Without really looking at our stock speakers, are we running 5-1/4" or 6-1/2" in the doors (2009, second gen. Fit)?

Thanks in advance.

 

Thanks man, that's a great start! I am in the market for a new 4 channel so there's no reason I couldn't choose one to fit under the seat. I have a Zed Audio Minilith for my sub which is a freakin' BRICK. I highly doubt I could fit that under a seat, but I can't part with it. I'll keep thinking about that one.