7 Battery Lead
8 Remote T
9 Ground Lead
- Insulation T
a Battery Lead (Y
Be sure to add a ★ 50 amp fuse (or two 25A fuses in
parallel) as close as possible to the battery's positive
(+) terminal.
electrical system in case of a short circuit. If you need
to e
or larger
★ MR
parallel)
MR
parallel)
MR
b Remote
Connect this lead to the remote turn-on or power
antenna (positiv
head unit.
c Ground Lead (Black)
Connect this lead securely to a clean, bare metal spot
on the vehicle's chassis
ground by checking for continuity between that point
and the negative (–) terminal of the vehicle's battery
Ground all your audio components to the same point
on the chassis to prevent ground loops.
CONNECTIONS (Fig. 2 – Fig. 10)
Before making connections, be sure to turn the power
off to all audio components.
lead from the amp directly to the positive (+) terminal
of the vehicle's battery
fuse block.
T
system.
• Locate the unit and route the leads at least 10 cm
away from the car harness.
• Keep the battery power leads as far away from
other leads as possible.
• Secure the ground lead to a location connected to
the car’
dirt, grease or paint to insure a good connection.
• If you add an optional noise suppressor
as far a
dealer carries various noise suppressors, contact
them for further information.
• Y
prevention measures so consult your dealer for
further information.
1 , 2 RCA Input Jacks (CH3/4), (CH1/2)
Connect these jacks to the line out leads on your head
unit using RCA extension cables (sold separately). Be
sure to observe correct channel connections; Left to
Left, Right to Right, F
3 , 4 RCA Pre-out Jacks (CH1+3), (CH2+4)
5 , 6 Speaker Output
The MR
speaker outputs. Be sure to observe correct speaker
output connections and phasing. In the stereo mode,
connect the right speaker outputs to the right speaker
and the left to left. Connect the positive output to the
positive speaker terminal and the negative to negative.
In the bridged mode, connect the left positive to the
positive terminal on the speaker and the right negative
to the negative terminal of the speaker
speaker (–) terminals as a common lead between the
left and right channels. Do not connect this lead to the
vehicle's chassis ground.
NOTE:
Do not connect speaker leads together or to chassis
ground.
SWITCH SETTINGS
The switch modes shown are for CH1/2. Same
explanations apply to mode selection for CH3/4.
d Input Mode Selector Switch
a) Set to the "ST" position (center) when
the two channels are used in stereo.
The CH-1 (or CH-2) input will output at
the Speaker Output
CH-2).
b) Set to the "1" position when the two
channels are used for one channel of a
stereo bridged system.
c) Set to the "1 + 2" position when the two
channels are used for a subwoofer
system which uses the right channel
and left channel signals summed.
e , i Crossover Mode Selector Switch
a) Set to the "ON" position when the
amplifier is used to drive a subwoof
The frequencies above the crossover
point will be attenuated at 12 dB/
octave.
b) Set to the "OFF" position when the
amplifier will be used for driving full-
range speak
bandwidth will be output to the
speakers with no high or low frequency
attenuation.
f , k Frequency Multiplication Switch
a) "X1": Normal crossover frequency (50
to 400Hz)
b) "X20":
multiplied by 20 (1k to 8 kHz).
g , j Crossover Mode Selector Switch
a) Set to the "ON" position when the
amplifier is used to drive a tweeter/
midrange system.
below the crossover point will be
attenuated at 12 dB/octave.
b) Set to the "OFF" position when the
amplifier will be used for driving full-
range speak
bandwidth will be output to the
speakers with no high or low frequency
attenuation.
h Input Mode Selector Switch
a) Set to the "ST" position (center) when
the two channels are used in stereo.
The CH-3 (or CH-4) input will output at
the Speaker Output
CH-4).
b) Set to the "3" position when the two
channels are used for one channel of a
stereo bridged system.
c) Set to the "3 + 4" position when the two
channels are used for a subwoofer
system which uses the right channel
and left channel signals summed.
l Input Channel Selector Switch
a) Setting this switch to 1/2 will send the
signal at the inputs of CH1/2 to CH3/4
of the MR
F305.
adaptors when using a head unit with a
single pair of pre-amp output.
b) Set this switch to 3/4 to have the inputs
of CH3/4 accept independent input
signals.
would be the use of a head unit with
dual pre-amp outputs.
c) Setting this switch to 1 + 3/ 2 + 4 will
sum the CH1 and CH3 input and send
it to CH3 while the CH2 and CH4
inputs are summed and sent to CH4.
When used with a dual-preamp output
head unit, this will provide a non-fading
(constant bass) subwoofer output with
fadable front and rear output going to a
separate Satellite amplifier
m Input Level Selector Switch
Set to the "4V" position when the head unit with 4V
output voltage is used.
When the head unit with non-4V output voltage is used
at the "4V" position, the volume will be decreased.
n , r Cr
When the frequency multiplication switch is set to the
"X1" position, the crossover frequency can be adjusted
in the range of 50 to 400Hz.
When the frequency multiplication switch is set to the
"X20" position, the crossover frequency can be
adjusted in the range of 1k to 8 kHz.
o , q Cr
P
rotating the knob to select any frequency between 50
to 400 Hz as the crossover point.
p , s Input Gain Adjustment Contr
Set the MR
knobs to the minimum (4V) position. Using a loud
cassette or preferably a CD as a source, slowly turn
up the head unit volume until you just hear the sound
distor
the distortion is no longer audible. Keep head unit
output at this level and begin increasing the amplifier
gain until the maximum output level you desire is
reached.
amplifier
bottoming of the speakers or excessive distortion of
the amplifier
1 ST 1+2
1 ST 1+2
1 ST 1+2
1 2
25A
BATTERY REMOTE GND
POWER SUPPLY
–
–
+
–
+
+
BRIDGED
CH-2
INPUT
CH-3
CH-4
(R)
CH-1
–
+
–
+
CH-4 CH-3
SPEAKER
OUTPUT
FUSE
CH-1
(L)
CH-2
CH-1+3
CH-2+4
(R)
(L)
PRE
OUT
25A
25A 25A
3 4 5
6
7
8 9
-
a
b
c
(MR
1 ST 1+2 3 ST 3+4 1/2 3/4 1+3/2+4 ON
X
1
X
20 OFF ON OFF ON OFF ON NOM 4V
X
1
X
20
LP
INPUT MODE
CHANNEL-1/2
HP INPUT MODE LP HP
CHANNEL-3/4
INPUT CHANNEL INPUT LEVEL
4/3/2 CHANNEL POWER AMPLIFIER
MRV - F505
d e f g h i j k l m
★
V
12
DC STRAIGHT
150/3K
100/2K
70/
1.4K
50/1K
(Hz)
400/8K
300/
6K
200/4K
150
50 400
200
NOM
MIN MAX
0.5V
CHANNEL-3/4
(Hz)
100
70 300
(Hz)
NOM
MIN MAX
0.5V
150
50 400
200
100
70 300
(Hz)
150/3K
100/2K
70/
1.4K
50/1K 400/8K
300/
6K
200/4K
CHANNEL-1/2
n
o
q r
s
p
n
o
LP HP GAIN
Fig. 2
OFF ON
OFF ON
1/2 3/4 1+3/2+4
1/2 3/4 1+3/2+4
1/2 3/4 1+3/2+4
X
1
X
20
X
1
X
20
OFF ON
OFF ON
3 ST 3+4
3 ST 3+4
3 ST 3+4
★ When adjusting the knobs n – s , remove two hexagon screws by using the hexagon wrench (M2)
included and remov
★ Lors du réglage des boutons n – s , déposer les deux vis à six pans à l'aide de la clé à vis hexagonale
(M2) fournie et déposer le couvercle.
★ Cuando ajuste los botones n – s , retire los dos tornillos hexagonales utilizando la llave hexagonal
(M2) proporcionada y quite la cubierta.
