Qpower 3 Hole 12" Sealed Heavy Duty (hd123hole)

keep in mind, this box is built ok, however, the box should of had a better carpet that would stick.... plus, you can damage the corners if you drop it or during shipping.... thus, the corners start to fall apart... the internal bracing is good, but there are signs of air leakage if you do not completely seal the internal joints... my plans is to convert this box into a two way speaker system, i will modify the internal with plywood, wood glue, construction glue and screws... thus, removing the carpet and replacing it with better grade quality carpet... adding internal crossovers and speaker tube ports each chamber for the system... and you have 3 sets of two way speaker system in one box... overall, this is a good box, but the manufacture should of designed it a little better.... i would rate it at 3 to 4 stars quality, and 4 stars for design....