Important information – Numark Industries DM1720X User Manual
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
• 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
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.
• 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
• 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
• 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
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