This is what it says about these pickups
here.
"In general, a pickup wired in series will have a fuller and fatter midrange with a subdued high end than a pickup wired in parallel, which will typically have more highs and a deeper low end with a cleaner midrange. Series pickups also have more output than parallel pickups.
Parallel pickups generally are a better choice for a split-able installation as there will not be the gain loss associated with series style pickups. "
That's what the manufacturers side says, anyways. Hopefully Nino will chime in here at some point; I know that he's done alot of these before. However, I only know that because I covet them with an almost perverse desire.
