From their website:
This is the model originally designed for the neck position of the Ibanez® Universe. The neck position needed to be warm, but not too fat (nobody wants the low “B” sounding like a tuba, right?), so we scooped out some of the mids to brighten up the low notes and we kept the power down to a reasonable level to avoid unnecessary sludge.
The trend of the last several years has been to play 7-strings with massive overdrive. Taking the extreme low end of the seventh string into account, we've been recommending the Blaze™ Neck Model for the bridge position as well — where the lower output and tighter lows create better chord definition. The latest 7-strings Ibanez® has built for Korn have been equipped this way.

The pickup was originally in Ibanez Universe (see photo proof from DiMarzio tech support)