As the above posted said there is definitely no RCA/low-level output from the VE Commodore deck. You'll need either an amp with high level input or a high-to-low converter (also known as a LOC – line output converter). Also the bit about grounding issues and whine is spot on, so you'd be best to read up on what has and hasn't worked on other people's installs. If you Google it there are a few forums with plenty of info. To make decent sound you really need two subs, one for each channel, i.e. Left and right, or it is going to sound strange. Not true, the amp will sum both of the channels together and one sub sounds perfectly fine, bass isn't directional to the degree that mids and treble are.

The Difficulty Of Being Good Epub Free Download. When I was putting twin 8' subs in my ute I looked into this and general consensus was that stereo was a waste of time and to just run them in parallel/mono. Personally though I would upgrade the speakers first then worry about the sub. Here is a DIY: A cheap speaker people seem to like in the Commodore/G8s is the Polk DB651 for the rear and front (if you don't want to replace the tweeters) or use Polk DB6501 in the front and you'll have to run wires back through into the cabin and upto the tweeters. Also most people recommend disconnecting the centre speaker.