EMG's are low impedance and normally active (using their own pre). They have a very clean, neutral sound - The 9v EMGX system is in my Supersonic (with flats).
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I have the EMG Geezer Butler P-pu in my Glam P/J (passive) and it sounds more or less like a classic P-bass.
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I kept my EMG's that i replaced in my Non-Fender Jbass.
What i still like about them is exactly their neutral sound.
One day they may go into a bass i don't own yet.
Who knows what that bass would be anyway.