It is the ideal connection point for the positive side of a capacitor to increase the amplifi er’s performance.
• CAP-: This 8 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.
Double check all the previous connection installation steps, in particular the speaker and power wiring. Securely
mount the amplifi er. If everything is in order, reconnect the vehicle’s negative battery connection and begin
following the feature setup and adjustment steps.
Feature Setup and Adjustments
1. Selecting the Input Sensitivity Range – Before you turn on your system, you must select the proper input
sensitivity range on your amp using the button labeled INPUT SENS located in the GAIN CONTROL section of
• Setting for Aftermarket Source Units: Refer to your aftermarket owner’s manual for line level output
specifi cation. If the specifi cation is not available, please follow the instructions listed below.
X1 POSITION: 100mV–1V (Typically for RCA Input)
• Setting for Factory (OEM) Source Units: To check the amount of voltage that is present from the source
unit, take a multi meter, or a volt/ohm meter, on the AC setting, (range from 100mV up to 10 volts) attach the
positive and negative leads directly to any exposed speaker. It will not matter if the polarity is correct, it will
read the same amount of voltage.
X10 POSITION: 1V–10V (Typically for Speaker Level Input)
Note: It is important not to have the amp set up to receive a low voltage signal and give it a high voltage signal.
Doing this can cause damage to the amp.
2. Adjusting the Gain Control – Before you start setting your amp gains, be sure to defeat all EQs (“off”
position). You want to set the gain levels properly BEFORE applying any equalization.
Start with the source unit’s volume around ¾ of the way up, and the gain on the amp all the way down (counter-
clockwise). Slowly increase the gain clockwise until the speaker starts to distort. Immediately decrease gain
until the distortion goes away. This will be a good reference point on the volume control to where the signal
starts to distort. Remember every CD will be different; use common sense and constantly listen for obvious
distortion and adjust volume accordingly. The gain on the amp has nothing to do with how much power the
amp can produce, just how fast the amp puts out max power. Just like in an automobile, full throttle is very
3. Adjusting the Low, 24dB @ 40Hz - 200Hz Variable Low Pass X-over Frequency Controls–
• Setting for Subwoofers: Using “L-PASS CROSSOVER” you have control over what frequency you want your
amp to start crossing over your signal. By turning this control all the way counter-clockwise you are crossing
the signal over at 40Hz (the range is counter-clockwise 40Hz to clockwise 200Hz) This means that the amp will
send the woofers the frequencies from 20Hz to 40Hz and then start to taper down as the frequencies go over
40Hz (24dB/octave roll off). The industry standard for low pass crossover point is right around 90Hz. However,
by experimenting with the crossover point (higher or lower) you will fi nd what sounds best in this install. The
decibel per octave roll off (dB/oct) means how fast the amplifi er tapers down as the frequencies get higher.
This amp uses a 24 decibel per octave roll off, which is pretty steep, or tapers off fairly quickly from the
crossover point. This design complements both the subwoofer and the mid to provide greater musical detail.
4. Setting the 30Hz, 12dB Fixed Subsonic Filter – First enable the Subsonic Filter by selecting the “ON” position
of the SUBSONIC FILTER switch. This feature will help remove some of the potentially damaging low
frequencies of 30Hz and below from your subwoofer system. Use this feature if the subwoofer breaks up at
5. Adjusting the Quasi Parametric Equalizer – In some applications the bass amplifi er needs some help in
boosting or cutting certain frequencies. A quasi parametric equalizer is distinguished from a parametric
equalizer in that it allows the user to control only the level and the center frequency of the boost or cut but not
The following steps describe what each of the two controls of the parametric bass EQ do in isolation. It is
important to understand these behaviors, because they must all be considered when setting up the bass EQ.
• Setting the Frequency: Begin listening for the loudest musical spot or range within the bass range of your
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