Dual DMA804D Istruzioni operative

INSTALLATION / OWNER'S MANUAL

Marine Power Amplifiers

DMA802D-DMA804D

INSTALLATION

Preparation

Please read entire manual before installation. Due to the technical nature

of amplifiers, it is highly recommended that your amplifier is installed by a

professional installer or an authorized dealer.

Before You Start

• Disconnect negative battery terminal. (consult a qualified technician for

instructions)

• Avoid installing the amplifier where it would be subject to high temperatures, such

as from direct sunlight, or where it would be subject to dust, dirt or excessive

vibration.

• Use extreme caution when drilling holes to avoid damaging fuel lines or existing

vehicle wiring.

• All amplifier installations require power, signal and speaker wires (not included).

• An amplifier installation kit (sold separately) is highly recommended to facilitate

the installation. Consult your dealer for recommendations.

Mounting Location

• Choose a mounting location for the amplifier. Suggested locations include under a

seat or in the trunk.

• The amplifier can be mounted horizontal (recommended) or vertical. For optimum

performance, make sure to provide at least 1" of space around all sides. Do not

mount the amplifier under carpets or where airflow is restricted.

• Do not install the amplifier where it may be exposed to moisture.

• The optimum mounting location varies between vehicles. Remember to test all

amplifier functions before completing the final mounting procedure.

TYPICAL

MOUNTING

METHOD

NOTE:

Be sure to follow specific instructions included with your amplifier installation kit

(not included with this amplifier). The information below should be used as a general

guideline only.

Power Wire (+12V)

• Disconnect negative battery terminal before proceeding. Consult a qualified

technician for instructions if you are unsure.

• Plan wire routing before cutting any wires to length. Begin by routing the power

+12V wire from the battery to the amplifier location. Use a grommet when running

wires through the firewall or metal openings. Avoid running the power wire near

existing vehicle wiring to prevent induced noise from entering the audio system.

• Use extreme caution when drilling holes to avoid damaging fuel lines or existing

vehicle wiring.

• The +12V wire MUST be fused within 18" of the battery for protection of the vehicle’s

electrical system.

Ground Wire (GND)

• The amplifier ground wire should be as short as possible (no more than 36" or

1 meter). Choose a clean unpainted section of metal or the vehicle chassis when

attaching the ground connection. Be sure to clean the area of any dirt or grease.

Remote Turn-on Wire (REM)

• The remote turn-on wire connects to the head unit's amplifier turn-on lead or

power antenna output.

Speaker Wires

• Choose adequate gauge speaker wire depending on your exact amplifier/speaker

combination. Be sure to observe polarity when connecting.

• Do not ground any speaker wires or connect any speaker wires together.

Input Signal

• The amplifier's input signal connects to the head unit's low level (RCA) or high level

(speaker wire) outputs.

• Low level input signals deliver the best performance. If unavailable, use the high

level inputs - when interfacing with factory head unit for instance.

CAUTION

• Do not use both low and high level inputs at the same time. Connect only one or the

other.

• Keep low level inputs away from any power wires to avoid engine noise.

• Never run any wires underneath or outside the vehicle.

INSTALLATION

Connection Descriptions

High-Level Inputs (Speaker Wire)

Line In / Line Out (RCA)

Gain

Bass Boost

High-Pass Filter

Low-Pass Filter

Crossover Control

INSTALLATION

Audio Inputs and Controls

HIGHINPUT

(L) (L)

(R) (R)

DMA802D

DMA804D

21 3 4 5 6 7

12456 7

INSTALLATION

Power and Speaker Connections

Ground Connection

Remote Turn On

Power/Protect LED

+12VDC Battery Connection

Fuse(s)

Speaker Connections

DMA802D

DMA804D

INSTALLATION

Typical Wire Routing

DMA802D

Main Power Connections

The illustrations on pages 6 and 7

demonstrate three different wiring

options for each unit. Once desired

configuration has been selected,

connect the +12V, GND and REM

wires accordingly. A suitable fuse

MUST be installed on the +12V lead

within 18" of the battery for

protection

of the vehicle’s electrical system.

INSTALLATION

Typical Wire Routing

DMA804D

Fuse Rating

When replacing fuses, make sure new fuse

is the correct type and amperage. Using an

incorrect fuse could damage the amplifier.

DMA802D -25A

DMA804D - 25Ax2

Power/Ground Wire Size

For optimum performance, use only the wire

size listed below or larger. Make sure to use

the same size power and ground wire.

DMA802D -8 awg

DMA804D - 8 awg

Input Signal Connections

Low Level Input (RCA)

Low level (RCA) input signal is preferred for best performance. Typical trunk-

mount amplifier installations require a 17-20 foot RCA cable. Most trucks

and under-seat applications require a 6-9 foot RCA cable. Using twisted pair

construction RCA cables will minimize noise.

High Level Input

(Speaker Wire)

High level inputs should only

be used when RCA outputs are

not available from the head unit.

Connect the head unit speaker

outputs to the high level input

connector as shown below. The

black wire (signal reference

ground) may or may not require a

connection to chassis ground

- depending on your particular

installation.

Low-Level Input

(RCA)

Speaker Connections

Connect speaker wires

observing polarity. The

minimum impedance load

for the amplifiers is 2 ohms

stereo and 4 ohms bridged.

Use of loads lower than these

is not recommended and may

cause amplifier damage. The

amplifiers can be wired for

stereo, bridged or stereo/

bridged simultaneous

operation.

Speakers (bridged)

Typical Bridged Wiring

(4 ohms minimum)

2 Speakers (stereo)

Typical Stereo Wiring

(2 ohms minimum)

Note: Do not use both low and high level inputs

at the same time - connect only one or the other.

INSTALLATION

Amplifier Connections

INSTALLATION

The input level control (gain) is used to obtain the

best possible match between the head unit audio

output and the amplifier input. Begin by turning

the input level control fully counterclockwise. Next,

turn up the head unit volume control around 3/4 of

the way up. Adjust the input level control clockwise

until audible distortion is heard, then slightly

counterclockwise to provide the best match.

Repeat for all input level controls.

The crossover is used to filter out frequencies

above or below a certain point. Choose LPF when

using the amplifier with subwoofers, HPF when

using with midrange/tweeter combinations and

FLAT when using with coaxial-type speakers.

Note: Choose FLAT when using the amplifier in

stereo/bridged simultaneous mode. In this mode,

passive crossovers are required. Failure to use

the correct passive components may damage the

amplifier and/or speakers. Consult a qualified

professional for recommendations.

This control allows precise adjustment of the

crossover frequency.

This control provides additional boost @ 45Hz

when used with subwoofers. Adjust this control

with caution - as improper use can damage

speakers!

Colored LED indicators illuminate from the plastic

power terminal. The blue LED illuminates during

normal operation (POWER) and the red LED

indicator is visible when the amplifier detects a

fault (PROTECT).

Input level Control

Crossover Mode

Crossover Control

Bass Boost

Power / Protect

Indicators

Configuration/Setup

INSTALLATION

Specifications

Power Output

•80 Watts x 2 channels @ 4 Ohms

•120 Watts x 2 channels @ 2 Ohms

•240 Watts x 1 channel (bridged)

Peak Music Power Output: 600 Watts

Signal to noise ratio: > 75dB

Frequency response: 20Hz -20kHz

Amplifier dimensions: 7.2” x 5.0” x 1.8” (182.5 x 127 x 46 mm)

Power Output

•80 Watts x 4 channels @ 4 Ohms

•120 Watts x 4 channels @ 2 Ohms

•240 Watts x 2 channels (bridged)

Peak Music Power Output: 1200 Watts

Signal to noise ratio: > 75dB

Frequency response: 20Hz– 20kHz

Amplifier dimensions: 9.4” x 5.0” x 1.8” (237.5 x 127 x 45 mm)

DMA802D

DMA804D

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