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 | | |
| | | | | | |
8 | © 2005 Directed Electronics—all rights reserved |
