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6
Settings
Adjusting the System
1. Once the system is operational, set all crossover points to the approximate settings. In the case of a basic subwoofer system, set the Low Pass Filter (LPF) crossover at 100Hz or so.
Set the Bass EQ to 0dB. Turn the controls using a small athead screwdriver. Do not apply any pressure while turning as this might break the control unit.
2. Set the amplier’s Input Sensitivity using the control accessible on the side of the amplier marked INPUT LEVEL (gain). Turn it counterclockwise to the MIN position. Adjust your head
unit’s volume gain to the maximum it can go before signal distorts or to the loudest gain, which is usually about 75% – 85% on most head units (you can also use an oscilloscope to see at
what gain level your head unit distorts). When you begin to hear distortion, back down one notch. Now turn the INPUT LEVEL control on the amp clockwise until you hear distortion, then
turn it counterclockwise by a notch or until the distortion is gone. The amp’s input sensitivity is now set. It is helpful to have a second person to help you set the gain. When setting up a
multi-amp system, set each amplier’s level controls separately. Start off with the bass amplier, then adjust the highs amplier’s level control to match. Please note that the level control
of any car amplier should not be mistaken for a volume control. It is a sophisticated device designed to match the output level of your source unit to the input level of the amplier. Do not
adjust the amplier level to maximum unless your input level requires it. Your system can also be extremely sensitive to noise when the input level is set to maximum and does not match
your input signal. These adjustments need to be made only once when rst setting up the system.
3. Once you are satised with the level control settings, use any equalizer controls to adjust the system’s tonal level for personal preference. Keep in mind that after equalizing you may
have to go back and reset the amplier’s level controls.
If your unit has been professionally installed, please do not change the gain settings set by the installer. He is the professional!
Audio Preamp Input
This amplier features RCA preamp inputs. Run RCA cables from your sound source to the amplier’s inputs. We suggest you use high-quality, shielded RCA patch cords to help reduce and
eliminate unwanted electrical noise to your system. Use good quality RCA interconnect cables. Cheaper cables usually have poor shielding that can cause interference pickup.
Be sure to run the RCA cables on the side of the vehicle opposite to the side used to carry the power and ground leads of the amplier.
Using the Built-In Low Pass Electronic Crossover
dB Series Mono Block ampliers feature a 12dB per octave fully adjustable crossover with differential circuitry.
The knob marked LOW PASS will control the low-pass frequencies from 50Hz – 250Hz. A frequent error made is setting the low-pass frequency too low, especially when using vented
subwoofer enclosures. We recommend that for most installations you set the frequency knob between 80Hz – 150Hz depending on your preference and the rest of your audio system.
Using the Subsonic High Pass Filter
Subsonic frequencies are very low and can cause damage to your subwoofers. The Subsonic High Pass Filter will allow you to attenuate any frequencies below the set limit.
Using the Phase Shift
The Phase Shift control synchronizes the phase of your subwoofer output to that of the other speakers in the vehicle. It can be set anywhere between 0 to 180 degrees. Set the amp to
0 and listen to a track with some bass. Now set the control to 180 degrees, listen to the same track, and see if the bass output improves or becomes worse. Adjust the switch until you
achieve the best results.
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