Precision Acoustics PA602, PA604, PA500D Instruction Manual
AMPLIFIERS
AMPLIFICATEURS
PA602
PA604
PA500D
INSTRUCTION MANUAL
LIVERT D’INSTRUCTIONS
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Overview
Introduction
Precision Acoustics would like to introduce our small footprint and big
power car audio amplifier product line. Keeping performance and
budget in mind, our engineers have delivered on maximum wattage for
minimum dollar! And knowing that showing off your gear is as important as being heard down the street, we were sure to pay equal attention on style and functionality. After all, we want you to have the ultimate car audio system. Precision Acoustics would like to thank you for
CAUTION
purchasing its products.
This device is a high power, audio
amplifier. Proper and careful usage
of this product will provide many
years of enjoyment. Being exposed
to very loud music can result in
temporary or permanent hearing
loss. Misuse or improper installation will shorten the life of your
product, and/or result in damage to
the vehicle electrical system.
Please ensure you read this manual completely for procedures on
how to properly install this unit.
Description
The brand new PA amplifier series is engineered to deliver powerful,
undistorted sound. Using proven MOSFET technologies and manufacturing processes such as surface mount components, we strive for
product reliability and strict standards in quality control. Our amplifiers
are driven through rigorous load tests to ensure they operate under the
most stressful of conditions. After all, we know you will!
MOSFET technology assures your amplifier satisfies the voltage and
current demands of today’s systems. And with ultra low distortion, they
will deliver clean, crisp sound to your speakers and subwoofers.
Stability is essential in delivering a clean output signal, especially when
your speaker system drops below normal impedance levels. Our
dynamic full-range Class AB amplifiers will operate safely into 2 ohm
loads, without causing distortion to get out of control. All while reproducing a wide frequency response.
Our ground-pounding Class D amplifiers will operate safely into 2 ohm
loads, and can be summed for those power hungry subwoofer systems.
Operating at these loads will generate lots of heat. So we’ve engineered the heat sink to dissipate that heat effortlessly, while keeping
your tunes pumping hard!
Professional setup of your audio system to get the right sound is an
absolute must. With tri-mode crossovers and continuously variable frequency control, you can tweak your system for optimum speaker performance. We LOVE a great sounding car audio system too!
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Features
PA602, PA604
• Class AB Circuitry - 2 ohm stable
• Surface Mount Technology
• MOSFET Power Supply
• Frequency response from 10Hz to 25KHz
• Low Level Input – variable up to 5 volts RMS
• Gold Plated Input & Output Terminals
• Tri-mode Crossover Selection - LPF / FULL / HPF
• Variable Crossover Control from 50 to 750Hz
• Quad Protection Circuitry - Short, Voltage, Overload and Thermal
• Protection Indicator
Features
PA500D
• Class D Circuitry – 2 ohm stable
• Surface Mount Technology
• MOSFET Power Supply
• Dual Amplifier Summing – master/slave
• Gold Plated RCA Connections
• Variable Low Pass Filter Control from 40-180Hz @ 18dB/oct
• Subsonic Filter from 10 to 50Hz
• Frequency response from 10 to 180Hz
• Low Level Input – variable up to 5 volts RMS
• Heavy Duty Terminal Block for Power Input & Speaker Output
• Quad Protection Circuitry - Short, Voltage, Overload and Thermal
• Protection Indicator
PA602 PA604 PA500D
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Installation
Precision Acoustics recommends professional installation of all its products. Should you choose to install this
product yourself, please read this manual carefully and refer to the instructions detailed below. Failure to do so
may result in poor product performance, premature or immediate malfunction, and potential damage to your
vehicle or its contents.
•When selecting a location to mount your amplifier, please ensure proper ventilation is considered. Areas
below seats or in trunks are suitable, so long as air flow is not restricted. Refrain from mounting your
amplifier upside down, as heat will not dissipate effectively, and can result in thermal shutdown or
component failure
•Mount your amplifier using 4 screws, preferably onto a piece of wood. If screwing into the body of the
vehicle, be sure to check for brake, fuel or electrical lines, as well as stay clear of the gas tank.
•Using a minimum of 8 gauge wire for PA602 / PA604, or a minimum of 4 gauge wire for PA500D, run a
power cable directly to the positive terminal of your battery to the ‘+12V’ terminal of your amp. A separate
fuse must be located within 18 inches of the battery to protect the vehicle from a potential short. Total up
the fuse ratings on your amplifiers to determine the fuse size required under the hood.
•Your amplifier should turn on only when ignition is activated. This can be accomplished by connecting an
18 gauge wire to the ‘trigger’ output on your head unit. If you are using an OEM radio, this will not be
available. You must locate a +12v switched circuit to achieve this.
•The ground path is equally important to the positive feed of your amplifier. Find or create a bare metal
spot on the vehicle’s chassis. Using as short a wire as possible, connect to the ‘GND’ terminal using the
same gauge wire as you did for power. The paint on the body must be removed to bare metal.
•If you’re using a low-level output signal from your head unit, ensure to use a high quality RCA cable to
prevent unwanted noise. It is preferred to use the side opposite to the power wire to run the RCA. Failure
to do so can introduce unwanted noise into the input signal which will be heard through your speakers.
•If your head unit doesn’t have RCA, a speaker level adapter would be used. For this, it is ideal to tap in on
the speakers closest to the amplifier location. Using regular 18 gauge speaker wire, take left and right
(both positive and negative) signals. Connect directly to the ‘hi-level’ input on your amplifier. Proper gain
settings are required to ensure undistorted sound.
•You have now completed the installation portion of your new amplifier. Please continue to the “Amplifier
Settings” section of this manual to properly configure your amp for maximum listening pleasure.
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Amplifier Settings
Gain Calibration
The gain control (input sensitivity) on this amp is not a volume control. It is designed to provide proper matching of various source units to this amplifier, and provides a reference to how much signal will be necessary to
reach maximum operating power. Correct settings will ensure safe operation for both your amplifier and
speakers.
•Start by turning the gain level to the “MAX” setting. This is the minimum level, far right.
•Next, turn up your head unit volume up to 75% of max volume. For example, if your digital volume control
goes to “50”, you would use the “40” level for this exercise.
•Last, slowly begin increasing the gain sensitivity ‘counter-clockwise until distortion becomes audible, and
then turn the gain back a notch. You have now properly set your input sensitivity.
Crossover Control
Your amplifier has been designed with an onboard crossover, or filter management system. How you configure
these settings will be dependent on the speakers you are connecting to the amplifier. The crossover circuit consists of two main settings: 1. Filter Type; 2. Frequency Adjustment.
The “filter type” is controlled by a “LPF, FULL, HPF” switch. The low-pass filter, LPF, will allow only low frequency information to pass on to the speakers. The opposite would be achieved using the HPF, high pass filter.
When no filter is required, the FULL setting would be selected, allowing all frequencies to pass.
For proper operation of some speakers, it is necessary to select the crossover point to which they will play. The
“frequency adjustment” setting allows you to accomplish this. In a LPF mode, only frequencies up to the
crossover point will play, with a gentle roll-off beyond that point. In HPF mode, any frequency above that point
will be heard, with those below being filtered away gradually.
Low Level Output
Rather than running a 2nd RCA for multiple amplifiers, the low level output offered on the PA602 will provide a
full-range signal to an additional amplifier. Simply run a shorter RCA from this amplifier to the next one in line,
such as your PA500D subwoofer amplifier. Fading capability will not be possible in this arrangement.
Subsonic Filter
Getting the most out of your amplifier is our goal. Having a subsonic filter in your subwoofer amplifier is going
to achieve just that. If you’re running a ported subwoofer system, it’s crucial that the output signal from your
amplifier doesn’t drop drastically below the tuning frequency. If that should happen, your subwoofer will feel as
if it’s in open air. The result, slow and permanent damage to the voice coil.
The subsonic filter found on our PA500D offers a continuously variable setting from of 10Hz to 50Hz. This will
ensure that sub-harmonics are dropped off quickly from your desired frequency. Proper setting of this filter will
help your subwoofer play cleaner, louder and with less distortion. Furthermore, your amplifier runs more efficiently by not wasting voltage and current on reproducing unwanted or damaging frequencies.
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Amplifier Settings
Master/Slave Bridging
The PA500D is capable of running in a Master/Slave configuration. This implies that two amplifiers can be ran
in sync to the same subwoofer voice coil, or subwoofer configuration. The result of which is twice the output
than what one amplifier could offer on the same load. Please note that each amplifier in this setup will see half
the load, meaning a 4 ohm woofer will net 2 ohms per amplifier. This is the minimum impedance which the
amplifier can support in this setup.
For configuring gain and crossover, you only need to adjust this on the master amplifier. The master amplifier
will be identified by which receives the input signal from your source head unit. There is no “master/slave”
switch as typically found on other amplifiers. To configure the amplifiers, you will run from “Bridge Out” on the
master to “Bridge In” on the slave. Please refer to the wiring illustrations in this manual for a configuration
diagram.
Protection Circuitry
This amplifier has been outfitted with protection circuitry against short, overload, low voltage and thermal
shut-down. In a functional state, the NORMAL LED glows solid and indicates “power on”. Should the amplifier
sense any fault in your speakers or subwoofers, it will flash to indicate a malfunction.
The PROTECT light will glow if the amplifier detects excessive heat, reverse polarity, short circuit or overload.
In this case, shut the power to the system and allow time for cooling to bring the amplifier back to a functional
state.
If the PROTECT light remains lit after cycling the power OFF then ON, internal damage to the amplifier may
have occurred. Please return the amplifier to the original place of purchase for inspection.
Fusing
Fusing your car audio system ensures effective protection against current overload. The PA500D has been engineered without a fuse, as establishing the proper fuse value is dependent on amplifier load. When running the
amplifier at 4 or 2 ohms, the recommended fuse is 40 amps. If running in a 4 ohm master/slave configuration,
an 80 amp fuse is required.
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Specifications
PA602 PA604 PA500D
Continuous Power
• 4 ohms (RMS) 65 x 2 65 x 4 320 x 1
• 2 ohms (RMS) 100 x 2 100 x 4 500 x 1
Bridged Power
• 4 ohms (RMS) 190 x 1 190 x 2
Maximum Power
• 4 ohms 130 x 2 130 x 4 640 x 1
• 2 ohms 200 x 2 200 x 4 1000 x 1
THD <0.03% <0.03% <0.08%
Signal to Noise Ratio >90db >90db >80db
Frequency Response 10-25KHz 10-25KHz 10-180Hz
Crossover HPF-FULL-LPF HPF-FULL-LPF LPF
• High Pass (HPF) 50-750Hz 50-750Hz n/a
• Low Pass (LPF) 50-750Hz 50-750Hz 40-180Hz
Speaker Impedance 2 ohms 2 ohms 2 ohms
Damping Factor 220 @ 4 ohm 200 @ 4 ohm 190 @ 4 ohm
Input Sensitivity 200mV – 5V 200mV – 5V 200mV – 5V
Dimensions 7.25” x 9” x 2” 9.25” x 9” x 2” 7.5” x 9” x 2”
Fuse Rating 30A 40A external (see "Fusing")
INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Installation – Signal Input
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