I've checked them out but I was looking at a comparison of tonal qualities more than anything else. They all have a summary which has some what helped. There's nothing more in depth eh (besides the manufacturers' website)?
Many preamp company sites post their frequencies and amount of boost. Pickup companies like Seymour Duncan and DiMarzio post tone comparisons of their pickups, and EMG posts some SPLs of some of their pickups.
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Originally Posted by McThumpenstein
I don't think the wife would buy the "I need to take off this knob and put a whole new bass under it" story.