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DIGITAL INPUTS
Roll-off response errors are caused by deficiencies in driver performance, driver placement, enclosure design
and vehicle acoustics. This type of response error usually is inaudible in all but the most demanding music.
However for competition systems potential points can be lost with a system that has deficiencies in these areas.
Non-Equalizer Solutions
Changing the tweeter positioning can improve the high frequency response of the system. Modifying the
crossover works exceptionally well in passive crossover design that uses a resistor to attenuate the tweeters output.
This can be accomplished by placing a capacitor between the positive input lead of the crossover and the tweeter
positive output lead. Use a capacitor from this formula [C= 1/(2šRƒ)] where C is the capacitor value in farads, ƒ is
the starting frequency where the roll-off begins and R is the nominal impedance of the tweeter. In the above
situation the nominal impedance is 4 , the starting roll-off frequency is 12,500Hz. The capacitance would be [1/(2 x
3.14 x 4 x 12,500)]. The answer is 3.18 x 10
-
6
F or an approximate 3.3µF. Try larger and smaller values to create
different response curves. For low frequency drivers you can try a different enclosure types or placement.
Equalizer Solutions
In this situation, boosting the DEQ 30 is really the only solution. Care must be taken not to exceed the excursion
limits of the woofers and the power handling of the tweeter. Also, do not exceed the maximum undistorted
output level of the DEQ 30. When you exceed the maximum output level, it is indicated by the illumination of the
“Clip” LED located on the front display panel.
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