Rear Panel Connections

wire used. IASCA and other auto sound competition organizations have charts available for this; you can also find a chart in the MECP study guide. Minimum wire gauge recommendations for the individual ampli- fiers are listed on the specification page. Always use the same gauge wire for the amplifier ground that you use for the power wire. Be sure to examine the battery ground cable of the vehicle, and if necessary, upgrade it by adding an additional ground wire that is the same gauge as the amplifier’s power wire. Remember, the amplifier can only deliver its rated output when it is not

is generated. For low-impedance speaker applications or restricted ventilation installations, an external cooling fan may be advisable.

10. Battery and ground connections to the vehicle should

be made with crimped ring terminals of the appropriate

size (surface area is what counts;) soldering the termi-

nals after crimping is also recommended.

11. Due to the high-frequency MOSFET switching power

supply, filtering the power cable is not generally required

(remember that the amp can’t deliver full output if the

ENGLISH

FIGURE 2—LED/FAN HARNESS

	BLACK		-
	BLUE		TO LEDs
			+
	BLACK		-
	RED		TO FAN
			+
			+

current limited by the power and ground supply wires.

9.This amplifier is designed to drive a speaker load that measures from 2 to 8 ohms. Keep in mind

that heat is the long-term enemy of automotive elec- tronics and the lower your speaker load, the more heat

power supply is restricted.) Proper grounding of the

signal source is mandatory for the amplifier to reach

its performance peak. If the RCA inputs are not grounded

adequately via the signal source, electrical noise from

the vehicle may be picked up in the system.

1. Fuse—These fuses protect the amplifier against

internal electrical damage and are meant to protect

the amplifier only. All other power connections

should be fused at the source.

2. (+) 12 Volt Power—Connect this terminal through

a FUSE or CIRCUIT BREAKER to the positive terminal

of the vehicle battery or the positive terminal of an

4. Ground—Connect this terminal directly to the sheet

metal chassis of the vehicle, using the shortest wire

necessary to make this connection. Always use wire

of the same gauge or larger than the (+) 12 volt power

wire. The chassis connection point should be scraped

free of paint and dirt. Use only quality crimped and/or

soldered connectors at both ends of this wire. DO NOT

connect this terminal directly to the vehicle battery

FIGURE 1—AMPLIFIER CONNECTIONS/CONTROLS—FRONT (PA250.2)

isolated audio system battery.

WARNING: Always protect this power wire by install-

ing a fuse or circuit breaker of the appropriate size

within 12 inches of the battery terminal connection.

3. Remote Turn On—This terminal turns on the amplifier

when (+) 12 volt is applied to it. Connect it to the remote

turn on lead of the head unit or signal source.

ground terminal or any other factory ground points.

5. Speaker Terminals—Connect subwoofers to these

terminals. (Refer to the Speaker Wiring Diagrams

section of this guide.)

FRONT PANEL CONNECTIONS/CONTROLS

5. X-Over Selection Switch (HPF, Flat, LPF)—

FIGURE 3—AMPLIFIER CONNECTIONS—REAR (PA250.2)

1.RCA Input Jacks—Accepts line level outputs from head units or signal processors at voltages between 250mV and 7.5 volts.

2.RCA Line Output Jacks—Thesepass-through RCA jacks can be used to send the input signal to a second amplifier.

3.Gain Control—Controls the amplifier’s sensitivity and is used to match the input level of the amplifier to the output level of the signal source.

4.Bass EQ Switch—Adds 8dB additional bass boost to the speaker output when on.

The HPF attenuates low frequencies and is used with mid-range speakers and tweeters. Flat does not attenuate any frequencies and is for full range speaker systems. LPF attenuates high frequencies and is used for subwoofers.

6.Light Bar/FAN—Allows connection of an optional LED light bar or optional cooling fan for the amplifier.

7.Status LED—Will illuminate GREEN to indicate the amplifier is on and operating normally, and will be illuminated RED if the amplifier shuts down due to short circuit, DC offset, or overheating detected by onboard protection circuitry.

8 P A 1 2 V A M P L I F I E R S

W W W . P O L K A U D I O . C O M / A M P S 9