AudioControl Architect 500, Installer'S Manual

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The Architect
Model 500 & Model 700
Installer’s Guide
lower frequencies which either can’t be reproduced or which incite
excessive cone travel.
The equalization part is handled by The Architect
®
Model
700’s 45Hz control. The prevention part is handled by The Archi-
tect
®
Programmable Frequency Match filter circuit. While it may
seem surprising, actually cutting off some of the lowest bass will
make the bass sound cleaner, punchier and even louder.
AudioControl’s Programmable Frequency Match circuit is an
adjustable subsonic filter which cuts off low frequencies. The PFM
filter’s cut-off point is adjustable via a small resistor module inside
The Architect
®
. When you receive your unit, it is programmed
with a 40Hz bass cut-off. Depending on the application, you may
want to change the filter frequency. Don’t let ego get in the way
and set the PFM too low because somebody thinks that a 6”
woofer should be able to play down to 20Hz.
The following standard module frequencies are available from
AudioControl: 20, 25, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120,
130, 150, 200, and several higher frequencies going up to 6000Hz
which probably aren’t applicable except in very special circum-
stances. Each module’s frequency is determined by 6 resistors
inside a 14-pin DIP network. See Appendix A for details on
building your own modules.
The Truth About
Bass & The
Programmable
Frequency
Match Filter
Close-up view of PFM Modules
Note: The modules are not
directional so it does not matter
which way they are inserted.
15
PFM rolloff curve