"The LP Sig the same especially because that is not a solid block of wood running through the middle. The EB's were obviously turning/fading out by then and they were just an afterthought from what i can tell."
That is why the LP Sig is so resonant and a one-of-a-kind semihollow. No ruining sustain block to speak of. In fact, the LP Sig (and the Epi JC following it too, though my Epi fails to even remotely capture the resonance of the Gibson original as its top sounds dead), have a "T-block" in the body, with the "bar" of the T being located at the neck (and thus giving stability) while the "trunk" of the block passes through the body to the back. However, the "trunk" with its scarcely 1/2" height is much lower than the "bar". All it does is probably stiffen the back while the top is allowed to resonate freely. Both EB 2s, EB-650s and EB-750s have huge solid sustain blocks in comparison which are not made of balsa either (which would have preserved some of the resonance), but rockhard maple. In effect, it turns them into solidbodies with just a touch of hollowbody. Played unplugged, an LP Sig sounds louder and more acoustic than any of them even though the EB-650/750 have much larger and thicker bodies. (Except that they are filled to the rim with dead maple.)
I know they did this to combat feedback in the past, but in this day and age of small bass amps that are incredibly present, in-ear-momitoring, micro-equing etc, feedback protection isn't much of an issue anymore and can be combatted by other means. And I always thought that the word "sustain block" was an euphemism. Sure it adds some sustain on the high notes of a, say, ES, but on EBs stability and feedback-averseness were the key issues to implant it, not sustain enhancement.
