Important information – Numark Industries DM1720X User Manual

Page 5

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DM1720X

IMPORTANT INFORMATION...

Please read this entire manual before connecting the DM1720X to your system.

For optimum performance:

• Always make sure that AC power is OFF while

making any connections.

• Do not use excessively long cables (i.e. over

50ft/14m) Be sure plugs and jacks are tightly mated.

Loose connections can cause hum, noise or

intermittents that could easily damage your speakers.

• Never use spray cleaners on the slide controls.

Residues cause excessive dirt build-up and this will

void your warranty. In normal use slide controls can

last for many years. If they malfunction (usually

because of a dirty or dusty environment) consult a

professional technician.

• Never attempt to make any adjustments or repairs

other than those described in this manual. Take the

DM1720X to your dealer or to an authorized Numark

Service Center.

A NOTE ON CABLES:

Make the input and output connections with

readily available low-capacitance stereo

cables. Quality cable makes a big difference

in audio fidelity and punch. Use balanced

connections whenever possible. See your

Numark dealer or an electronics or audio

specialist store if you are not sure which

cables to get.

SYSTEM PRECAUTIONS

• Use appropriate cables throughout your system:
Quality shielded audio cables and terminated shielded
video cables, low-capacitance preferred. Speaker
cables must be 14-gauge minimum; 12- or 10-gauge is
better.

• Reliability will be enhanced through the use of
banana connectors on the speaker wires. Observe
correct speaker wire polarity. If in doubt, consult your
Numark dealer or a qualified technician.

• Take care to connect only one cable at a time. Pay
attention to the color-coded, labelled Input and Output
jacks.

• ALWAYS remember: “TURN AMPS O N LAST
AND OFF
FIRST”
. Begin with master faders or
volume controls on minimum and the amplifier
gain/input control(s) down. Wait 8 to 10 seconds
before turning up the volume. This prevents
transients which may cause severe speaker damage.

• Use restraint when operating controls. Try to move
them slowly. Rapid adjustments could damage
speakers due to amplifier clipping.

Avoid amplifier “clipping” at all costs: this
occurs when the red LEDs (usually on the front panel
of most professional power amplifiers) start flashing.
“Clipping” is when the power amplifier is distorting
and working beyond it’s limits. Amplifier distortion is
THE major cause of speaker failure.

• To prevent fire or shock hazard, do not expose the
unit to rain or moisture. Never place cans of beer,
soda, glasses of water or anything wet on top of
the mixer!

Numark - The Proven Leader in DJ Technology

©1998 Numark Industries

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http://www.numark.com

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