Martin Audio Wavefront W8CT, Application Manual

Page: 109 / 247

4.7.1 Array shapes vs coverage
WSXs may be stacked and arrayed to increase sound pressure and tailor coverage.
The sound pressure increase is intuitive but the significance of subwoofer array
shapes and sizes is often overlooked.
The following table shows the sound pressure boost and coverage provided by a
variety of flat fronted arrays:
Array Approx Boost Horizontal Vertical
(wrt single unit) coverage coverage
- Wide Wide
+12dB Wide Narrow
+12dB Narrow Wide
+24dB Narrow Narrow
In these examples “wide” means that there are no coverage nulls within the forward
180º at mid-bass crossover frequencies. Wide coverage arrays have significant output
beyond 180º making them more prone to room colouration.
“Narrow” means that coverage will drop significantly before 180º coverage is reached
at the mid-bass crossover frequency.
General rules:
♦
The larger the array the more directional it becomes
♦
A larger, directional system will be less affected by the room
♦
We get a 6dB far field sound pressure boost every time we double the number of
cabinets
Stacking safety!
Stacked WSXs should always be blocked, strapped and anchored from above by
a qualified rigger.
All material © 2007. Martin Audio Ltd. Subject to change without notice.