Dynamat inside Box?

I was thinking about the affect it would have if i built a ported box and had the inside walls covered with dynamat. any thoughts or comments is greatly appreciated.

it helps but unless you have extra i would not waste my money or if you bought the bulk one and had extra.

if you are particularily concerned with back-wave distortion, then it will help. I wouldn't bother, even if you have a "cube" enclosure.

o ok, thanks