Soundstream Technologies Stereo Amplifier MC 300 User Manual

THREE HUNDRED  
MULTIPLE-CHANNEL  
AMPLIFIER  
Owner’s Manual  
 
MC  
Amplifier Owner’s Manual  
ever require service or replacement, recording the  
below for your own records will help protect your  
Investment:  
own one of the finest power amplifiers available, a precision  
component capable of  
performance.  
Model Number  
Serial  
To get the most out of your MC-300. we suggest you  
Please  
retain this manual for future reference.  
Soundstream products are the result of American crafts-  
and the highest quality control standards; your  
MC-300 should deliver many years of pleasure. Should it  
Dealer’s Name  
Date of Purchase  
CONTENTS  
..................................  
Wiring Diagram  
Features  
Design  
..........................................  
Installation  
Mode.. ................  
Selecting Operating  
...  
.
Optimizing For Speaker Impedance.  
..............................  
...........................  
............................  
Input Connections  
Output Connections  
Power Connections  
Remote Power-on Connection  
Up the System ....................  
Powering  
Level Adjustment..  
Linear Subwoofer Extension  
..............................  
.....................  
..............  
Protection Circuits  
...............................................  
Service  
...  
..................... ...... ....  
Specifications  
 
Figure  
1
Z-Channel Operation  
Figure 2 3 Channel Operation  
Figure 3  
Operation  
 
DESIGN FEATURES  
INSTALLATION  
The MC-300 isconservatively rated at 300 watts  
This power can be divided into four channels (4x75 watts),  
Proper installation and adjustment will reward you with  
reliable operation and optimum performance. Automotive_  
sound system installations can be tricky. especially for  
timers. For this reason, you may want to consider using a  
professional installer who has the tools and, more impor-  
tantly, the experience, to do the right job. If you decide to  
install your equipment yourself, we hope that this manual will  
serve as a helpful  
three channels (2x75 watts.  
two channels (2x150  
watts). The design topology utilizes multiple Darlington out-  
put devices with a total capability of 1200 watts. With such re-  
serves and no current limiting,  
MC-300 operates without  
strain even at maximum output. Power, ground, and speaker  
are rated to handle up to 60 amps and up to 8  
gauge  
LOCATION AND MOUNTING  
To provide lull circuit protection necessary for an amplifier  
thispowerful,  
The first step in  
is thorough planning. Choose the  
location for your amplifier carefully. The amplifier should be  
located in either the passenger compartment or the trunk,  
never in the engine compartment or in any outside location  
exposed to din and moisture. Adequate ventilation is impor-  
tant. allow enough space so that air can circulate around the  
heat sinks.  
power supply that works silently and effectively to prevent  
without the need for a fan. Should the  
begin to overheat, the power supply slightly reduces output  
power, which allows the unit to run  
cooler. Once the  
amplifier returns to normal operating temperature. full output  
capacity is then restored. The entire process is automatic  
and inaudible. In the case of an amplifier malfunction,  
Make sure that the installed amplifier will not interfere  
normal operation of the car. It is best not to locate the  
near your vehicle antenna, since the  
secondary thermostats  
conventional To prevent potentially damaging  
on or turn-off thumps. a pair of relays at the outputs allow the  
shut down the  
in a  
powersupplycan interfere with AM reception. Your amplifier  
amplifier to fully stabilize before sending  
the loudspeakers.  
audio signal to  
should be mounted  
to your car’s sheet  
with the  
four provided. USC your amplifier as a template for  
making pencil marks where you intend to drill. (Make sure  
thatthelocationyouareplanning todrillthroughisfreeofany  
obstacles such as wiring or gas tanks.)  
An especially useful feature of the MC-300 IS  
woofer Extension (LSE). which compensates  
natural  
of most speakers and extends bass as much as one  
full octave. LSE provides a linear boost of 6  
starting at a point which is continuously variable over the  
It’s a good  
thecomponents. If you have a  
connect and test all components outside the car. Or, you can  
connecttheminsidethevehiclepriortofinal Either  
to bench test your system before mounting*  
you can  
range  
Hz. A subsonic filter attenuates the signal  
below 20 Hz.  
way, connect the components exactly as you intend to in the  
final installation; make all power connections last; test the  
system; then disconnect all power until the final installation  
is complete.  
parts are used the  
such as metal  
film resistors, gold-plated input connectors, and immersible  
sealed potentiometers. The case is equipped with generous  
heat sinks. Input sensitivity is adjustable to match any tuner!  
deck, the MC-300 can even be interfaced with OEM speaker  
level signals.  
WIRING  
Determine how your vehicle’s wiring is laid out. Keep all  
wiring inside the car. Good standard audio practice suggests  
keeping signal wires short and away from wires carrying  
power. Wires can be run under carpet. If you drill a new  
passage hole through metal, make sure that all burrs have  
been filed away to prevent scraping; use grommets where  
needed. All wires should be hidden: an exposed wire can  
inadvertently be pulled, causing disconnection or shorting.  
Wires should never be under tension or subject to moisture.  
Use cable ties to bundle excess wire.  
 
POWER CONNECTIONS  
your amplifier can  
be  
from a  
If one LED indicator is out, check the internal fuses located  
the bottom cover of the check the interior  
If any of those are blown replace with  
power supply  
before  
mahesureofthe type  
Of electrical system you have before making any  
the same value fuse.  
The MC.300 will draw up to 45 amperes if used to its fullest  
Determine the alternator rating of your car and the  
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  
Current consumption  
car’s other accessories. It may be  
necessary to upgrade the alternator or to install a separate  
battery and battery isolator.  
a small.  
screwdriver.  
For power wiring. use Soundstream power cable or an  
equivalent premium cable. The PLUS  
in the  
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).  
wiring diagram] should be connected directly to the positive  
terminal of your car battery. Install two (2) 20 amp fuses  
parallel) in the line close to the battery terminal. If you  
have more than one amplifier, each amplifier should be  
separately fused.  
In twochannel mode,  
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  
mono, and both controls for the other main channel.  
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 paint. It is important  
that the ground connection you select have minimal noise  
resistance to the battery ground post (a maximum of 0.1  
Depending on how you are using your MC.300 (number of  
channels, biamplification. associated equipment, etc.),  
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  
amplifier input level controls until you have reached a com-  
fortable listening level and both channels are in balance.  
REMOTE POWER-ON CONNECTION  
with many  
the  
output level is  
If your tuner/deck has a remote  
control wire,  
cant/y different than the tape output /eve/. Check both  
sources. and set /eve/s using the lesser of the outputs  
the tape).  
connect it to the REMOTE terminal (1) on your amplifier. This  
isacontrol line. notapowerline.  
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.  
LINEAR SUBWOOFER EXTENSION (LSE)  
The LSE circuit will compensate for the natural  
loudspeakers, and can extend deep bass as much as one full  
octave.  
(9). and the frequency is adjusted by control (8). For  
NEL B, LSE is engaged by pressing switch  
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.  
of most  
If your tuner/deck has neither  
nor a usable power antenna control; it will be necessary  
either to connect the REMOTE terminal to a volt source  
which is switched by the ignition key. or to connect the  
REMOTE terminal to a constant volt source through an  
switch you install in series with the ignition switch in a  
location accessible to the driver. Note:  
used. make sure it is switched off when you leave the  
vehicle or when the sound system is not in use.  
a
remote power-on control wire  
and the  
The control allows for continuously variable adjustment,  
over the range from 35 Hz to 280  
which LSE beginsits boost. Below thechosenfrequency. the  
boost is applied at 6 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  
handle the equalization which results from setting the LSE to  
above 100 Hz.  
of the frequency at  
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.  
 
SPECIFICATIONS  
PROTECTION CIRCUITS  
Power output:  
Your amplifier is protected against both overheating and  
short circuits. Because of the “soft’ thermal protection (see  
150 watts continuous per channel  
the Design Features section on page  
it is highly unlikely  
2 into 4 or ohms, 20 Hz 20  
that the amplifier will shut off because of thermal overload.  
150 watts continuous mono  
into 4 or ohms, 20 Hz 20  
If your amplifier shuts down, turn off the system, wait for a  
few moments, and turn the system on again.  
75 watts continuous per channel  
2 into 2 or 4 ohms, 20 Hz 20  
continuous per channel  
4 into 2 or 4 ohms, 20 Hz 20  
SERVICE  
Your Soundstream amplifier is protected by a limited war-  
ranty. Please read the warranty enclosed with the product.  
Total Harmonic Distortion  
20 Hz 20  
at full rated power  
into 2, 4 or ohms  
Signal-to-Noise Ratio  
Damping Factor  
IHF Dynamic Headroom 3  
Maximum Current Draw 45 amps  
Idle  
Current  
Draw  
2.5  
250  
amps  
Input  
Sensitivity  
2.5  
V
continuously variable  
L
S
E
infinitely variable  
Dimensions . . . . . . . . . . . . . . . . . . ...14-l/5” W  
H
10” D  
with bottom plate  
W
H
D
heat sink  
 

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