1) No you can't use the speaker's cable to go in the input in the amp because it is a High-Level signal. Your head unit must have a Low-Level signal output (two cinch) to go into the amp for a subwoofer.

[Moderators Note... this does depend on the amp...some DO have hi-level inputs so you can use speaker wires]

2) No, the amp needs a proper energy feed. For example a 260watts RMS amp needs about a 30A cable (quite big) and it must be connected directly to the battery.
You can use the antenna's power cable to turn on and off your amp (and sub) but I would suggest you to install a switch so you can turn on and off the amp whenever you want.

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WEB Site : http://www.adamou.dpn.ch
A.S.C. 1999
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[This message has been edited by bdrought (edited 01-30-2000).]