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I have 3 JL Audio 10w3v2_d4 subs I want to mount inverted. My question is, when calculating air space, is the formula the same as traditional mounting and is there a difference in the way they sound?

First of all, welcome to the forums.

Second of all, you realize that wiring 3 of those 4 ohm subs together will yield you a 1.33 ohm load (i think) to your amplifier.

Third of all, calculating airspace is the same. You just dont have to take into account sub displacement. Also, make sure you reverse the polarity so that the subs dont fire into the box. Just hook negative to positive to your amp, and positive to negative.

Hope this helps!

if your running a jl mono slash series amp they dont care....or anything 1 ohm stable where you will get into trouble is with a 2 ohm stable amp

True...i was just saying that because its a wierd load on the amplifier (if its not JL or any other company that makes a regulated amp).

yes, Im going to run the JL 500/1 to them, Im just still wondering about the reverse polarity wiring

About the reverse polarity wiring.

Just wire the subs up like you would normal. but instead of putting the positive wire on the positive output on the amp, switch the negative and positive.

This way, instead of the sub firing into the box, it fires out of the box like normal.

edit: You are only running a 500/1 to 3 w3v2's? Thats not a lot of power...

Yes, I know what reverse polarity is, I just never thought about wiring it that way. I know 500 watts isnt a lot to those subs, but is was the best way for me to go with what my set up is

Oh, ok. I didnt know exactly what you were confused on. Sorry if i came off as rude or somethin.

Im sure what you have will sound just fine. Im assuming this is a sealed enclosure? Cant wait to see pics!