What does an mdf trunk floor do for you?

[The Camry]

Does it stop your bass from resonating through the car or what all does it do?

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[Jeffdachef 5,000+ posts]

keeps your heavy subwoofer box from breaking your stock carpet/cardboard false floor from breaking, gives you something to mount your amps on. Besides that, i think thats it. Pretty sure there's very minimal(if any) acoustical gains from doing so and even less vibration control/deadening gains from doing so.