This tweak made such a difference that I just have to share it.
I have my Studio Two's for what, eight months now I think. They came with the Motorola piezo and I later upgraded to Wayne's new Vifa replacement. That was a good decision, with no regrets. I posted a review if you care to search for it. But this new tweak, one I thought would most likely be marginally audible at best, has turned out to be unbelieveable (at least in my system). Ok, here it is. I replaced the inductors with .51 mH Solen 12 awg. Not cheap but well worth the investment.
The Technical Stuff; That drops the inductors dc resistance from .5 to .14 Ohms.
The Real World Stuff; On powering up my Bottlehead tube gear I heard a slight hum from the speakers that had previously been inaudible. A good indication of increased sensitivity from the woofer! But the proof is in the music. It's been a week now and my first impressions haven't diminished at all. I hear not a murky, fuzzy or bloated presentation but one that gives more substance to the midrange and heft to the bottom end. All of the detail and definition is there and nothing has been masked. Just a clean improvement. Ok, this is getting long so here's a link:
http://www.partsconnexion.com/catalog/inductors.html

PS - When I show these to the neighbors I no longer say they're a good speaker "for the money". They're just dang good.