This is just a ported box. Not a T-line.
The box didn't have a clear coat on it until now which I am about to post.
There is no port noise at all or distortion. The owner only has 400 watts on it now. It gets down to business too with just 400 watts.
Man, next time I will subtract 2 inches from people's measurements. lol. It was close as hell and convertible space FTL.
Want an SPL meter for a lot less than the cost of a Termlab, but just as accurate and has more features and more support? PM me.