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© 2008 Directed Electronics. All rights reserved. 7
High-Pass Crossover
When the switch is to the center (FULL position), the high-pass cross-
over is bypassed. When the switch is to the right, the high-pass cross-
over is active. The high-pass crossover is continuously variable from
50Hz to 2000Hz.
Adjusting Bass Boost (XTR 5002 only)
Bass Boost maximizes the performance of a subwoofer and allows for
continuous adjustment of low frequency boost on the rear channels.
Bass Boost can be adjusted from 0dB to 18dB of boost centered at
45Hz. Initially the Q is very low (wide). As Boost 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
capability, personal preference, and attitude determine acceptable
boost levels.
WARNING! Exercise caution when setting Bass Boost. Maximum boost
can potentially cause woofer damage due to over-excursion.
NOTE: While the amplifier allows up to 18dB of boost, it is possible
to clip the amplifier with comparatively low output levels in other
frequency ranges.
Infinite Baffle Subsonic is set at 20Hz
By removing low frequency signal that the woofer cannot produce,
the woofer can play its capable range louder. The first example is
an infinite baffle situation. The first graph displays the frequency
response of a 12-inch woofer in an infinite baffle application without
the high-pass filter. As you can see, with +3dB of boost and the high
pass filter set to 30Hz, the woofer has more output down to 25Hz and
less overall excursion when compared to the non-high-pass response.
Maximum physical excursion capability of the woofer is 15mm.
Figure 4
Figura 4
Abbildung 4
Figure 5
Figura 5
Abbildung 5
NOTE: The first graph is the response; the second graph is the driver
excursion. These designations apply to the following graphs
as well.