Well, actually that wasn't what I meant, and I should have been clearer. I meant that plain old passive pickups vary in impedance (that right?), so bypassing the pre in various active basses is gonna present different impedances to the compressor, and they'll be more or less prone to picking up the noise.
Sure, but my point was essentially that the active preamp overrides the pickups, regardless of pickup impedance... when the bass is in active mode, of course. I don't believe that any passive pickups will have impedance as low as active, but I'm not certain.
Usual disclaimer: IANA tech.
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