PA D4000.4 Owner's Manual

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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

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Polk PA D4000.4 Super Efficient Class D Bridgeable 4-Channel Mobile Audio Amplifier

Owner's Manual - Page 11