Well, the guy who reviewed this speaker was pretty adamnant that it was rare FOR a speaker under 1000 dollars to have a true phase plugs. (BTW, this review was of the EMP E5ti). Exact quote from the article
"There are two 6.5″ poly-matrix woofers, a 5.25″ aluminized poly-matrix midrange (with a true phase plug), and a 1″ fabric dome tweeter under a dedicated screen. The driver compliment alone belies the price of these speakers. Usually, at sub-$1000, phase plugs are for show only and move in and out with the driver. This, however, was a real phase plug. "
Okay, Bill knows his stuff, so lets rephrase the question- What is a pole piece extension and what it means in terms of sound quality?