Bedienungsanleitung DLS RA 30 (Seite 10 von 12) (Englisch)

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NOISE PROBLEMS

WHINING NOISE VARYING WITH ENGINE

REVOLUTIONS:

Do this:

1. Rewire the power supply (12 V) to source

unit direct from battery.

2. Rewire ground wire from source unit to

clean position on chassis.

3. Check all power connections to ensure that

they are clean and tight.

4. Check quality of system ground connection.

5. Install a Power Cap capacitor. This can be

helpful against most noise problems.

CONSTANT WHINING NOISE:

Do this:

1. Ensure that all equipment has a common

ground point.

2. Check quality of earth strap connection from

battery negative terminal to chassis.

3. Disconnect signal cables from amplifier to

see if noise disappears. If so the leads are

picking up noise. Test this by laying a new

cable over the seats and reconnecting to the

amplifier. If the noise does not return, re-

route original cable away from source of

interference.

If noise remains regardless of cable position,

try to use so called Quasi-balanced signal

cables. DLS PRO-cables are

Quasibalanced.

SPEAKER POLARITY CHECK.

All speakers in a car audio system should be

connected in phase (the same polarity). All spea-

ker cones must move in the same direction. Out of

phase speakers will cause a lack of bass, and a

poor stereo soundstage.

Checking polarity:

Hold the - connection of the speaker wire to the -

terminal of a 1,5 Volt flashlight battery. Tap the +

wire on to the + terminal of the battery, and observe

the movement of the cone. The cone should move

outwards when the wire touches the battery, and

inwards when the battery is removed. If it is the

other way around, the speaker has been connected

backwards and it must be removed and connected

correctly.

If your system also has a subwoofer connected

through a passive 6 or 12 dB crossover, try to

connect this with various polarity and judge what

sounds best. The phase shift in passive crossovers

sometimes makes it necessary to change polarity.

Battery

1,5 Volt

NOTE! Tweeters can not be tested this way,

double check the connections instead.

Professional Tip:Professional Tip:

Professional Tip: Professional Tip:

Installing in trunk

When installing the amplifier in the trunk, run the

power wires along the same path as the other

vehicle wiring. Many cars have insulated channels

for wiring. you will have to remove the door sill trim

and the carpet.

Securing wires

Use wire ties to bundle together when possible.

(But never bundle speaker wires or signal cables

together with power wires.

Professional Tip:

Speaker and power wires

Do not run speaker and power wires next to each

other. Power wires can generate a ”siren” sound in

the speakers. Run speaker and power wires on

opposite sides of the car.

Crimp connections

Purchase crimp connectors and crimping tool.

Connectors are color coded.

1. Strip 1/4 inch (6 mm) of insulation from the wire.

2. Insert into connector

3. Crimp tightly

RA20 & RA40

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DLS RA 30 Seite 10

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