Polk Audio PAD4000.4 - Manual (Page 6)

10 © 2011 Polk Audio—all rights reserved © 2011 Polk Audio—all rights reserved 11
Audio cycles on and off
Thermal protection engages when
amplifier heat sink temperature
exceeds 85° C (185° F) . Make sure there is proper ventilation for
amplifier and improve ventilation as needed .
Loose or poor audio input . Check line level connections and repair
or replace as needed .
Loose power connections . Check power wires and ground connections
and repair or replace as needed .
distorted output
Amplifier level sensitivity set
too high exceeding maximum
capability of amplifier . Readjust gain . Refer to the Adjusting the Sound of the
System section of this manual .
Impedance load to amplifier too low . Check speaker impedance load if below (2 Ohms, 4 Ohms
min bridged); rewire speakers to create higher impedance .
Shorted speaker wires . Check speaker wires and repair or replace as needed .
Speaker not connected
to amplifier properly . Check speaker wires and repair or replace as needed .
Internal crossover not
set properly for speakers . Readjust crossovers . Refer to the Line Level
Inputs/Controls section of this manual .
Speakers are blown . Check system with known working speakers
and fix or replace as needed .
Poor bass response
Speakers wired with wrong polarity
causing cancellation at low frequencies . Check speaker polarity and fix as needed .
Crossover set incorrectly . Reset crossovers . Refer to the Amplifier Settings section .
Impedance load at amplifier is too low . Check speaker impedance load if below (2 Ohms, 4 Ohms
min bridged); rewire speakers to create higher impedance .
Battery fuse blowing
Short in power wire or incorrect wiring . Check power wires and ground connections
and repair or replace as needed .
Fuse used is smaller than recommended . Replace with proper fuse size .
Actual current exceeds fuse rating . Check speaker impedance load if below (2 Ohms, 4 Ohms
min bridged); rewire speakers to create higher impedance .
Amplifier fuse blowing
Fuse used is smaller than recommended . Replace with proper fuse size .
Impedance load at amplifier is too low . Check speaker impedance load if below (2 Ohms, 4 Ohms
min bridged); rewire speakers to create higher impedance .
Speaker is blown with shorted outputs . Check system with known working speakers
and fix or replace as needed .
Actual current exceeds fuse rating . Check speaker impedance load if below (2 Ohms, 4 Ohms
min bridged); rewire speakers to create higher impedance .
TrOuBLESHOOTINg TIPS
Symptom Probable Cause Action To Take Amplifier PA d4000.4
Type Bridgeable
Class D MOSFET
Channels 4 channel
RMS Continuous Power
@ 4 Ohms 125 W x 4
RMS Continuous Power
@ 2 Ohms 200 W x 4
Power Bridged @ 4 Ohms 400 W x 2
Distortion at Rated Power <0 .1%
Minimum Impedance Bridged 4 Ohms
Minimum Impedance
Not Bridged 2 Ohms
Signal-to-noise Ratio 105dB
Frequency Response 20Hz-20kHz
Damping Factor >100
Crossover Filter Slope
(dB/octave) 12 dB/octave
Filter Switch (Front) 3-position
(HPF, Full, BPF)
High Pass Filter
Frequency Range (Front) 20Hz - 4kHz
Low Pass Filter
Frequency Range (Front) 50Hz - 5kHz
Front Gain Control 200mV - 6V
Amplifier PA d4000.4
Filter Switch (Rear) 3-position
(HPF, Full, BPF)
High Pass Filter
Frequency Range (Rear) 20Hz - 4kHz
Low Pass Filter
Frequency Range (Rear) 50Hz - 5kHz
Rear Gain Control 200mV - 6V
Line Level Inputs (y/n) Yes
Line Level Outputs (y/n) No
LED Power Indicator Yes
LED Protection Indicator Yes
Supply Voltage 10V - 16V
Fusing & Power/Type (1) 40A (1) 35A ATC
Power Connections 4 AWG
Ground Connections 4 AWG
Speaker Connections 12 AWG
Height 1 13/16" (46 mm)
Depth 6 3/4" (171.5 mm)
Width 10 15/16" (277.8 mm)
Width w/ Terminal Adaptor 11 11/16" (296.9 mm)
Weight 5 lbs (2 .7 kg)
SPECIFICATIONS