英文關鍵字
amplifier
analog
analysis
apparatus
appliance
audio
check
control
decibel
device
dial
electronic
equipment
gauge
hear
industry
instrument
isometric
laboratory
level
loud
measure
measurement
measuring
meter
music
noise
output
overdrive
power
precision
record
recording
safety
scale
science
signal
sound
speaker
strenght
strength
studio
surround
technology
tester
tool
unit
volume