Excellent, remove the bottom. When you lift it away, pay attention to
anything that might be attached behind it. Go slow and careful, just in
case.
Since this a ported cabinet, requirement for absolute, air tightness is
less of a concern than it would be for a sealed box. Not an unconcern,
but the box isn't pressurizing internally, such that the back pressure is
looking to escape through every pin hole, instead of out the 2 ports.
With that said, replacing the panel with the same integrity as you found
it, is desirable. DIY quality workmanship: tight, strong, and non
resonant.
Speaking of resonance, since you'll be in the belly of the beast, note
the quantity and quality of bracing and dampening material (if any). I
have had success smoothing out the response of entry level subs by
adding a little of both. Maybe you should make this the your next
improvement project, since you can pop off that panel anytime.
Bracing will make the box stronger, and less resonant, but a little
smaller. Sound dampening material absorbs reflections that can
bounce back, through the cone, and it actually makes the speaker
behave as if it were in a bigger box. You play these two off against
each other, until you get the best sound possible. Only if it's needed
though.
I'd like to know, what you see when you get inside. Primary objective is
evaluating the extrication of the x/over and visualing the (direct) path
from the speaker to the posts, where ever they are.
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