I have a pair of Mackie MR5 mk3 active speakers that dual task for mixing and bass guitar practice. I'm really missing feeling a bit more low end when playing. I usually throw on some headphones but it gets really tiring after a while. Am I better off upgrading to 6" or even 8" woofers like maybe some KRK Rokkit 6's, or adding a sub to my setup? Or even just get a cheap bass amp (rumble 40 or something like that) with a D.I. to play and monitor through. My room is 16x12 and my speakers are calibrated to 88db SPL for mixing but I usually mix much much quieter and check once in a while to stay on good terms with my neighbors. I'm definitely looking for a budget conscious solution here, any help is appreciated.