Questions and answers: JVC KW-AVX820

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JVC KW-AVX820 - Car Stereo Receiver with LCD
JVC KW-AVX820
Discontinued
Accessories Help and manuals 1
What is the optical cord used for coming from the head unit to what? Is it for power amps .... and one other question, is there a pre amp for my unit kw-avx820, or is the units self contained equalizer all I have to work with? Thank you.... Dee