[Mike P.]

Using WSinISD Pro this sub models to 55 liters tuned to 26hz. With manimum input power of 150 watts SPL is still 100 db at 23 hz without room gain. Xmax isn't exceeded untol 20hz. The use of a subsonic filter would be required for frquencies below 20 hz. When modelling subs for HT use, you can get more low end output with a bigger box and a lower tuning point at the expense of power handling. It's a trade off. Finding the "balance" of box size, tuning frequency and power handling for a specific sub for HT use is the challenge.