It shouldn't be a problem, just model it in WinISD and see what you can expect.
There are several dual driver sonotube builds (one either end) so its all down to the modelling.
Looking forward to your build pics if you go ahead.
What do you instead for program material? I'm looking into taking advantage of the Shiva sale, which puts the driver only $15-20 more than the Titanic. I think it has greater xmax, which may be better for HT. If you're sealed, you can go small. I'm looking at building a music-only ported sonosub, which will only add ~$10 to the build cost for the port (also on sale with DIY cable). If you're going for HT use and go ported, it needs a larger tube than I'm getting (4ft^3 gross, 14"x48"), but hey-the price is right $9 and I only need it for music. I'd like to see your project, and as Mike P would say- take plenty of pics!:bigsmile: