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P-90 pup balancing

 
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Tue Apr 05, 2016 6:24 am    Post subject: P-90 pup balancing Reply with quote

So my bridge pup is quite a bit lower in volume than the neck pup, though string heights above each are very close to identical.

before I start messing with adjusting pup heights - which is a hassle because the P-90s are mounted to the bottom of the cavity - would inadvertently swapping the wires cause lower volume?

I wouldn't think so, but thought I'd ask.

Any other wiring issue that could cause this?

Everything sounds good, they just aren't balanced.....
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BluesmanDave



Joined: 17 Nov 2008
Posts: 2816
Location: Sacramento CA

PostPosted: Tue Apr 05, 2016 8:16 am    Post subject: Reply with quote

Nothing to do with wiring, this one's pure physics. There's a reason why bridge pickups are either hotter or closer than neck pickups. Imagine how a guitar string moves when it's plucked from the side, like so:



The string moves a greater distance (and therefore creates more current) at the neck pickup position than it does at a bridge. Therefore, if you want the signals to be equal, you have to move the bridge pickup closer to the string (so the movement of a string creates more current) and the neck pickup further away from the string (so it produces less current).
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tnt



Joined: 14 May 2007
Posts: 2897
Location: Princeton, NJ

PostPosted: Tue Apr 05, 2016 9:24 am    Post subject: Reply with quote

BluesmanDave wrote:
Nothing to do with wiring, this one's pure physics. There's a reason why bridge pickups are either hotter or closer than neck pickups. Imagine how a guitar string moves when it's plucked from the side, like so:



The string moves a greater distance (and therefore creates more current) at the neck pickup position than it does at a bridge. Therefore, if you want the signals to be equal, you have to move the bridge pickup closer to the string (so the movement of a string creates more current) and the neck pickup further away from the string (so it produces less current).


Perfect - thanks!
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RolandR



Joined: 03 Sep 2003
Posts: 8908
Location: Coastal Calif.

PostPosted: Tue Apr 05, 2016 2:20 pm    Post subject: Reply with quote

What I experience with my guitars, the bridge pickups always have the weaker volume due to less string vibration sometimes even with a hotter bridge pickup compared to the neck pickup. I just accepted as it is.I don't lose sleep over it. Wink
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