So I have a dilemma of sorts, New GK MB 500 is highlighting flaws in my speaker cabinets. Previous heads, Musicman 120B and Ashdown MiBass 2.0 sounded OK but lacked power for some of the new efforts I am supporting. I tested my new GK at GC with Mark Bass 4-10 and it sounded awesome Here's my current stable: 1] 35 year old Bag End single 15 oiled birch[i am original owner] with Bag End brand speaker... it's sounds just Ok but does sound tired. Do speakers just tire out? Bag End company is in my home town, thinking about taking it in there for suggestions. Wondering if a new modern driver will make it shine again, Cabinet is in good shape otherwise. 2] Newer Hartke Neo HD 112 recently bought from TB'er, Sounded OK with the old heads but now with GK shows annoying resonance with certain [Not All] lower notes [low B and down]. Unbearable as it currently is. 3 Harke 210 Transporter, sounded just OK with the previous heads but again having trouble with clarity on low notes. Obviously not a top tier cabinet, no love lost for this one. Thinking about getting new driver for Bag End and maybe the Hartke's [both] or maybe just dump the Hartkes and getting something portable like a good 210 or Epiphani Ultra Light 2-12 thats up for sale locally. I mostly play smaller venues but occasionally louder outdoor gigs so need some flexibility for the 500 watts I now have at hand. I'd like it to be an easy carry [i am 63 years young]. Like to keep it in the $500 range if possible. Thoughts and idea's welcomed.