Why does DD rec. Tuning 40hz?

Their subs are designed to work well in those enclosures. Tuning much lower will cause them to be even more power hungry and will draw a peak around tuning. It will also help them meter higher which will give their subs a rep of being loud. They also have pretty stiff suspensions which helps out a lot below tuning since the pressure in the enclosure quickly drops off below tuning.

 
you guys are soo funny dd's arent made to be spl subs. they just became popular because theyre know for handling tons of power therye all made to sound good .and about the higher tuning thing if ya wanna tune lower then 35hz get composite cones and you will have amazing subwoofers....

i run 2 crossfire 2000s on a 9515 daily and it sounds great.....

 
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