Hmm, a little larger than the ~10x12 I'm typing in and back when it had a Radio Shack DIY two way horn/'prosound' 15" woofer speaker system it was too much vented, but plugged up and against a wall was pretty good in ~5 ft^3, but the woofer had a low 20s Fs, higher Vas, Qts, than the 604, so wound up packing the vent with drinking straws [some just 'stick a sock' in it] and fine tune it using the 'click' test: Click test: Click Test | GM210 | Flickr
So; make it as big as you can, then tune to actual Fs [when it's pretty much stationary and all output is from the vent] and if it's 'boomy', fine tune with the 'click' test or impulse response if you're set up for measurements/testing.
GM
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