From my high-end audio days...we always used to tighten all the driver screws on any speaker before using it. You'd be surprised how loose the woofers and tweeters were on new speakers. It made a big difference to the clarity of sound. In fact, we recommended this as part of regular maintenance. It would often revitalize a high-performance system that lost its edge (there's more we'd recommend too, but I'll stay with my loose screws for now.) I just got some new Epi UL speakers. Of course, I opened them up first and tightened all the screws (don't overdo them - especially with these poplar plywood cabinets!) The looseness of the screws on the 112UL was silly - I got several full turns on some screws. Be sure to pull the grills off by grabbing onto the loosened screw heads - don't pry out a grill. My question is this - I never really listen to my cabinets with loose screws, so I can't compare - I always tighten when the cabinets arrive. If any of you players out there decide to do a tightening and notice a difference, please post it. It'll be interesting to know. Remember...nothing loosens screws like deep bass; and a loose driver looses energy to unwanted vibrations.