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Most of the time you'll want the port and sub on the same face of the box. Generally, putting them 180 degrees from each other is the worst thing to do. Not to mention that the port will have depth to it, which might run into the motor in the boxes you drew up. If you want the kick drum in rock to sound the best, generally your best bet is sealed. A ported box will exaggerate the 30-45 hz range, and to some that sounds boomy or too exaggerated. But also to some that is exactly what they like.

Low voltage is not the same as NO voltage. The damage caused by low voltage conditions is excessive current draw. With the open circuit from the blown fuse there is no current draw and damage is impossible.

I agree. WinISD can be useful, but how the shop is using it is not helpful at all. Is that 4-4.5 cubic feet of space before port and sub displacement? If so, just make the box as large as possible to get the most net volume out of a sufficient port. Are you planning to use aeros or slot port?

guidelines here

No, it cannot be damaged.

I have not seen to much other than burp from the dd z ... my self i wonder what a z would do in a 35 hz 5 cube box ... to be honest i would like to put 4 warden 15's in my ride and see what happens ... pretty sure it would be an awsome ride ... I also have seen a few vids on the d/p's and they look like and awsome driver aswell ... long story short id put my bets on the warden being a force to be reckin with .. the d/p's and wardens are bad azzz