Originally Posted by markayash
Crutchfield recommend a kenwood KFC 1664S which didn't get the best reviews on amazon but also said I need a mounting adapter that fits 2006 honda and up and speaker adapters for 1990 hondas and up..Reading the post I am not sure the wiring adapters will work but don't know if I need the mounting adapter...In my Civic I just bought 6 1/2 and they bolted straight in.
CF is usually good with automatically providing the accessories needed for the speaker you buy so it fits correctly. This is shown by you telling them what car you have, and they provide a list of available speakers that will work, along with additional speakers that will work via adapters.
What CF doesn't mention, is that the reason you need a bracket on all speakers is because Honda's OEM speakers are one piece: the bracket and speaker are one solid piece of plastic. That's why you need a bracket, regardless of size.
I believe it said that the speakers on the '13 Accord are 5&1/4, so going up to a 6&1/2 will need an adapter(depending on how the speakers mount). You shouldn't have any problems, but I would still pass on that Kenwood model. Also, unless you have power going to them, they probably won't sound any better since you have the same amount of power trying to fight against a larger, stronger magnet.
You can see here how the OEM speaker(right) is a one piece consisting of the speaker and mounting bracket. The left speaker is a Polk db6501:
Note the magnet size difference. O.O The tweeter of Polk db6501 component setup weighs more than that whole OEM speaker on the right!
I would post more photos of the work on the Pilot, but I'm not sure if anyone want to see them.