SWITCH SETTINGS
NOTE:
• Before switching each Selector Switch, turn
off
the power and insert a small screwdriver, etc.,
perpendicularly
to
the Switch.
0
CD>
m
~
bM
b'"
CH-314
00
--:
ON
•:~oo~
J:J!t
~'~N
::q
HP
FILTER
CROSSOVER
GAIN
HP
FILTER
CROSS
SUBW
"0:
00
~~
~
MIN
(Hz)
40
SO
(Hz)
400 0
(dB
SUBSONIC
CROSSOVER
BASS
0
CD>
m m
~~
00
~~
~,~~m
~
'"
~•
~
~•
OFF
ON
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,,.m,.,
112
3/4
SOVER
GAIN
HP
FILTER
CROSSOVER
GAIN
INPUT
CHANNEL
SUBW.
"~:
00
m~
0
d).
P.(Hz)
40
~(Hz)
400
r-?(dB)
+12
p
MAX
1+2+3+4
SUBW.
~~SONIC
~~ssovER
~~ss
Ea
1
_GAIN
INPUT
cHANNEL
«8
CD>
«D
m
«D
Fig.
10
0 Crossover
Mode
Selector Switch
~
OFF
ON
HP
FILTER
~
OFF
ON
HP
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 "ON" 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.
G)
Crossover Frequency Adjustment Knob
Use
this control
to
adjust the crossover
frequency between
50
and 400Hz.
«D
Input Gain Adjustment Control
Set
the
PDR-V75
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.
«B
Input Channel Selector Switch
~
1/2 3/4
INPUT
CHANNEL
~
1/2 3/4
INPUT
CHANNEL
a)
This switch setting
is
for selecting
either 2-channel or 4-channel
input
mode. When set
to
"1
/2': signal will
be copied from
CH-1
/2 and sent
to
CH-3/4, eliminating the need for
Y-adapters.
b)
Setting this switch to "3/4" will keep
both inputs, CH-1/2 and CH-3/4
independent.
A 4-channel source
is
required for
this mode.
«8
Subsonic Filter
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.
9-EN
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