I'm currently using a Sunn Concert Bass into an Orange OBC 410 It's not the best SS head, but it's cheap, loud, aggressive and eats pedals like a champ so I'm pretty happy with it. I've read a couple of times that the Concert Bass EQ is a fender-style tone stack and not a parametric EQ. I never had a Fender amp so I'm a bit puzzled by this. Also the few info I found online were a bit vague. Anyone has some insight into how this EQ works? I noticed that the MID control only slightly effects the sound, while bass and treble controls have a much stronger effect. Turning up the Treble control also boosts the overall volume a lot, bringin up the low-mids too. The bass controll doesn't seem to do the same. After turning the Treble control up, the Mid control has more effect on the sound. Any help would be really appreciated!