1000 watt crossfire vr1000d and 2 pioneer premier 10's dual 4 ohm 800watt rms each. 1 ohm final load .trunk mustang 1987. the box i have now is 11x 38 x 15.5 '' subs fired forward.

Shitty design kills a subwoofer. Where are the indestructable ones?

A lot of things will kill a sub. To much power, distorted power, over excursion, box size, port size. The main thing for daily driving on a decent sub is to watch your thermal power handling. meaning the coils. folded cones and ripped surrounds are less of a worry then hammering on a sub for an hour or more with to much power or slighty clipped power when cruising around.

well i've always tried to build a box to manufacturer spec's, but it is it "safe" to make the port bigger to change the reccomended frequency?

just do the opposite of what i do and they'll be fine chris

just get beamriders to build your box... if its a blown sub you want......... its a blown sub you wil get!

TO answer the original question "what kills subs?" the answer is simply stupid people.

x2

lots peopleare retards with there gear. A sub is only as good as the person installing it, and building the box... 28hz is pretty damn low for subs LOL

I wouldnt go anymore then 15-16 sq" of port per cubic feet for daily driving. Generally speaking tuning around 32-35hz with 12-13 sq" port per cubic feet is a pretty decent guideline to follow. Gives u pretty good range for daily. As far as net area that has to be determined by how much power ur gonna give a sub and how efficient u want the design to be with a given amount of power.

I dont post BS if you dont bealive me too bad, Kicker CVR 12 with a AB 500.1 (turned way down).