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Concert Series Owner’s Manual
7200
Frequency (in Hz)
EXAMPLE – For a 25 Hz filter, the
formula yields a resistor with a value of
7200
25
NOTE: Use only resistors having a tolerance of
five percent or better (i.e., 5%, 2%, etc.).
WARNINGWARNING
WARNINGWARNING
WARNING
TURN OFF THE SYSTEM BEFORE CHANG-
ING THE MODULE, OR ELSE SOMETHING
IN YOUR SYSTEM WILL BE DAMAGED!
CAUTION: The Programmable Frequency
Match Module must always be installed, even
if you are not using the filter. Failure to do so
may damage the EQL.
Making YMaking Y
Making YMaking Y
Making Y
our Ownour Own
our Ownour Own
our Own
Programmable FProgrammable F
Programmable FProgrammable F
Programmable F
requencyrequency
requencyrequency
requency
Match ModulesMatch Modules
Match ModulesMatch Modules
Match Modules
The EQL comes with an 18 dB per octave
Programmable Frequency Match low-cut filter
module already set to 33 Hz. This will act as a
subsonic filter, protecting your woofers. If you
have large woofers (i.e., 12" or 15"), you may
want a lower frequency module. With smaller
woofers (i.e., 6" or 8"), use a higher frequency
Programmable Frequency Match module.
Additional modules with pre-set frequencies
are available from an authorized AudioControl
dealer, or you can create a custom low cut filter
module by using the following formula
4
:
4
For more details, read our — (HEY! Not another #%*&% plug
disguised as a #%*&% footnote!) — ok, OK, OKAY! — We’ll make a
deal with you. Send us ten bucks, and we’ll send you the whole
set of Tech Papers and Tech Notes (which includes our Techni-
cal Note #1005 Crossovers Modules). And you won’t have to
read another tiny footnote — unless you want to.
= Resistor Value (in kohms)
= 288 kohms
18
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