APX/DPX Amplifiers 23
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Ticking noise when engine on
• High voltage ignition problem: Check for problems with the ignition system and
replace components as required.
• Cracked distributor caps
• Carbon traces on plug wires
• Loose spark plugs
7. Glossary
Crossover
: A device that limits the range of frequencies sent to a speaker or amplifier.
dB
: decibel, a measurement of the relative difference in power or intensity between
two acoustic signals.
Equalizer
: Component that boosts or cuts sound signal frequencies to improve the
quality of the sound.
Gain control
: gain is the amount of amplification (voltage, current or power) of an
audio signal expressed in dB.
Hz
: Abbreviation for Hertz, a unit of frequency equal to one cycle per second.
IVS
: Input Voltage Selector
Octave
: the musical principle of dividing sound frequencies into the eight notes of the
musical scale.
Ohm
: unit of electric resistance
PFS
: Precise Frequency Selector
RCA input/output
: port through which sound travels in and out of the system; “RCA”
refers to the type of connector, which was first manufactured by the Radio Corporation
of America.
Slope
: how fast the sound gets quieter rated in dBs. The higher the dB number, the
faster the frequency drops off.
APX-DPXOwnersManual.pmd 2006-03-14, 21:4723
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