Box design

[x1999]

Hi everyone!
I`m going to build whole new subwoofer system, I already have an amplifier and I have ordered the sub (DD audio 712f), and now i have to make the box for it. Thing is few boxes i have made have mainly been SQ boxes and other few I have made have been full SPL type boxes.Sub i had while back was in SQ box, I loved the kick and nice smooth bass, but it wasn`t loud or deep at all, last box I had was oversized SPL box, that rattled body panels like crazy, but then I was missing a bass that kicks nicely. So I thought I`d give SQL box a try but i have never made one before, so I thought maybe someone with more experience and knowledge could look over my box design and recommend some changes if needed.Friend of mine recommended website called subbox.pro, so that`s where I made the box design.(If that makes a difference, I mostly listen to music at full volume that my system can supply, and music that i listen differs very much, from dnb to heavy metal, so pretty much everything all around)

https://subbox.pro/en/b/HRYOQu95a
( Actual net. box volume is going to be around 65 liters, not 70.2 like in the design, I`m going to add corner pieces and also double front baffle, so I added some panel worth of extra volume)

[EricM9104]

The port is a little on the large side(just slightly though), but looks okay for the most part.

[x1999]

Allright cool, but what do I gain if narrowing the port? or what do I loose if I keep it the same in terms of SQL type of goal?
I have pretty much always used rather wide ports when building boxes.