Through research, I've gained the knowledge of mid frequencies and unarrested standing waves creating unwanted "boomy" overtones. I recently built two cabs to these specs. http://www.eminence.com/pdf/Basslite_S2012_cab.pdf I lined the 5 interior walls between the bracing with 1" foam. Since I'm still experiencing boom at moderate volume, should I add a bit more lining to the cabs? I think I have some egg crate mattress topper around here, I was thinking that I could fix the sound with that.