CD
Input
Gain
Adjustment
Control
Set
the
R-A75M/R-A60F
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.
® Crossover Frequency Adjustment Knob
(LP
FILTER)
(R-A75M only)
Use
this control
to
adjust
the
crossover
frequency between 50 Hz
to
400
Hz.
@
Bass
EQ
Adjustment
Knob (R-A7SM only)
Add a 50 Hz
bass
boost
up
to+
12
dB
to
tune
your
bass response.
@ Subsonic Filter (R-A75M only)
The subsonic filter
is
for
cutting
ultra
low
frequencies
from
the
input
signal before being
amplified. Frequencies lower than
the
specified
frequency
are
attenuated at 24 dB/octave.
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.
® Speaker
Input
Level Switch
Switch according
to
the
Speaker
input
mode.
~
LO
HI
INPUT
LEVEL
~
LO
HI
INPUT
LEVEL
a)
When making a speaker
input
connection
with
RCA
Extension
Cables (sold separately), set
to
"LO''.
b) When making a speaker
input
connection
with
Speaker-
RCA
Conversion Cables (sold separately),
set
to
"HI''.
® Crossover
Mode
Selector Switch
(CHANNEL-1/2) (R-A60F only)
i§n
,J
OFF
HP
LP
HP
·H
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.
w
OFF
HP
LP
HP·H
FILTER
m
OFF
HP
LP
HP·H
FILTER
g
OFF
HP
LP
HP·
H
FILTER
b)
Set
to
the
"HP" position when
the
amplifier
is
used
to
drive a
tweeter/
midrange system.
At
this setting, Crossover Frequency
Adjustment Knob ((J)) provides
adjustment between 50 Hz
to
400
Hz.
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.
At
this setting, Crossover Frequency
Adjustment Knob ((J)) provides
adjustment between 50
Hz
to
400
Hz.
The frequencies above
the
crossover
point
will be attenuated
at
12 dB/octave.
d) Set
to
the
"H P-H" position when
the
amplifier
is
used
to
drive a tweeter
system.
At this setting, Crossover Frequency
Adjustment Knob (@) provides
adjustment between 400 Hz
to
6
kHz. The frequencies below
the
crossover
point
will be attenuated
at
12
dB/octave.
0 Crossover Frequency Adjustment Knob (HP/
LP
FREQ.)
(R-A60F only)
Use
this control
to
adjust
the
crossover
frequency between 50 Hz
to
400
Hz.
® crossover Frequency Adjustment Knob (HP-H
FREQ.) (R-A60F only)
Use
this control
to
adjust
the
crossover
frequency between 400
Hz
to
6
kHz.
@
Input
Channel Selector Switch (CHANNEL-3/4)
(R-A60F only)
w
1/2
3/4
INPUT
CHANNEL
m
1/2
3/4
INPUT
CHA
NNEL
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
.
9
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