!
!
F
LP
0dB
-3dB
-6dB
1,33
0,50
0,73
1,04
+2dB
Q
LP
In case your head-unit features a
special
adjustable fullrange signal Sub-Level-Output
,
the REMOTE SUB LEVEL CONTROLLER should
only be used for the basic Sub Level Setting
(see step 3 above). Any individual subwoofer
level adjustment can then be effected from
the respective Sub Level Menu of your
head-unit.
It is therefore possible to unplug the REMOTE
SUB LEVEL CONTROLLER from the XP500.1
amplifier after completion of the basic level
setting and keep the controller and the cable
for a later use.
IMPORTANT NOTICE!
The XP500.1 will always
store the last Sub Level Setting value effected
via the REMOTE SUB LEVEL CONTROLLER
even after turning off the amplifier, i.e. dis-
connecting the XP500.1 from the power leads!
The last Sub Bass Level Setting will be stored
in the memory of a EEPROM chip inside the
XP500.1 amplifier.
F
LP
Fine-Tuning of LOWPASS
Frequency Setting
Ideally the LOWPASS cut-off frequency F
LP
for
the subwoofer should be set between 50 and
90 Hz. Adjust the SUB-BASS LEVEL of the
XP500.1 on the remote dashboard controller.
A good SUB-BASS LEVEL setting will give you
a homogenous overall sound with strong bass
response.
Now you can start the actual fine-tuning of the
LOWPASS frequency which should be ‘played
entirely by ear’. The optimal bass reproduction
will be stiff and rich, while still delivering a
good and solid low-end bass.
In general, setting the LOWPASS cut-off fre-
quency F
LP
too low will result in a weak and
uncontoured bass response.
Setting the LOWPASS control F
LP
too high will
result in a ‘booming’ sound.
Q-Factor Control Settings
Lowpass Q-FACTOR Setting Q
LP
In general the Q
LP
control should be set to the
center position Q = 0,73.
A Q-FACTOR CONTROL allows the active
control of the damping Q(uality) of the sloping
filtering/cut-off curve at the desired cross-
over/cut-off frequency point, in this case the
LOWPASS frequency F
LP
(see fig. 2)
A setting of Q
LP
0,73 represents the standard
„Butterworth“ audio amplitude slope.
Decreasing the Q
LP
value towards 0,50 will
result in a) shifting the cut-off point slightly
backwards and b) decreasing the slope angle
of the filtering/cut-off curve at the desired
cross-over/cut-off frequency point F
LP
(see
fig. 2). Therefore decreasing the Q
LP
factor
value can be used as a measure to suppress a
‘booming’ tendency of the subwoofer without
having to select a lower lowpass frequency
setting.
23
0dB
-3dB
-6dB
F
HP
1,33
0,50
0,73
1,04
-2dB
Q
HP
Fig. 2
Fig. 3
4
B
5
110998 Man XP500.1 RZ (D+UK) 14.10.1998 9:34 Uhr Seite 23
