Installation guide
SPEAKER
1 Ω MINIMUM
REM
POWER
7 8
ADJUSTING THE SYSTEM
Once the system is operational, the rst thing to do, is set all crossover points to approximate
settings. In the case of the basic sub woofer system Low Pass lter crossover at 100 Hz or
so. Set the Bass Boost equalizer controls to 0 dB ( Flat Switch Position.)
Now you should set the ampliers Input Sensitivity adjustment. The knob accessible on the
side of the amplier marked INPUT GAIN adjusts the input sensitivity from 150mV to 8 Volts.
To adjust the input sensitivity, turn the control using a small at 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 amplier 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 multi-amp system, set each amplier’s gain separately. Start off with the
bass amplier, then adjust the highs amplier’s level control to match.
Once you are satised 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 ampliers level controls.
*** 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 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 rst setting up the system.
USING THE ELECTRONIC CROSSOVER - 4 CHANNEL MODEL (D100.4)
The four channel model features separate crossovers for channels 1-2 and 3-4.
All the ZRS Smart Series ampliers 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 sub woofers.
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 40Hz
to 150Hz. A frequent mistake made is setting the low pass frequency too low,
especially when using vented sub woofer 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 ampliers for component speakers or coaxial, you will want to
set the CROSSOVER MODE switch to HIGH PASS. The FREQUENCY control
knob adjusts the high pass frequencies between 50Hz and 500Hz. Do not attach
tweeters directly to the amplier even in the high pass mode without a secondary
passive crossover to protect them. 500Hz high pass is not a frequency high
enough for tweeters.
PASSIVE SUBSONIC FILTERING
For sub woofer installations with a passive LP crossover, you can set the amplier’s
CROSSOVER MODE selector to HIGH PASS while setting the FREQUENCY
KNOB to 40Hz, this will act as SUBSONIC FILTER for all signals below 40Hz. This
is especially useful for vented enclosures where the port tuning frequency falls
below the sub woofer tuning frequency to protect against sub woofer unloading.
MOUNTING THE AMPLIFIERS:
Choose a convenient mounting location with unobstructed airow.
The ZRS Smart ampliers feature four mounting tabs located near the ampliers four
corners. Using the supplied screws and grommets, gently mount the amplier into
position.
*** Do not over tighten the screws.***
The ZRS Smart Series ampliers are supplied with built-in fuses, never replace the fuse that
the amp came with, with one of a larger value.
We suggest you construct a Red wiring harness with 2 additional fuses. One fuse should
be located near the car battery. This fuse near the battery offers protection against damage
from short circuits to the car chassis between the battery and the amplier. A second fuse
closer to the amplier offers additional safety to the amplier itself. This fused red power
wire should be attached to the amplier power terminal marked 12V+.
The wire harness should be made of red primary cable of at least 4 gauge for all ZRS
Smart Series ampliers. The harness should terminate in a large ring terminal for connection
directly to the positive terminal of the car battery. Use a spade plug to attach the wire, which
connects to the amplier location marked 12V+.
A second black color wire of equal gauge should be used as a ground connection to a
welded chassis member. When connecting the ground wire make sure that there is no paint
or other insulator blocking a good ground connection. When installing multiple ampliers,
mount them in close proximity so that they can all share the same ground point. Attach the
black ground wire to the amplier screw terminal marked Ground.
We recommend that you use the Cadence AMPKIT4 or AMPKIT8 amplier installation kits,
which contains all the cabling and accessories necessary for a good, reliable installation.
INSTALLATION
MOUNTING AND WIRING
BATTERY
FUSE
GROUND
REMOTE
TURN ON
Terminal of
head unit