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where did you buy your subs from? if they were purchased from a big box store with a box,
you got a generic box. The right box will help. which way are the speakers firing? If your subs are close to the trunk lid opening firing against the plastic panel, your good. This helps the speakers load, which means more sound and feel. Ported boxes are very nice if tuned right. I tune are boxes for what the customer plans on doing or wants out of his or her system.
If your running the factory head unit, with a line out converter that could be part of the problem. Factory amped cars such as Bose, Pioneer, JBL, Infinity, and so on will drop frequencies once the volume starts going up. Also see what your crossover settings are on the amp. With sealed boxes I usually set the crossover at 70-100 range.
If you want to get the best out of your stereo buy a nice headunit. If your down with the stealthy factory look buy an Audiocontrol LC6i, or DQ8. Perfect stuff for factory integration.
If you have any questions on wiring or aftermarket stuff just ask. I have been running and installing for a stereo shop for 8 years. I also only run one down firing Alpine S-type 10" in a 1 cubic foot box. Not square in shape. Alpine M-450 amp, Pioneer Avic D-3 headunit, Alpine Reference Type-X 6.5"s in the doors on F-450, and zero rear fill. If you are in the Lansing, MI area look me up. Skory Autosounds... Ask for Jesse
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