amplifier
analog
analysis
audio
check
clip art
clipart
control
db
decibel
dial
electrical
electronics
equalizer
equipment
gauge
graduation
graph
graphic
icon
illumination
image
indicator
instrument
interface
level
loud
max
maximum
measure
measurement
measuring
meter
minimum
music
noise
patch
physics
power
scale
signal
sound
steel
stereo
technology
volume
vu
watt
white
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