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© 2005 Directed Electronics—all rights reserved
WARNING! DO NOT set crossover frequencies lower than the speakers recommended
operating range. This can cause driver failure that is not covered by the man-
ufacturer's warranty.
Low-Pass Crossover
The low-pass crossover adjusts the upper crossover of the filter and is continuously variable
from 30Hz to 250Hz.
Fine Tuning the Crossovers
The low-pass and high-pass crossover sections are each marked at four frequency points for
ease of system adjustment. The low-pass crossover section is marked at 30Hz, 50Hz, 150Hz,
and 250Hz. The high-pass crossover section is marked at 20Hz, 33Hz, 90Hz and 150Hz.
Specific crossover points can be chosen based on the recommended operational bandwidth
of your speakers.
Adjusting INTELLi-Bass
INTELLi-Bass on the rear channels maximizes the performance of a subwoofer and allows
for continuous adjustment of low frequency boost on the rear channels. INTELLi-Bass can be
adjusted from 0dB to 18dB of boost centered at 45Hz. Initially the Q is very low (wide). As
INTELLi-Bass is added, the Q rises (narrows). This allows the amplifier to overcome acoustic
deficiencies in your vehicle. The type of enclosure used, the sub-woofer's excursion capabil-
ity, personal preference, and attitude determine acceptable boost levels.
WARNING! Exercise caution when setting INTELLi-Bass. Maximum boost can potentially
cause woofer damage due to overexcursion.
Enclosure Type Boost Levels
0dB +3dB +6dB +10dB
Infinite Baffle Tune above High X-Max Not Not
Fs of woofer Drivers--Tune Recommended Recommended
above Fs of
woofer
Sealed Tune above Tune above High X-Max Not
Fs of woofer Fs of woofer Drivers--Tune Recommended
above Fs of
woofer
Vented Tune to port Tune to port Tune to port High X-Max
frequency frequency frequency Drivers--Tune to
port frequency
Sealed Band-pass Tune above Tune above High X-Max Not
Fs of woofer Fs of woofer Drivers--Tune Recommended
above Fs of
woofer
Vented Band-pass Tune to port Tune to port Tune to port High X-Max
frequency frequency frequency Drivers--Tune to
port frequency
Aperiodic Set crossover Set crossover Set crossover Not
to Fs of to Fs of to Fs of Recommended
woofer woofer woofer