Re: Bridge VS Neck.....basically what is the design difference ??
Awww, man! It hurts seeing so much speculation and assumption and so little actual knowledge and understanding about the laws of Physics.
The so-called "calibrated set" was born out of the necessity of balancing the output of the same p'up used in both the neck and the bridge position. The concept behind the solution to this "issue" was devised by eletrical engineers in the first place, but it took actual musicians with practical, hands-on knowledge to "fine tune" the actual solution to the issue. A guy named Seymour Duncan comes to mind (and Larry Di Marzio, meaning actually Steve Blucher as well, to be fair)... never heard of them, isn't it?
Gibson followed later with the 490R/498T aka the "dread set", solution created by completely tone-deaf engineers meeting the generation of baby boomers that used their eyes and wallets to judge tone. Which was a move that revealed itself to be be very lucrative... but it couldn't work forever. And the fact that Gibson is actually dying, this quote from Abraham Lincoln proved to be true: "You can fool all the people some of the time, and some of the people all the time, but you cannot fool all the people all the time"
AFAIK, the first real "calibrated" set on the market was the '59 set, fine-tuned by ear by you-know-who. But preceeding that, the most successful pairing of two different p'ups meant to be used as a set was the PAF Pro/Super Distortion by Di Marzio., followed by the Jazz/JB, which it actually is the most sold, even to this day.
Where's Frank Falbo when you need him?
/Peter