Martin Audio W8L Longbow Application Manual page 72

Main system (upper) with matching short side stretch array (lower)
5.7 Subwoofers and front fills
5.7.1 Subwoofer crossover and alignment
Crossover frequencies
Recommended W8L series high pass (low cut) filters are as follows:
Loudspeaker Type
W8L Longbow
W8LC, W8LD or W8LCD
W8LM or W8LMD
Different combinations of W8L series line arrays (including down- fills) and
commonly used subwoofers require accurate alignment. Optimum initial delay offsets
will depend on the type of subwoofer to be used. For instance, direct radiating
subwoofers usually need to be delayed back to horn-loaded W8LC, W8LCD,
Longbow or W8LD loudspeakers whereas most W8L series full- range line arrays will
need to be delayed back to larger horn- loaded subs like the WSX and the WLX.
Optimum crossover frequency settings will also vary depending on the combination.
Horn- loaded line array LF sections may be overlapped with horn-loaded subwoofers to
increase mid-bass headroom and projection whereas a more defined crossover without
a wide overlap is required to combine horn- loaded line array LF sections with direct
radiating subs because they have different phase vs frequency responses.
Please print off the chart on the following page and attach in inside the back of your
subwoofer racks for reference.
It is very important for you to start off with these reference settings before attempting
to time align your system for any physical misalignment.
Factory preset default
35Hz 24dB/8ve L-R
60Hz 24dB/8ve L-R
70Hz 24dB/8ve L-R
All material © 2007. Martin Audio Ltd. Subject to change without notice.
Full-range (without subs)
25Hz 24dB/8ve L-R
30Hz 24dB/8ve L-R
30Hz 24dB/8ve L-R