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6.5", although I've discovered in the past that not all speakers fit in the integra. Their is not alot of room for a bigger magnet. Also their is very little wire in the rear to work with so it makes it difficult to replace.
If depth is an issue as it will be for me soon, make mounting plates from plywood to bring the speaker basket out from the door a little so you can still roll the windows down. :wink:
I've found it easiest to use 6" speakers. most aftermarket 6" fit well. I use JL audio and they fit tine with not modification except cutting the stock plastic basket they sit in.
