Scanspeak 18WU/4747T00 Illuminator 18cm 4 Ohm woofer. A radical rethink in drive unit design.

This 18cm 4 Ohm woofer is the culmination of many years research at Scanspeak R and D, Videbaek, Denmark and brings together a host of advancements.
Featuring a rigid aluminium alloy cone, copper capped pole piece & huge linear excursion, this audiophile quality driver operates as a pure piston. The unique airflow optimised open chassis and underhung Neodymium SD-3 magnet system define new standards in terms of minimal compression & reflection.
Delivering highly accurate bass reproduction with great authority, extension and texture, we believe this is possibly the finest 18cm dedicated woofer available.
Available in 4 and 8 ohms.
Key Features:
- Under-Hung Neodymium Motor Design
- Black Anodised Aluminium Alloy Cone
-
Exceptionally Long Linear Excursion
- Patented Symmetrical Drive (SD-3)
- Low-loss linear suspension
This woofer is 4 Ohms ; the 8 Ohm version is here : 18WU/8747T00
Basic parameters:
Resonant frequency (fs) |
32 Hz |
Nominal impedance (Zn) |
4 Ω |
Mechanical Q factor (Qms) |
3.42 |
DC resistance (Re) |
3.2 Ω |
Electrical Q factor (Qes) |
0.30 |
RMS power handling |
80 W |
Total Q factor (Qts) |
0.28 |
Sensitivity (2.83V/1m) |
88.1 dB |
Equivalent volume (Vas) |
48.3L |
Chassis diameter |
184 mm |
Here's the full datasheet:
