Alpine PDR-M65 - SWITCH SETTINGS; Subsonic Filter (PDR-M65 only); Crossover Frequency Adjustment Knob; Bass EQ Adjustment Knob (PDR-M65 only)

SWITCH SETTINGS
NOTE:
• Before switching each Selector Switch, turn off
the power and insert a small screwdriver, etc.,
perpendicularly
to the Switch.
.PDR-M65
~ CD 48
-~~J~:-~~-<0:> .,-J-~~.=AX =-48
SUBSONIC LP FILTER BASS EQ GAIN
Fig. 11
• PDR-FSO
«D CD
CHANNEL-112 ~ ~~- ~;-.....--....,
JFF HP LP
50
(Hz) 400 MIN MAX dt----~
---I FILTER CROSSOVER GAIN _ W
CHANNEL- 3/4 80 NOM
,.~. ~· '~I, .e~. IJJ Ql
FILTER CROSSOVER BASS EQ GAIN INPUT CHANNEL
Fig. 12
~Subsonic Filter (PDR-M65 only)
The subsonic filter for cutting ultra low
frequencies from the input signal before being
amplified.
This
is desirable for several reasons:
-To protect speakers too small or not capable
of reproducing ultra low frequencies.
-To minimize power wasted from reproducing
inaudible sound.
-To protect subwoofers in vented enclosures
from over excursion below the
tuning
frequency.
CD Crossover Frequency Adjustment Knob
(PDR-M65:
LP FILTER)
Use this control to adjust the crossover
frequency between
50 to 400Hz.
48 Bass EQ Adjustment Knob (PDR-M65 only)
Add a 50 Hz bass boost up to+ 12 dB to tune
your
bass response.
48 Input Gain Adjustment Control
Set the PDR-M65/PDR-F50 input gain to the
minimum position. Using a dynamic
CD as a
source, increase the head unit volume until the
output distorts. Then, reduce the volume 1 step
(or until the
output is no longer distorted). Now,
increase the amplifier gain until the sound from
the speakers becomes distorted. Reduce the
gain slightly
so the sound is no longer distorted
to achieve the optimum gain setting.
«D Crossover Mode Selector Switch (PDR-FSO
only)
~
OFF HP LP
FILTER
~
OFF HP LP
FILTER
~
OFF HP LP
FILTER
a) Set to the "OFF" position when the
amplifier will be used for driving
full range speakers or when using
an external electronic crossover.
The full frequency bandwidth will
be
output to the speakers with no
high or
low frequency attenuation.
b) Set to the "HP" position when the
amplifier
is used to drive a tweeter/
midrange system. The frequencies
below the crossover
point will be
attenuated at 12 dB/octave.
NOTE:
• In this case the maximum Bass EQ
boost level is reduced.
c) Set to the "LP" position when the
amplifier
is used to drive a
subwoofer. The frequencies above
the crossover
point will be
attenuated at
12 dB/octave.
9-EN