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POWER CONNECTIONS
Note:
your amplifier can
on/y
be operated from a
1%
volf
NegativeGroundefecfricatsysfem.
Ifyourcarwasproduced
before
1970.
orifyouhaveanydoubts.
mahesureofthe type
Of electrical system you have before making any
connectfons.
The MC.300 will draw up to 45 amperes if used to its fullest
capacity~
Determine the alternator rating of your car and the
Current consumption ofthe car’s other accessories. It may be
necessary to upgrade the alternator or to install a separate
battery and battery isolator.
For power wiring. use Soundstream power cable or an
equivalent premium cable. The PLUS 12Vterminal[(3) in the
wiring diagram] should be connected directly to the positive
(+)
terminal of your car battery. Install two (2) 20 amp fuses
iin
parallel) in the line close to the battery terminal. If you
have more than one amplifier, each amplifier should be
separately fused.
The GROUND terminal (2) should be connected directly to
the automobile chassis with 8 gauge wire. Make this wire as
short as possible to prevent noise in the system A nearby
bolt can serve as a ground terminal. Make sure that the wire
contacts bare metal, not coated metal
or
paint. It is important
that the ground connection you select have minimal noise
resistance to the battery ground post (a maximum of 0.1
ohm)~
REMOTE POWER-ON CONNECTION
If your tuner/deck has a remote power,on control wire,
connect it to the REMOTE terminal (1) on your amplifier. This
isacontrol line. notapowerline.
sosmallwire
(1820gauge)
is acceptable.
If your tuner/deck has no remote power-on control labeled as
such, but has a power antenna control, it may be possible to
wire the power antenna control to the REMOTE terminal.
If your tuner/deck has neither
a
remote power-on control wire
nor a usable power antenna control; it will be necessary
either to connect the REMOTE terminal to a
+12
volt source
which is switched by the ignition key. or to connect the
REMOTE terminal to a constant
+12
volt source through an
on/off switch you install in series with the ignition switch in a
location accessible to the driver. Note:
/fan
outboardswitch
is used. make sure it is switched off when you leave the
vehicle or when the sound system is not in use.
POWERING UP THE SYSTEM
Once
the installation is complete, turn on the system. Both
LED indicators on the MC.300 should now be lit. If they did
not light up, turn thesystem off immediately. Proof wiring and
check for shorts or poor connections.
If wiring is okay, check the relay or fuse in the power line. If
blown, replace it with another identical fuse.
If one LED indicator is out, check the internal fuses located
behrnd
the bottom cover of the
amp.Also
check the interior
_
power supply
fuses~
If any of those are blown replace with
the same value fuse.
INPUT LEVEL ADJUSTMENT
Input levels are adjusted by means of four independent
controls that are accessible through the heat sink directly
above the input connectors. The controlscan be turned with
a small.
flat~head
screwdriver.
In four channel mode. the left and right halves of CHANNEL
A are set by controls (13) and (14) respectively; the left and
right halves of CHANNEL Bare set by controls (24) and (25).
In twochannel mode,
onlythe”right”control(l4)
rsoperatfve
for CHANNEL A, and only (25) for CHANNEL B.
In three channel mode, use only the “right” control for
whichever of main CHANNEL A or CHANNEL B is operating
In
mono, and both controls for the other main channel.
Depending on how you are using your MC.300 (number of
channels, biamplification. associated equipment, etc.),
dif-
ferent factors may apply for optimum gain settings. In gen-
eral, begin by turning all level controls to minimum (full
counter-clockwise). Turn the system on, and set the volume
control on your tuner/deck at its mid-point. Advance
therq
amplifier input level controls until you have reached a com-
fortable listening level and both channels are in balance.
No&
with many tuneridecks, the radio output level is
signifi~
cant/y different than the tape output /eve/. Check both
sources. and set /eve/s using the lesser of the outputs
(usuatty
the tape).
LINEAR SUBWOOFER EXTENSION (LSE)
The LSE circuit will compensate for the natural
rolloff
of most
loudspeakers, and can extend deep bass as much as one full
octave. ForCHANNELA.
LSEisengagedbypressingswitch
(9). and the frequency is adjusted by control (8). For
CHAN-
NEL B, LSE is engaged by pressing switch
(20),
and the
frequency is adjusted by control (19). If either CHANNEL A
or CHANNEL B is operating in stereo, LSE will be applied to
both left and right.
The control allows for continuously variable adjustment,
over the range from 35 Hz to 280
Hz;
of the frequency at
which LSE beginsits boost. Below thechosenfrequency. the
boost is applied at 6 dB per octave. When properly adjusted,
LSE will “linearize” the low end of the woofer(s) and provide
remarkably smooth and deep bass. A word of caution: small
or inexpensively constructed woofers may be unable
to-
handle the equalization which results from setting the LSE to
above 100 Hz.
_