ZRS C8 CONTROLS
Band Pass Configuration.
The ZRS C8 features a unique band pass system where by channels 1 and 2 can be configured high pass or full range while separately setting channels 3 and 4 to their own band pass frequencies. This band pass system is especially useful when installing multiple midrange and tweeter speakers. Please see below for detailed instructions.
Set Channels 1 and 2 Crossover Switch to HPF (High Pass Filter) and adjust the HPF (High Pass Filter) knob to the frequency you wish to choose to block low frequency signals. In the drawing below we set the knob to approximately 40Hz. Now channels 1 and 2 will only play signals above 40Hz. You can also choose to set Channels 1 and 2 to Full Range by changing the switch position to FULL.
Set Channels 3 and 4 Crossover Switch to BP (Band Pass) and adjust the HPF (High Pass Filter) knob to the frequency you wish to choose to block low frequency signals. In the drawing below we set the knob to approximately 80Hz. Set the LPF (Low Pass Filter) to the frequency you wish to choose to block high frequency signals, we chose 150Hz. Now channels 3 and 4 will only play signals between 80Hz and 150Hz.
The Band Pass Setting is especially useful when setting up component speakers where you want to activly block low frequencies from reaching your midrange speakers and tweeters and for multiple midrange speaker installations. When installing a
Midrange | Midrange | Midrange | Midrange |
DASH MOUNT
BASS REMOTE
Channel 5 is the mono subwoofer channel and comes equipped with a
d a s h b o a r d v o l u m e
remote control which can be installed near the dash for your convenience in 
controlling the subwoofer.
INPUT
GAIN CONTROL
The ZRS C8 amplifies features advanced input gain control from 0.2 volts to 6 volts so that it can operate efficiently and at full power from any head unit pre amp signal.
HEAVY DUTY
HEATSINK
Super
guarantees that your amplifier
will stay cool no matter how
h a r d y o u p o u n d i t .
C o m p u t e r i z e d t h e r m a l protection circuitry guarantees 
the amplifiers stability.
POWER & DIAGNOSTIC
LED INDICATORS
ZRS amplifiers feature s o p h i s t i c a t e d I C controlled protection circuitry. If the amp goes i n t o a d i a g n o s t i c condition from thermal over load or speaker short circuit the LED will light and amp will shut down.
RCA PREAMP
INPUT MODE SELECTOR
If you have 1 pair of RCA jacks, input them in to 1CH and 2CH then set the switch to
2CH. If you have 2 pairs of RCA jacks, input them in to CH, 1,2,3 and 4 then set switch to 4CH. If you
have a subwoofer R C A f r o m y o u r headunit, it should go to 5CH.
24dB LOW PASS
CROSSOVER SLOPE
Channel 5 electronic crossover features sophisticated
CONNECTION
TERMINALS
The ZRS C8 features heavy duty bolt down terminals, the power and ground terminals accept 4 gauge wire while the speaker terminals can accept 10 gauge wire.
Before you begin with your installation, disconnect the NEGATIVE
It is recommend that you layout your sound system design on paper first. This will help you during the installation so that you will have a wiring flow chart and not
Mount the amplifier in the trunk or hatch area of your vehicle. Never install an amplifier in the engine compartment or on the firewall. Please be sure to leave breathing room around the amplifier heat sink so that it can dissipate the heat it produces efficiently. The amplifier can be installed either horizontally or vertically.
When mounting the amplifier on the trunk floor, be sure to watch for your gas tank, gas lines and electrical lines. Do not drill or mount any screws where they might penetrate the gas tank of your car.
Once the system is operational, the first thing to do, is set all crossover points to approximate settings. In the case of the basic sub woofer system Low Pass filter crossover at 100 Hz or so. Set the Bass Boost equalizer controls to 0 dB ( Flat Switch Position.)
Now you should set the amplifiers Input Sensitivity adjustment. The knob accessible on the side of the amplifier marked INPUT GAIN adjusts the input sensitivity from 300mV to 7Volts.
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 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
Once you are satisfied with the level control settings, use any 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 amplifiers 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.
If your unit has been professionally installed please do not change the gain settings set by the installer, he is the professional!
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.
