Rear Panel Connections; Front Panel Connections/Controls - Polk Audio PA250.2 Owner's Manual

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

FRONT PANEL CONNECTIONS/CONTROLS

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—These pass-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.
8 P A 1 2 V A M P L I F I E R S
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
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.
5. X-Over Selection Switch (HPF, Flat, LPF)—
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.
FIGURE 2—LED/FAN HARNESS
BLACK
BLUE
BLACK
RED

REAR PANEL CONNECTIONS

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
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.
FIGURE 3—AMPLIFIER CONNECTIONS—REAR (PA250.2)
ENGLISH
-
TO LEDs
+
-
TO FAN
+
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
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.)
W W W . P O L K A U D I O . C O M / A M P S 9