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7. ADJUSTMENT OF THE CONTROL FUNCTIONS
7.3 SELECTING A CROSSOVER FREQUENCY POINT FOR THE KICKBASS
SPEAKERS
For a front door installed 16cm kickbass system - consisting of one up to four 16cm kickbass speaker
units per door - the OPERATION MODE switch must be set to LP/BP and the push button switch must
be set to BP. This mostly concerns channel pair 3/4-CH (only applicable for the EA4150), while chan-
nel pair 1/2-CH will be used to drive the satellite system mounted in the front doors. So the OPERA-
TION MODE switch of 1/2-CH section must be set to HP, if this is the case.
The cross-over frequency point settings should be chosen according to the recommendations below:
Kickbass Speakers System ("LP/BP" enabled, 3/4-CH)
HI PASS
LOW PASS
1 x 16cm kickwoofer unit per front door
100 - 110Hz
200 - 300Hz
2 x 16cm kickwoofer units per front door
90 - 100Hz
200 - 300Hz
3 x 16cm kickwoofer units per front door
80 - 100Hz
200 - 300Hz
7.4 LOWPASS CROSSOVER FREQUENCY ADJUSTMENTS FOR SUB-
WOOFERS
Select the switch position "LP/BP" on the OPERATION MODE CONTROL switch, to activate the low-
pass filter of the integrated electronic crossover.
Before you can attempt to find the sonically best lowpass crossover frequency point, you must set the
subsonic highpass filter control (when "BP" mode is turned on) to its lowest position (10Hz), so it will
not interfere with the lowpass crossover frequency adjustment.
Close the electrical circuit by inserting the main fuse. Now switch on your head unit. The green OPE-
RATING LED of the amplifier should light-up. If the LED lights up red, your installation is faulty! Turn
off the head-unit and carefully re-check previous installation steps!
The LOW PASS cut-off frequency point setting depends on the amplitude response and the frequency
extension of the installed subwoofer system. As a rule of thumb, settings in a range between 60 to 90
Hz will render best sonic results. This setting is mostly a matter of taste, and should therefore be 'play-
ed by ear'. Turn up the input gain control knob to "noon" position on the corresponding channel pair,
and turn on your head unit. Now set the desired lowpass frequency by adjusting the LOW PASS fre-
quency control knob. In general, setting the lowpass cross-over frequency too low, will result in a weak
and muddy sounding bass, while setting this crossover frequency too high will result in a 'booming'
bass sound and reduced low end extension.
EA 2/4-CH Manual 12.03.2002 12:55 Uhr Seite 16
