The D Activator neck and bridge model were designed to use coils tuned to different frequencies. The idea is to shift the resonant point of the pickup to the frequencies of the harmonics that you want to accentuate from the guitar.and they respond instantly to hard or light pick attack. The sound is powerful, clean, and open, with excellent harmonic overtones and very tight lows. The best way to describe the D Activator neck pickup is that it is big, bright and open sounding with surprising string-to-string balance. The bridge has an enriched harmonic quality and the notes want to sing.