If tweeters are installed by “indirect radiation” (big angle default), there are generally too much of these frequencies. The
crossover
can adjust the amplitude on that band.
3) ADAPTATION OF THE SOUND BETWEEN 2.500 HZAND 6.000 Hz
-Next procedure is available on 12dB setting only. If chose 6dB, the cut-off frequency only will be changed.
The
speaker system is adaptable to specific car acoustics. The frequency responce can be optimised according to position and geometric situation of the
speaker by simple changes of the leading wire connections (JUMPER). There are simple and difficult adaptation possibilities, we recommend strictly to start with
the simple ones while pass to the difficult only just after good experience is done. Unnecessary changes by the JUMPER(s) decrease the sound behaviour of the
whole audio system.
1) INTRODUCTION
The crossover is supplied with a default setting. If some speakers do not work or work too much softly as bad sounding, the crossover has to be adjusted again to
the basic settings in order to clarify if mistakes on crossover setting is the real defect reason or not. So you can avoid that you or the dealer have to check the
speaker unnecessarily.
IMPORTANT
DEFAULT SETTING
The FW-HX1 crossover allows you to adjust the tweeter sounding by 6dB or 12dB cut-off slopes (Section 3). It is recommended to
leave the 12dB setting (JUMPER in) so the system achives the full maximum stress and all further possible adjustments can be
made easy. The 6dB setting is suitable for who knows the acoustic advantages only and knows which should be the rigth power
to use on. By this setting, the tweeter is limited “downward” only with a 6 dB cut-off slope. Therefore it must transfer very loading
parts of the midrange (particularly with high capacitances as 10 µF, available by FW-HX1)
2) BASIC SETTING
The crossover offers also the possibility to bridge the PTC (tweeter protection circuit) (Section 1). This operation brings minimal
acoustic advantages, however the tweeter is not protected against overloads. Also this setting is reserved for specialists, who
know the advantages and drive the system with the right power. The “6dB” setting is absolutely dangerous for the tweeter!
HP
12dB
Section3
PTC
Section1
As
for C capacitance, the amplitude within the lower range is reduced. If the amplitude on the cut-off
range is too quiet, the amplitude can also be increased by increasing C. Notice that on variation of capacitance,
the characteristic of the filter will change. By large capacitance, the power which is supplied to the tweeter, strongly
increases.
reduced
dB
Hz
2.000Hz
Section2
4,7 Fµ
3,3 Fµ
2,2 Fµ
0,82ohm 1,5ohm 3,3ohm 4,7uF 3,3uF 2,2uF HP12dB 6dB/12dB 0dB 0,22mH 0,44mH 12uF 18mF PTC
Jumper Jumper Jumper Jumper Jumper Jumper Jumper Jumper
4,7µF 3,3µF 2,2µF Result
- Jumper - 3,3µF decrease 5dB
Jumper - - 4,7µF decrease 3dB
- Jumper Jumper 5,5µF decrease 2dB
Jumper - Jumper 6,9µF basic setting 0dB
Jumper Jumper - 8,0µF increase 2db
Jumper Jumper Jumper 10,2µF increase 5dB
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