Thinking of getting a new sound system. Does anyone have an idea of what size speakers I need to get? Is it 5.25?

Thanks

 

I my self have two 5 1/4" in the front doors (It's the original size for the doors). Two 6x9" in rear hatch (opened up hole to fit). And a 10" sub in the rear passenger pocket. And a 1400 watt 5 channel amp. under the rear seat. Which gives me 250 watts each to the four corners, and 400 watts to the sub. There's is threads on here for the hatch, and sub mounting. My sounds great, like a concert hall. with more power than I ever need. Not just the thump from the sub.