Airportsyndrome, I actually have them in pin-point configuration( 2 back one front) and noticed a difference in imaging mostly. It tightened the bass up and seems more controlled. The thing is I have a Hifi Pyon 1.5 inch thick Parkawood platform with resonance controlling feet with bearings and I put the migs under sub and top platform. I might try another set under platform and top carpet and take off feet.
Also I might switch to 2 migs in front / one back as the 13.5 driver and magnet weigh more than rear. My subs weight is 155lbs. Try lifting that yourself and place migs under(lol). Good thing I workout..
I think Ted D. mentioned larger miggs coming out ..
Regards Bacardi