One thing has stayed consistent throughout John Petrucci's long and successful career: the DiMarzio® pickups in his guitars. John has been pushing the envelope of progressive metal since the late eighties, and the DiMarzio® LiquiFire™ Neck Model, DiMarzio® Crunch Lab™ Bridge Model, DiMarzio® LiquiFire 7™ Neck Model and the Crunch Lab 7™ Bridge Model resulted from our most recent collaboration with John. He used them throughout Dream Theater's tenth studio album, "Black Clouds and Silver Linings" released June 23. 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. The sound John likes in the neck position of his 6-string translates very well to the 7-string, with fat highs and clean lows for smooth solos and tight bass lines. The LiquiFire 7™ isn't an exact duplicate of the 6-string version. The attack is a little more focused and the voicing is shifted down about 500Hz to bring out the sound of the seventh string. The Crunch Lab™ is noteworthy for what it doesn't do — it's not a screamer, and it's not about thundering lows. Its physical appearance is identical to the D Sonic™, but the internal design is a lot different. It's louder, and the highs have more depth. The lows and mids are more open, and this is crucial for playing chords with body and presence through a gained-out amp. The voicing of the pickup is also different enough to the point that John prefers the Crunch Lab™ to be installed in almost all of his guitars (including the JP Bari) with the solid bar toward the neck, regardless of the guitar's tuning. Also available in a 7-string version, The Crunch Lab 7™.