I did both and, yes, it makes a difference.Did anyone who has done the amp upgrade also have a spare tire? I read that removing the foam and replacing it with a spare improves the bass from the sub...even without the amp upgrade.
You are correct. The area where the Bose amp lives is empty in the Sport, looks like this:I was operating under the assumption that the Sport Z didn't have an external amplifier like the Bose does.....
This is removing the hard foam the sub sits in and replacing with a spare? How about the foam padding, removed?I did both and, yes, it makes a difference.