Altima is loudest with the subs up. So is a Mazda Protege. The cars with the smaller trunks are usually the ones that get loudest with subs up. These types of cars like to load on the rear deck and some times the rear window.
Another advantage to firing subs up is that the trunk lid can act as a loading wall. This can increase the power handling of a sub dramatically mechanically wise.
I rest my case lol
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