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Once the system is operational, the first thing to do, is set all crossover points to approximate
settings. In the case of the basic subwoofer system Low Pass filter crossover at 100 Hz or so.
Set the Bass Boost equalizer controls to 0 dB
Now you should set the amplifiers LEVEL adjustment. The knob accessible on the top of the
amplifier marked Input Level adjusts the input sensitivity from 150mV to 5Volts.
To adjust the input sensitivity, turn the control using a small flat head screwdriver fully counter
clock wise to the minimum position. Do not apply any pressure while turning as this might
break the control unit. Adjust your radio volume level to maximum volume. Now turn the level
control on the amplifier clockwise towards the Maximum marking and until audible distortion
occurs. When you begin to hear any distortion in the sound, back down one notch and your
amp is set. It is helpful to have a second person to help you set the gain.
When setting up a multi-amp system, set each amplifier’s gain separately. Start off with the
bass amplifier, then adjust the highs amplifier’s level control to match.
Once you are satisfied with the level control settings, use the equalizer controls to adjust the
system tonal level for personal preference. Keep in mind that after equalizing, you may have
to go back and reset the level controls.
The level control of any car amplifier 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 amplifier. Do not adjust the amplifier gain 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. The gain adjustments need to be made only once when first
setting up the system.
If your unit has been professionally installed please do not change the gain settings set by the
installer, he is the professional!
Channel 3/4Channel 3/4
USING THE ELECTRONIC CROSSOVER - 4 CHANNEL MODEL
The four channel models feature separate crossovers for channels 1-2 and 3-4. All the Q
Series amplifiers feature 12dB per octave fully adjustable low-pass and high pass electronic
crossovers.
FOUR CHANNEL AMPLIFIER CONFIGURATIONS.
1. All four channels High Pass for internal component speakers in doors and rear decks.
2. Channels 1 and 2 High Pass for front component speakers, while channels 3 and 4 are
wired to subwoofers.
3. Bridge channels 1 and 2 for single high power subwoofer channel. Bridge channels 3 and 4
for second high power subwoofer channel.
For Low Pass systems, set the crossover mode switch to LOW PASS. Now the knob marked
FREQUENCY will control the low pass frequencies from 50Hz to 250Hz. A frequent mistake
made is setting the low pass frequency too low, especially when using vented subwoofer
enclosures. We recommend that for most installations you do not set the frequency knob
lower than 100Hz (the 12 o’clock position).
When using the amplifiers for component speakers or coaxial, you will want to set the mode
switch to HI PASS. The FREQUENCY control knob adjusts the high pass frequencies
between 50Hz and 250Hz. Do not attach tweeters directly to these amplifiers, even in the high
pass mode without a secondary passive crossover to protect them. 250Hz high pass is not a
frequency high enough for tweeters.