Modify port enclosure

[Manu]

Hello, i have an Hifonics MXs 12D2, using the original enclosure. I don't like how it sounds below 35hz, i have a small trunk, i don't want to change the enclosure. I want to ask you if i can get a better tuning, trying to modify the port. What i can do with it? Make it longer? This is my box https://ibb.co/9qfDvy9

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[chillin 10+ year member]

Have you tried moving it around in the trunk? Pointing it in different directions?

 

[Manu]

Have you tried moving it around in the trunk? Pointing it in different directions?

I tried, not very different results. My subwoofer sounds good around 40 45hz, i want to feel the bass better below 35hz, to be more shaky.

 

[Buck 5,000+ posts]

You could try to make the port longer, but there might be other reasons with the box won't extend lower, or even the sub. You'd have to reverse engineer the net airspace and tuning of the box and go from there.