We recently had our interior speakers stolen out of our 2008 Supra 21V launch... so now I am looking to buy new ones to replace them.

First of all, this is a stupid question, but what size speakers were in the boat to begin with? Secondly, does anyone have recommendations as to what I should replace them with? I would probably be looking to put fairly good quality ones in. Lastly, if I do replace them should I be considering buying a second battery? I don't know if better speakers would drain a single battery too much.

Thanks!!