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dB Technologies SUB 28 D


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Product Overview

Active 2 x 8 Subwoofer

We engineered the SUB 28 D to provide low-end reinforcement for compact satellites such as dBTechnologies L and K Series speakers. This light and lean enclosure houses two 8“ woofers driven by a 400W digital power amp and an onboard digital stereo x-over. Setting up mono and stereo satellite systems is a piece of cake with this amp and DSP on board.

The Subwoofer Company
dBTechnologies is well known for its remarkable active subwoofers with outstanding performance, combining powerful and precise subsonic reproduction with excellent tonal quality. The dBTechnologies’ bandpass design guarantees a well balanced reproduction of sound but adding a few dB SPL extra, compared to regular bass-reflex designs. The result is maximum performance, out of a very compact and lightweight enclosure.

Active Crossover – Easy Setup
All powered subwoofers are equipped with an active crossover, which can operate in Mono or Stereo mode, providing all combinations for applications with one or more subwoofers.

digipro® digital amplifiers – More power and less weight
With digital power amps lightening the load, toting and setting up these bins is an exercise in convenience. This handling ease is an asset users are sure to value, particularly those frequently tasked to set up and tear down systems for live applications.

H.E.T (Hybrid Enclosure Technology)
Exceptionally light and remarkably rugged Developed by dBTechnologies, H.E.T housings are made of premiumquality multiply wood with a hardwearing, durable, and scratch-resistant coating. Tough, rugged plastic side panels provide excellent protection for the housing as well as integrated grips and electrical connectors for utmost handling convenience and safety.





Technical data

  • Speaker Type: Active Bandpass Subwoofer


Acoustical data

  • Frequency Response [-10dB]: 45 - 150 Hz
  • Max SPL: 125 dB
  • Directivity: omnidirectional
  • LF: 2x8 "



  • Amp Class: Class D
  • Power PRG: 400 W
  • Cooling: Convection



  • Controller: DSP 24 bit/ 48 kHz
  • Phase: 0, 180 °
  • Limiter: Dual Active Limiter
  • Crossover Frequency LF-MF: 2 setups Hz
  • Slope LF-MF: 24 dB/Octave


Input Section

  • Signal Input: 2x XLR
  • Signal Output: 2x XLR Link Out/X-Over Out
  • Power Socket: VDE



  • Housing: H.E.T
  • Housing Design: Square
  • Colour: Black
  • Surface Texture: Textured acrylic laquer
  • Castors: No
  • Handles: 1x per side
  • Pole Mount: 1x 36mm on top
  • Front Grille: Wooden
  • Width: 290 mm (11.6 in)
  • Height: 520 mm (20.8 in)
  • Depth: 505 mm (20.2 in)
  • Weight: 19.5 kg (42.99 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 SUB 28 D.

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