Polk Audio PAD4000.4 manual Specifications, Audio cycles on and off, Distorted output, Amplifier

Troubleshooting Tips

Symptom	Probable Cause	Action To Take
Audio cycles on and off
	Thermal protection engages when	Make sure there is proper ventilation for
	amplifier heat sink temperature	amplifier and improve ventilation as needed..
	exceeds 85° C (185° F)..
	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	Readjust gain.. Refer to the Adjusting the Sound of the
	too high exceeding maximum	System section of this manual..
	capability of amplifier..
	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	Check speaker wires and repair or replace as needed..
	to amplifier properly..
	Internal crossover not	Readjust crossovers.. Refer to the Line Level
	set properly for speakers..	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	Check speaker polarity and fix as needed..
	causing cancellation at low frequencies..
	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..

Specifications

Amplifier	PA D4000.4
Type	Bridgeable
	Class D MOSFET
Channels	4 channel
RMS Continuous Power	125 W x 4
@ 4 Ohms
RMS Continuous Power	200 W x 4
@ 2 Ohms
Power Bridged @ 4 Ohms	400 W x 2
Distortion at Rated Power	<0..1%
Minimum Impedance Bridged	4 Ohms
Minimum Impedance	2 Ohms
Not Bridged
Signal-to-noise Ratio	105dB
Frequency Response	20Hz-20kHz
Damping Factor	>100
Crossover Filter Slope	12 dB/octave
(dB/octave)
Filter Switch (Front)	3-position
	(HPF, Full, BPF)
High Pass Filter	20Hz - 4kHz
Frequency Range (Front)
Low Pass Filter	50Hz - 5kHz
Frequency Range (Front)
Front Gain Control	200mV - 6V

Amplifier	PA D4000.4
Filter Switch (Rear)	3-position
	(HPF, Full, BPF)
High Pass Filter	20Hz - 4kHz
Frequency Range (Rear)
Low Pass Filter	50Hz - 5kHz
Frequency Range (Rear)
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)

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