I'm planning a build that's all about getting the most low, clear tone possible. Fanned fret - 40.5" to 38". I'm looking for a full frequency pickup for both neck and bridge position to get the most fundamental-laden, piano-like tone. The pickups will be angled to follow the fan and I've calculated that with a rectangular pickup, lengths will need to be around 119mm (4.7in) at the bridge. Less so in the neck position. Consequently, I'm looking at QTuners. What are your experiences with the QTuners, either with or without an active, on-board preamp?