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Old 04-08-2007, 12:20 PM
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Phase issues

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Hey all,

I did a search for this already, bt I'm either bad at searching or just stupid.

I have a bass I'm building, in which I have a Basslines MM pup at the bridge and a Bartolini split-coil J at the neck. These run into either an Aguilar OBP-1 and then through a passive tone control, or just through the tone control. I originally had a blend pot in it, but I started having phase issues, so I swapped it for another volume control, but the issues are still there.

Basically, there are certain spots that the pickups sound really quiet and hollow- out of phase, I assume. With the blend knob, it happened when the pot was favoring the neck pup, probably about 75/25 if I were to guess. If it were either pickup by themself, or favoring the bridge pup, it was fine. Even right in the middle was good. Now, with the vvt setup, if I have both pickups on full, it still happens. If I back off either pickup, it goes back to normal. There also seem to be other, random places in the travel of the pot where it tends to sound out of phase. I'm really baffled, and wondering if it's the pickups, the pots, my wiring, etc. Can anyone set me straight?

Nick
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Old 04-08-2007, 04:21 PM
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Have you tried reversing the polarity of one of the pickups? They might be wound differently requiring you to wire one pickup in reverse to make them sound "normal" when at the same volume. There are some threads in here with more detail on the subject.
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