I ordered a set of BigRigs in P2 size for a project, but they took forever to arrive, so I ended up using different pickups for that bass. I ended up using the BigRigs in a couple other basses.
The bridge pickup was paired with the P-pickup in my Mike Dirnt bass. The bass has 3 push-pull pots for series-parallel switching for each pickup and when combined . I really like both the series and parallel tones of the BigRig in the bridge position, and it blends well with the P-pickup. I have a similar PJ-bass with a Big Single in the bridge position, but I like the BigRig more.
I installed the neck BigRig in a homemade Tele bass along with a Fender Super 55 split coil. The BigRig is closer to the neck than a standard P-pickup since I optimized the alignment of the pole-pieces. The bass has 3 push-pull pots for the BigRig series-parallel, then both pickups series-parallel, and then an inline capacitor on the bridge pickup (like a RIC). The tone of the BigRig in series gets a little heavy on the bass side, but it tames down when adding the bridge pickup. The BigRig in parallel sounds great on its own and combined with the bridge pickup.
If I had to hard wire the 2 coils of BigRigs, I would probably run series at the bridge and parallel at the neck.
I agree with other comments here about BigRigs playing nice with others and being careful with the alignment of the poles.
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