I have a cabinet designed like the Acoustic 360/361, but it uses a rear firing 12" speaker instead of an 18". I am looking to install a new speaker and would appreciate any suggestions. I will be driving the cabinet with an Eden WT-405. Style is mostly classic rock and blues, using either a Fender Jazz bass or Ampeg Plexi re-issue. The band is pretty loud, but I'd like to just use the one cabinet. Thanks for any ideas!