Definitive Technology IW Sub Reference

A deep-bass powerhouse that disappears in your room, with a non-resonant sealed enclosure and paintable bezel and grille.

The IW Sub Reference includes a special shallow-depth, long-excursion active 13″ driver pressure-coupled to its Ultra-Low Bass Radiator to produce deep, formidible bass.

  • More Bass for Your Space
  • Deep, Deep Lows
  • Easy to Install


Ultra-Low Bass Radiator for expansive depth

The active 13” woofer and 13″ Ultra-Low Bass radiator boast a combined bass radiating surface area of over 265 square inches—more than an 18” woofer but with greater speed and control for tighter, deeper, more powerful bass.


The SubAmp 600 for real low-end power

The IW Sub Reference is externally powered, so there’s no need for installers to run electrical to the in-wall subwoofers. The outboard SubAmp 600 (required, not included) can power up to two IW Sub Reference subwoofers, even in different rooms.

With this unbeatable combination, installers enjoy the same ease of installation with in-wall subs as they do with in-wall speakers.


Fully Enclosed for powerful sound where you want it

To play bass in the room it’s intended for, rather than spilling into adjacent rooms via walls and ceilings, The IW Sub Reference is fully enclosed and sealed with dense, acoustically inert, anti-resonant, anti-vibration Medite® wood. You’ll hear tight, powerful bass with no distortion or buzzing.


Paintable Grilles for the final custom touch

The IW Sub Reference’s grille is paintable, with easy step-by-step instructions.

Carton 1 (W x H x D) ; Weight495.3 x 762 x 266.7mm (19.5″ x 30″ x 10.5″) ;
20.41kg (45 lbs)
Required Accessories1x SubAmp 600
In-Wall and In-Ceiling
Qty Included1
Grille Dimensions (W x H)393.7 x 665.2mm (15.5″ x 26.19″)
Dimensions (W x H)365.3 x 638.3mm (14.38″ x 25.13″)
Total Frequency Response14 Hz → 200 Hz
Nominal Impedance4 ohms
Audio Inputs
Speaker Inputs1x Pair of Heavy Duty, Spring Loaded – na