Hi all, I'm new to the forum and haven't done much with car audio since 2008'ish. I'm planning a very simple system for an old '98 F-150 extended cab. Going to be running an aftermarket HU, 2 sets of 6x8's (Kenwood KFC-C681 - 81w RMS - 4 ohms) or 6.5's (JBL GX628 - 60w RMS - 2 ohms) in front &...