"I recently lined the cabinets on my IM's and that did help with the bass.The factory soundproofing is definitely lacking. Perhaps internal bracing would help also. Room tweeks will be soon, as the rebuild project is almost done."
I heard the Impact monitors with solid state and tube gear.in a second system .The bass was a mess IMO,no control or very little.I initially thought poor cabinet engineering ( or lack of )was the issue,Also thought possibly bad crossover deign after trying the standard things we all do in a room .This information i'm passing to the owner as he is scratching his head and has ran out of ideas,maybe with re-bracing(adding bracing as suggested) / relining the cabinets,and crossover upgrades he might get what he's seeking.Thanks for the info.