Alpine 3900

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I got 2 questions regarding it.

Q1: It requires fixed level line input using RCA/optical.It was meant for the head unit with Fixed-level line output like 7618/7619 or using other Digimax range. How am I suppose to connect it to other Head Unit using optical cable? Or other options that I have, use Master volume controller connected to the output channel?

Q2: It's an old unit, is there any chance for me to mod/upgrade the unit to make it better?
 
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