I have 6x9's in my parcel shelf and 2 twin vibe subs. Wot i did was cut a vent in the middle ov the 6x9's. I then turn my amp and 6x9's off. The subs didnt even move the 6x9's. Think letting more air into the boot helped. Makes the subs sound better aswell. Even a ex sound engineer said it sounds wicked. I think its up2 the person about 6x9's. I have good front speakers aswell.
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