Bass is very omni-directional...
And more to the point, you are operating the sub at frequencies well below the "transfer function" point.
What that means is, a wavelength won't even fit in your interior, by definition of length...
So, effectively the entire interior is being pressurized/depressurized simultaniously as the sub does it's thing.
So that should rule out location... it's not like having a higher-midrange that is locatable. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
So one school of thought will argue that it won't make much difference where you put it.
Another school of thought would argue that symmetrically located is best (ie. the middle, for a single), because there are still reflective opportunities for cancellation...
But even at that, you're talking about reflected energy cancelling primary energy. Not as damaging, even if it did occur.
I'd personally feel pretty comfortable telling you 'put it in the most convenient spot'...
But the BEST way to do it would be to build a test box... doesn't even need to be the sub you are using...
And try different locations out.
Wherever the test sub sounds best, the real sub will also sound best. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif