Mounting depth question??

[cjj2d 0]

I am wondering what the mounting depth of a 15D2 is? and also how much room behind it (between the magnet box) should you leave?thanks.

[Electrodynamic 2]

8 and 1/8'th mounting depth and as a general rule you should always leave around 3" behind the vented pole piece (for any speaker with a vented pole) for adequate breathing room.

[hmmm... 0]

3 inches! would it be ok to stretch that to 2 inches( for a 12 inch)

my box design only has aboout 2.1 inches behind the sub.

[Electrodynamic 2]

Well you can do whatever you want, but 3" is the general rule. I definately wouldn't go any shallower than 1" no matter what.