6. 
TROUBLESHOOTING 
The 
unit 
does 
not 
work; 
no 
lights 
Sound 
is 
distorted 
No 
sound 
coming 
from 
the 
unit 
7. 
GLOSSARY 
Crossover: 
A device that limits the range 
of 
frequencies sent to a speaker or amplifier. 
Equalization: the process 
of 
boosting or cutting sound signal frequencies to improve the 
quality 
of 
the sound. The term comes from the filters used to add back high frequencies at 
the receiving end 
of 
analog transmissions over wires. 
Equalization band: the frequency range impacted by a specific filter. 
dB: 
decibel, a measurement 
of 
the relative difference 
in 
power 
or 
intensity between two 
acoustic signals 
Gain 
control: 
gain is the amount 
of 
amplification (voltage, current 
or 
power) 
of 
an audio 
signal expressed in dB 
Graphic 
equalizer: a  multi-band variable equalizer that uses mechanical controls to 
adjust amplitude. 
Hz: Abbreviation for Hertz, a unit 
of 
frequency equal to one cycle per second. 
Octave: the musical principle 
of 
dividing sound frequencies into the eight notes 
of 
the 
musical scale. 
OEM: Original Equipment Manufacturer 
RCA 
input/output: 
port through which sound travels 
in 
and out 
of 
the system; "RCA" 
refers to the type 
of 
connector, which was originally manufactured by Radio Corporation 
of 
America. 
Slope: how fast the sound changes rated 
in 
dBs. The higher the dB number, the faster 
the frequency drops off. 
EQS755 
11