets: X-Over
  • Phase: 0, 180 °
  • Limiter: RMS, Peak, Thermal
  • Delay Option: 0-4.5 ms internal
  • Crossover Frequency LF-MF: DSP, steps of 5 Hz
  • Slope LF-MF: 24 dB/Octave


Input Section

  • Signal Input: 1x XLR fem, sym.
  • Network: RDnet, 2x RJ45
  • Signal Output: 1x Link XLR, male, sym
                          1x X-Over Out, XLR male, sym.
  • Power Socket: Powercon In/Out
  • Voltage Range: 90 - 240 V



  • Housing: Multiplex birch plywood
  • Housing Design: Rectangular
  • Colour: Black
  • Surface Texture: Textured acrylic lacquer
  • Handles: 3x Per Side
  • Pole Mount: M20
  • Front Grille: 1.5mm metall grille
  • Rigging Points: 2xM10 on top to fix DRK10/20 rigging frames
  • Flytracks: No
  • Castors: Optional
  • Width: 580 mm (23.2 in)
  • Height: 800 mm (32 in)
  • Depth: 720 mm (28.8 in)
  • Weight: 52.5 kg (115.74 lbs)

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*Prices are in AUD, include GST and are subject to change. Please call National Audio for pricing and availability on the DVA S1521N.