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1) Label the fi rst amplifi er as the Positive amp. Then set the phase switch on this amp to the 0 degree setting.
Now label the second amplifi er as the Negative and set the phase switch on that amplifi er to the 180 degree
setting.
2) The interconnects coming from the source unit need to be split into each of these two amplifi ers. Using a “Y”
connector, split the “Left” side of the interconnect from the source so that it can go into the “Left” RCA input
receptacles on each amplifi er. Using another “Y” connector, split the “Right” side of the interconnect into the
“Right” RCA input receptacles on the amplifi ers in the same way.
3) Only the positive speaker terminals on each amplifi er will be used as the connection points for the speaker.
Connect the positive side of the speaker wire to the positive terminal of the amplifi er labeled Positive.
Connect the negative side of the speaker wire to the positive terminal of the amplifi er labeled Negative. Make
sure that the impedance of the subwoofer is no lower than a 4 ohm load. This is important in order to avoid
possible damage to the amplifi er.
Running two amplifi ers strapped will require “gain matching.” This will require source material that includes test
tones and a volt ohm/multi meter. Please see “Adjusting Individual Gain Controls”
Note: Please pay attention and make sure the speakers or woofers are the correct IMPEDANCE (OHMS) BEFORE
attaching to the amplifi er.
3. Power Terminals – Please take proper measures during installation to protect the power wires as best you
can. For example, when running the power cable from the vehicle’s battery through the fi rewall, use a fi rewall
bushing for protection. Run the power wire through the interior of the vehicle, under the carpet, and to the
amplifi er. If this is something that you do not feel comfortable doing, please ask a professional to help you. Be
sure to lay the power wire away from all signal cables.
When connecting the power wires to the amplifi er please observe the printed markings on the amplifi er’s
StreetWires power connector. Failing to wire the power cables properly could result in amplifi er damage.
• +12V: This is the main power input for the amplifi er and must be connected directly to the positive terminal
of the car battery for the amplifi er to operate properly. It is important that a main fuse is installed a maximum
of 18” from the battery.
• GND: This is the ground connection for the amplifi er and must be connected directly to the metal chassis
of the vehicle for the amplifi er to operate properly. A properly grounded amplifi er can be run harder and
longer than a poorly grounded amplifi er. The ground on the amplifi er should be as short as possible and
be connected directly to the vehicle’s metal chassis. Do not connect to factory bolts of ANY kind. When
attaching the ground to the chassis, sand all the paint away from the contact point. A grounding block like the
StreetWires GT0 should be used whenever possible as this piece of equipment has 5 times the surface area of
a normal screw.
The gauge of the power and ground wire is often an overlooked aspect of amplifi er installation. The more power
the amplifi er receives, the more power it will produce. Power cables have a natural resistance, and will lose
voltage by the time the power makes its way to the amplifi er. The larger gauge (diameter) wire will hold more
voltage over longer runs. Also, by having a larger diameter ground wire, the amplifi er can run more effi ciently.
MTX recommends using a minimum of 1/0 gauge power and ground cables to get the best performance.
• REM: This connection turns the amplifi er on and off and needs to be connected to a remote turn-on wire
from your source unit if you are using a low level input connection.
Note: When numerous amplifi ers are used in the same system, look into using a relay with a separate power wire
connected to an alternative power source to take the strain off the source unit. Normal source units can only
keep a constant 12 volts to 2 or possibly 3 amps. This wire should also be run away from the RCA cables.
• CAP+: This 4 gauge terminal is internally wired in parallel with the +12V on the StreetWires Power connector.
It is the ideal connection point for the positive side of a capacitor to increase the amplifi er’s performance.
• CAP-: This 4 gauge terminal is internally wired in parallel with the GND on the StreetWires Power connector.
It is the ideal connection point for the negative side of the capacitor to increase the amplifi er’s performance.