amp "feed" would be live when off (off meaning key out, no radio sending signal, amp is not on although it does have power available at the amp connection site), but only the main feed (1 wire, usually run directly from battery, with ~ a 30amp inline fuse). if you find more than 1 live wire at the amp when "off" this is where the issue lies (but I have a suggestion if you do find more than 1 live wire).
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