Quoted from Quench:
Nothing really, but what exactly do you gain? Is there some Williams service bulletins explaining the benefits of parallel connected flipper coils?
Nope, nothing other than Williams' patent/marketing hype I guess. People do seem to like to change WMS series wound coils to parallel though and they swear it makes a difference? I usually do it only because I don't feel like having several types of coils around and I usually convert the older 2 piece base flipper coils to the wpc/system 11 style.