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What subs are you using?

The best way to mount them would be facing back, towards the bootlid and tail lights. Why? It's called bass loading. You see, Bass waves are long, and get slightly louder after travelling a short distance. Face them back, and i assure you that you will get alot of bass in your cabin. Removing the seats won't really make it louder. People seem to think subwoofers work like normal speakers, and that the speaker is the thing making all the noise and if you face it straight into the cabin it's going to be louder. Not the case. A subwoofer generates the frequency waves, however the box is what makes all the noise. This is why when you just sit a subwoofer on the floor with no box, it will jump around and vibrate, but you wont hear much.

So,

Mount your subs facing the bootlid/tail lights, and you should be pretty happy with the SPL.

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