Advanced apologies for the long post
My current rig sounds great, but I feel it lacks "rumble". It can get bassy, but I just don't feel the impact of the notes below G in drop D tuning. I mainly play Jazz style basses, but I notice it with my P basses as well. Band is a 4 piece with a loud drummer, one 100w head/4x12 lead/rhythm guitar, and one 50w/2x12 rhythm guitar. Rehearsal space is small, we are loud.
I have a couple ideas/theories:
1: Less perceived "push" from a rear ported cab(Aggie DB412)? The back is about 6-8" from the wall, should be enough room, right?
2: I'm reaching the limits of my amplifier(Markbass SD800 and RBI). With or without the RBI, running everything flat, boosting bass on either the RBI or amp, increasing the master volume anywhere past 12 o'clock isn't really adding anything.
I'm going for tones like this
http://www.youtube.com/watch?v=T4ZFN3D4-8s at the 1:00 mark, or
http://www.youtube.com/watch?v=YbUGbBNZ3nk. Warm a full, but still some mid range grind.
My gut is telling me to ditch the Markbass/RBI and get an SVT, maybe some 15's. Any thoughts, tips or suggestions? I'm all for trying stuff with my rig!