RAM_Designs 5,000+ posts
SketchUp Master
Agreed. Except 25in^2 of port per ft^3 would be 125in^2...I use around 20in^2 myself as that generally makes port length not too terribly long.Go 1 cube sealed, 1.25 ported, 25in^ of port at 47hz per sub. If you were doing 4 12s, it would be 4 sealed, 5 ported, with 100in^ of port for example.