TW AUDiO B21

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TW AUDiO B21

TW AUDiO

B21

4.5 Expert Rating

Product Info

Article Number: 607172
Brand: TW AUDiO
Model: B21
Price: $4,229.50

* Prices may vary. Check retailer for current pricing and availability.

The B21 is a serious subwoofer, no question. It’s built like a tank with that birch ply housing and that 21” neodymium driver really moves a lot of air. If you're running a large sound reinforcement system for concerts or events where deep, impactful bass is critical, this is a fantastic option, but be prepared for a workout moving it.

Product Description

  • TW AUDiO B21
  • Passive 21" Low-Frequency Subwoofer
  • Power rating: 3600 W RMS
  • 7200 W peak
  • Equipped with: 1x 21" long excursion chassis (neodymium)
  • Max. sound pressure level: 137 dB
  • Frequency range: 27 Hz - 125 Hz
  • Impedance: 8 ohm
  • Connectors: Two Speakon NL4
  • Housing material: Multiplex birch wood
  • Eight handles for ergonomic handling of the box
  • Two M20 mm stand flange mounts
  • Dimensions (W x H x D): 606 x 706 x 800 mm
  • Weight: 54.5 kg
  • Colour: Black

*Note:* Operation recommended with dedicated TW AUDiO presets on LAB groups, Powersoft or Dynacord TGX and IPX amplifiers

PROS
  • • Neodymium driver delivers exceptional efficiency and low-frequency extension.
  • • Multiplex birch construction ensures robust build and excellent resonance damping.
  • • Handles facilitate easy maneuverability despite the substantial weight.
  • • 137dB SPL capability provides serious headroom for large venues.
CONS
  • • High weight makes transportation and setup challenging for smaller teams.
  • • Limited frequency response restricts versatility for some music genres.
  • • Requires powerful amplification, adding to overall system cost.

Product Video

Key Features

Power Handling 3600 W RMS / 7200 W Peak
Woofer Size 21"
Impedance 8 ohm
Frequency Range 27 Hz - 125 Hz
Sensitivity Estimated 103 dB SPL (1W/1m) - typical for this class of subwoofer
Weight 54.5 kg

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Frequently Asked Questions

Yes, the multiplex birch offers excellent damping, minimizing cabinet vibrations and contributing to a cleaner, more defined low-end response.
While capable, it's really overkill for smaller spaces; the power and SPL output are best suited for larger rooms and outdoor events where significant low-frequency reinforcement is needed.
The B21 offers a compelling performance profile, trading some of the absolute refinement of top-tier brands for a more accessible price point, while still delivering substantial low-end power.

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