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[TheBassChild]

I have a T-Line subwoofer box in my car with a single 10" Soundstream T5 in it.
So far I am happy with the sound as it hits really nicly between 37 and 27hz. The lows are just insane.

What's troubling me is the fact that once its reaches around 40 to 45hz the bass response is so much weaker.
The main purpose of the T-Line is for the mass output of it.

Is there anyway I could tweak the box design to hit into the higher frequency so it has a broader range in bass when I listen to music?
I got the plans off a friend, but I do not know the tuning of the box. Ill through in the plans of the box below.

I would be willing to make a new box with a different port design. Or would it just be easier to make a sealed/ported box for it?
I'm sitting on the fence here with SPL and SQ. I chose the T-Line because it had a good mix of both. Is there maybe a different type of box I could build that would get me what I'm looking for?

Thanks