This is the John Petrucci signature LiquiFire humbucker from DiMarzio. Since the mid 1990s, John's neck pickup sound has been based on either the standard Air Norton or the custom version in his Ernie Ball guitars. The LiquiFire has several significant differences. Its treble response is warmer and smoother while bass response is tighter and brighter. The total sound has a more focused voice which works equally well for highly overdriven solos and complex, clean chords.
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