Here's my experience, please share yours! Peavey Millennium onboard 18v eq: 5/10 meh, drains battery fast DOD Bi-Fet Preamp: 5/10 meh Aphex Big Bottom: 6/10: kinda soft, doesn't help peaks BBE Maximizer also Tech21 Sansamp Character series: 5/10, okay live, too low for recording. (Other than the low end girth, the Tech 21 gets a 9/10 for tone.) Graphic/Parametric Eq: 6/10, never sounds quite right Digitech Dual-Band Bass Squeeze: 7/10: stay below 5 and works quite well; good for guitar too Behringer blendable Bass Overdrive (Boss ODB-3 clone): 8/10, quite good, better "shelving" curve than any circuit above, even better than a mixer-channel bass knob (see Behringer mixer). Behringer Xenyx mixer: 8/10, okay used just once, but go thru the fx loop with some limiting and add a 2nd channel's bass boost! Electro-Harmonix Knockout Eq: ?, I've used crossovers for years, to the point of wearing them out. Feedback on how well this records?