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Subwoofers may be flown above or beside main systems (using the appropriate W8L
Series flying systems or adaptors) or they may be stacked on the floor. Smaller main
systems may be stacked on top of the sub woofers with good results.
If systems have to be physically misaligned, when sub woofers are ground stacked in
front of a stage wing for instance, extra delay may be employed to compensate for the
differing arrival times.
Please note:
Electronic delay can only compensate for physical misalignment with reference to a
specific listening area - usually a listening reference point e.g. the mix position. In the
following example, aligning for maximum impact at the mix position will compromise
bleacher impact and vice versa.
Subwoofers may be time aligned without sophisticated test gear as follows:
1) Start with the recommended initial controller settings – see previous table
2) Use a laser tape measure to measure the distance to the main system grille and the subwoofer grille
3) If the subwoofers are closer than the main system, increase the subwoofer system controller delay
(Use 2.91ms for every meter of misalignment). If the main system is closer than the subwoofers,
increase the main system delay
4) Fine adjust the delay to compensate for boundary conditions (see explanation on next page) using
the null method - switch the subwoofers to reverse polarity, and listen to a 70Hz tone on the main
system & subs from the mix position. Fine trim the delay for a dip in level.
(Note that you must complete items 1 to 3 before starting item 4 or you could end up
with a system that is misaligned by a complete wavelength at 70Hz!)
5) Don't forget to switch the subwoofers back to normal polarity for maximum summation and impact!
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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