What are AV receiver and AV amplifier?

I turn down the woofer volume to medium low, can hear a little bit of bass, i think i will get used to it later.
 
This is a cheap subwoofer, i check that its spec is ok, frequency response 20Hz-165Hz, power output 135W, max 230W, 10" speaker.
Epipheny.jpg
 
It was suggested by people to set the crossover frq to 80Hz, and i found that my woofer has a range of crossover frq from 80~125Hz
 
Optical coaxial cable can improve how much the sound quality, right now i am using normal coaxial cable to link my DVD player to the amplifier.
 
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