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As for swapping out drivers, you could do it, but you'll basically have to buy a steep electronic crossover (of high quality), or re-work the crossover between the new woofer and the old tweeter. A RTA will also help to make sure that levels are matched.As for port tuning, get the volume of the box from nOrh, the T/S parameters for your replacement woofers, and the unibox box modeling program. Plug in the diameter of your port and the T/S paramters for your woofer, and it will tell you how long your port needs to be for a given tuning.
Just get a sub, you're not going to be able to find a speaker for under $1k that gives you the type of bass that you want. With a good sub, you can adjust the level of bass to give you the type of impact you are looking for.
Crossing the sub at 120Hz and goosing the level seems to do the trick. But that doesn't make it right. That says to me the mains are not holding up their end of the bargain. The kick drums sound like they have been phoned in. It's incredibly thin even at high volumes.
Subs are supposed to fill in that very last octave. But instead they are prescibed to cure weak mains. That is what I don't want. I don't want to use a subwoofer as a band aid for poor performance mains. I don't like the acoustic separation of having the sub in the middle. I want a little bit more extension and a lot more amplitude in the bass that's all.