speaker location

[Innuendo]

All car sound equipment as far as I remember is 4 Ohms if that helps.

The more modern stuff is typically 4 ohms but it is not true of all car speakers. Early Holdens are 15 ohms, so always check.

Here is an option for you.
http://www.ebay.com.au/itm/Holden-HQ...-/111190839929

hq-hz_dash_speaker_conversion_zpsc7ad4438.jpg