8
N o i s e c h e c k a n d s y s t e m a d j u s t m e n t
NOISE CHECK
Check the entire audio system for noise before permanently securing the Line Driver mounting
1. Start the engine.
2. Turn the audio system on.
3. Rev the engine and vary the VOLUME of the audio system to determine if there is any unwanted noise.
If so, turn both the audio system and the engine off. Do not secure the Line Driver mounting screws. Refer to the "Trouble Shooting Guide" at this manual.
4. If the audio system does not have any noise, securely tighten the Line Driver mounting screw and double check the wiring cabl
es for safe placement.
SYSTEM ADJUSTMENT
Preliminary Adjustments
Pre-setting the system provides a necessary starting point for fine-tuning the entire audio system to maximum performance.
NOTE: DO NOT MOUNT Line Driver UNTIL THE FOLLOWING PROCEDURES HAVE BEEN COMPLETED.
1. Preset each amplifier input gain adjustment at the amplifier to half of maximum.
2. Slowly turn the volume up and listen carefully for: obvious trouble in sound (distortion, no sound, no hiss, total silence). Turn the system off refer to "Trouble Shooting
Guide" at this manual.
Caution
DO NOT ROUTE AUDIO CABLES AND POWER CABLES TOGETHER! THIS CAN CAUSE ENGINE NOISE IN YOUR AUDIO SYSTEM. ALWAYS DISCONNECT
THE SYSTEM FROM THE BATTERY BEFORE ATTEMPTING TO MAKE OR ALTER ANY CONNECTIONS. THIS PRODUCT IS DESIRED FOR USE IN ANY
12 VOLTS NEGATIVE GROUND ELECTRICAL SYSTEM ONLY. INSTALLING THIS PRODUCT IN ANY POSITIVE GROUND ELECTRICAL SYSTEM COULD
SERIOUSLY DAMAGE THE AUDIO SYSTEM.
Adjusting The Line Driver
The Line Driver provides variable enhancement of Line frequencies. The level of peak boost varies from 0 to +18dB and the frequency at which peak boost occurs is adjustable
from 40Hz to 400Hz. 20-Q to 2-Q boost characteristic can be adjustable.
2-Q characteristic boosts a wide range of frequencies and is useful for general sound quality enhancement. The 20-Q characteristic boosts a narrow range of frequencies
and can be used to tune a subwoofer system fo rmaximum output.
The Line Driver Q adjustable should be set to the 2-Q(wide) position and the frequency control set approximately one octave below the subwoofer's resonant frequency.
In vented enclosures, the roll off of the system is quite steep below the tuning frequency (typically 24dB/octave). In this case, the Line driver should be set for 20-Q(narrow)
operation. Never set the Line Driver boost frequency below a vented enclosuer's turning frequency. For maximum output from a vented enclosure, set the Line Driver boost
frequency to the tuning frequency of the enclosure. These adjustments can be made with the Line Driver in the signal path, but make sure the effect is turned off (remote
level Min.) then verify operation of the Line Driver by increasing the boost level while listening for changes in subwoofer response.
Once operation of the Line Driver is confirmed, adjustment can proceed.
