| The 2.5 cubes recommendation is sealed. If you're wanting to go with a ported design, look at 4-5 cubes tuned anywhere <= 32 Hz.
Sealed typically pairs better with your vehicle's transfer function; going ported will result in much more low frequency output, but potentially with disappointing transient response. This can managed quite nicely by EQ'ing the bottom end down a bit (if your HU can do so).
__________________ Neil |