Pickup proximity questions

[RBrownBass]

I have a Godin P/J 5 that I want to rout for an MM in the sweetspot (a pickguard will cover what's left of the J rout, or I may have that rout covered completely and then have it routed).

Godin placed the P about 1/4" closer to the neck than you'd see on typical split-coil basses, so the MM will fit with no problems so long as I eliminate the rear wall behind the D/G coils of the P pup. But I'm concerned about the magnets from different pickups being too close to one another- I've read here that the sound can be negatively altered when magnets from different pups are too close to each other. Should I worry?

I've seen basses with EMGs and other epoxy-filled soapbar pups right next to one another, but most MMs (will be either a white Delano or a black Nordstrand, depending on my body color choice) aren't EMG-style pups. You turn 'em over, you can see the coils/magnets/polepieces.

Thanks for any help anyone here can give!

[RBrownBass]

bump

What I'm talking about is magnetic inteference. Anyone?

[Jay2U]

No, I shouldn't worry.
1) Magnetic field strength decays quadratically with distance.
2) The magnets in pickups have a direction, the fields point towards the strings.

Keep on playing subsonically!

[SGD Lutherie]

Doesn't matter. Look how close the two coils are in a Music Man pickup.

[RBrownBass]

Originally Posted by Jay2U

No, I shouldn't worry.
1) Magnetic field strength decays quadratically with distance.
2) The magnets in pickups have a direction, the fields point towards the strings.

Keep on playing subsonically!

Originally Posted by SGD Lutherie

Doesn't matter. Look how close the two coils are in a Music Man pickup.

Thanks for the replies. I'll take this advice, but I do still want to know why people think (and say here on TB) that it happens?

Just to make sure you both understand what I'm thinking of doing... I want to use both the P and the MM in their usual positions (or, in the case of the P, as close to the usual position as possible) and they will be about 3mm apart, with no wood between the front edge of the MM and the rear edge of the D/G coil of the P.

Again, thanks!

[Domespeed]

I have a Bass with that exact configuration - in fact, the two PUs are actually "back to back" with zero distance.
No issues at all, the P sounds like a P, the MM like an MM.