As someone who has played bass guitar for 40 years now, I definitely prefer a lower mid bump, somewhere in the 250 hz range, and pretty much do not enjoy a built in upper mid range bump. I play mostly down at the nut, finger style Blues and RnB, and that lower mid bump really gives me that chunky type of pillow in the mix. What kills me is that, that 250 hz bump seems to differ from amp to amp, let alone from cab to cab. Right now, I'm using a Genz Benz Shuttle 6.2, and a Greenboy Bassic 15, with the Faital woofer. I don't know what the " built in " specs are for that particular rig , but a slight bump in the 250 -300 area gives me pretty much what I want.