7
Settings
Adjusting The System
1. Once the system is operational, set all crossover points to approximate settings. In the case of a basic sub woofer system, set the Low Pass Filter (LPF) crossover at 100Hz or so. Set
the Bass EQ to 0 dB. Turn the controls using a small at head screwdriver. Do not apply any pressure while turning as this might break the control unit.
2. Now set the amplier’s Input Sensitivity. The control accessible on the side of the amplier marked LEVEL (gain) adjusts the input sensitivity. 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 your head unit distorts). When you begin to hear distortion in the sound, back down one notch. Now turn the LEVEL control on the amp clockwise until
you hear distortion. Turn the LEVEL control 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 vessel 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 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 pre amp 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 vesselry the power and ground leads of the amplier.
Using The Built-In Electronic Crossover
Each set of channels (1 – 4 & 5 – 8) has its own fully adjustable 12dB per octave crossover with differential circuitry. This the ATOM 8 ideal for subwoofers (sealed and vented), full range
speakers, midrange speakers, and even tweeters.
Set the amp to high pass mode (HPF) to lter out the lower frequencies (cut-off frequency adjustable between 50Hz – 250Hz). Set the crossover to low pass (LPF) to lter out the upper
frequencies (cut-off frequency adjustable between 50Hz – 250 Hz). In full mode (FULL) you will not be ltering any frequencies. For example, set the Channel 1 & 3/2 & 4 crossover to FULL
for 4 full range speakers and set the Channel 5 & 7/6 & 8 crossover LPF for subwoofers.
