box tuning?

My instincts tell me it came about something like this:

Memphis tech 1:  I have to come up with some box specs to put on the site so we don't get bombarded with emails on what size to use.  I think I'll figure out, like, two different sizes...you know, give them options.

So with that bit of fantasy, I'm trying to prove that it doesn't make a whole lot of difference which you choose, and that there is no rhyme or reason to make the two-sub box slightly different than what you'd get if you just doubled the size yourself.  So much of a sub installation depends on quality of the build, integrity of the wiring, placement of the drivers, accoustics of the vehicle....etc...etc.

So you should just keep the things in mind that you've learned about placing subs, such as: 

• with multiple subs make sure they are firing in the same direction................
• all subs having the same impedance and phase...............
• all subs in identical air volumes...............
• all ports identical.......
• smaller enclosure if you have a lot of power to give them, larger enclosure if the power is meager.............stuff like that.

They're rated for 250, IIRC from looking at it earlier...so if you send them each a true 300 watts....they'll hit hard, alright!  Harder than you want them to, I suspect.  In a situation like that, where power exceeds the capability of the subs, I would seriously look at putting them in sealed enclosures.

Oh, and about that stuff above....you read the info a little wrong in that chart.  What they're doing is showing you options for box sizes with the vent dimensions figured for you, that's all.