英文關鍵字
amplifier
analog
audio
bass
board
bright
closeup
console
control
device
display
electronic
electronics
equipment
gauge
hearing
indicator
information
instrument
loud
max
measure
meter
metering
min
multimedia
music
old
player
power
resonance
retro
rhythm
round
scale
sound
stereo
switch
system
technology
tool
tuner
turn
vintage
volt
voltage
voltmeter
volume
work