well in order for us to tell you, you also have to post port dimensions, and tuning, etc.
edit: i can also guarantee you that your amps aren't outputting 2000w a piece. they never will.
they are putting around 1800 (according to a friend that clamp them)
here is the box specs
here is a pic of it when I was building it
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tuned around 33hz
Bl's are 18"s