I bought these for a project, opened the boxes, looked at the wiring stuff, put them back into the box, and life got in the way, I never used them, and the guitar they were meant for is gone.
From DiMarzio:
We designed FRED® to bump the mid-range of the PAF Pro® EQ up a notch, but in the process, something unusual happened.
Harmonics that humbuckers usually don't reproduce started popping out, particularly with overdriven amps and distortion units.
FRED® has about the same power as the PAF Pro®, but the unusual overtones create a sound with more crank and growl.
Joe Satriani was the first player to discover and exploit these qualities, and it's been his main bridge pickup until the introduction of the Mo' Joe.
FRED® is really sensitive to changes in pick attack and control settings, and its distinctive tone makes a great recorded sound for both penetrating solos and tight rhythm tracks.
Recommended For Neck and bridge positions in all solid-body, hollow, and semi-hollow body guitars.
Wiring 4 Conductor
Magnet Alnico 5
Resistance 10.
38 Kohm