First, what are the settings on the HU? Sub on? Sub volume level? X-over? These will all depend on your HU and may be slightly different, but playing around with them may find something that increases the output.
Second, whats the amp set at? Is the xover on LP? Bass boost on? Whats the gain (this usually the first thing to check with the amp) set on? If you know you HU doesn't have any kind of bass features adjust this first. If it does though, the gain can be all the way up but if the HU settings don't corrospond, it wont matter.
Third, is the sub connected properly? Crossed wires can affect the sound greatly too.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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