Howdy all! I've finished my 4x12+tweeter cabinet.. roughly modeled after the Aguilar Papa 412 It's loud and low - not rock club loud but more than loud enough for the music I play out(either swing or Pat Methany style jazz - no active rock band atm ) I built it to play down to a low F# (normal jazz/performance volumes, not club volumes) and it's tuned as such (slot port at the bottom). 11?-15? birch plywood: front baffle is 15 I guesstimate, never bothered to count. Pine butt joints (I was concerned about the strength of pine - worked wonderfully). It's also extremely lightweight (yet solid) - right around 70lbs. My last speaker project 6x10 was ~ 140lbs and. I'm still working on the front speaker grill. 8ohm 12s are some older Madison Knights (http://www.madisonspeakers.com) 4" tweeter also by Madison all electronics from PartsExpress 2 speakon connections, 14ga(iirc) speaker cable tilt-back castors, handles are located on the top/bottom of the cabinet (not visible) ~ 10lbs of poly/fiber-fil (local craft store) pleather wrap around covering total height ~ 52" tall, 21" wide, 16" deep I absolutely love the sound. I'll be taking it with me tonight to band practice so I'll report on it's performance.