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Can't really help you much without more information. Make and model of car and system. I don't compute with the term "compact stereo system in my car" because compact stereo is a term used in home systems
Unhooking the negative cable is to reset the internal electronics of the player. Holding the eject button or other buttons is for mechanical/mechanism reset. The error message "Er8" is the code produced
It depends on the quality of the DAC. I've heard good and bad conversion quality. One thing to remember also is that regardless of the sample rate of the mp3, it is a very lossy format, and no DAC will
The Rockford Fosgate 15" subs, T115D4, are 4 ohm but dual voice coil. So, driving them with a mono-block amp is easy. You will want to put the voice coils in parallel providing each amp with a 2 ohm
If you have only one sub with a single voice coil you only need a single channel amp. OR: you can use a two channel if it has bridging. If the sub is dual voice coil you can still drive it nicely with

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