I look at the centre about as fondly as I would any 1992 speaker - at the time, the buddy of mine would wind his own coils, he had books full of info on porting, cap values and coil winding. For all intents and purposes, it's every bit as good as what was commercially available.
But technology was a little different then - it was size of the box, porting diameter and depth for driver size. End stop.
It's kind of assumptuous to think a weekend warrior can build a better speaker than a speaker design company... that is, besides slapping a couple of 6x9s in a box for tailgate parties and such.
The most I've done since then with consumer stuff has been to replace drivers in my brother's bass cabinet and add a set of deck-mounted 6x9 3-ways to our old LeBaron.
Bren R.
