Midbass 6" Enclosure Question

[Jeremy009]

Hey guys, hope all is well.
Am trying a small project for the headrests in my car. Its a compact ported headrest box (pic attached for reference). In there goes a faital pro 6fe300 midbass 6" and a silk dome.
Now after speaker displacement the box is 0.1 net with a port tuned to 155hz. The mounting depth of the speaker is 3" and the box is 3.5" which only leaves 0.5" for the pole vent of the speaker.
Am thinking to line ONLY the back of the box with dacron. Which is about 0.5" thick. What can happen here seeing that the pole vent may be partially up against the dacron? Also, will the tuning of the box drop a bit? Because thats the goal.
Do it or nahh lol thankss a mill

[djdilliodon]

Blocking the pole vent can lower the ability to cool the voice coil. If you are trying to shrink volume so tuning frequency will drop, you are better off gluing some small wood blocks to the sides, filling the sides with a fast set epoxy resins etc. 

[Joe X]

On 3/20/2022 at 8:53 AM, Jeremy009 said:

Hey guys, hope all is well.
Am trying a small project for the headrests in my car. Its a compact ported headrest box (pic attached for reference). In there goes a faital pro 6fe300 midbass 6" and a silk dome.
Now after speaker displacement the box is 0.1 net with a port tuned to 155hz. The mounting depth of the speaker is 3" and the box is 3.5" which only leaves 0.5" for the pole vent of the speaker.
Am thinking to line ONLY the back of the box with dacron. Which is about 0.5" thick. What can happen here seeing that the pole vent may be partially up against the dacron? Also, will the tuning of the box drop a bit? Because thats the goal.
Do it or nahh lol thankss a mill

 

 

Damping in a ported box make response slightly less peaky and may lose some output, that's about it.

 

That enclosure models very peaky at around 150Hz (white plot), this is what I get tuning lower to 90Hz on the same box size (yellow plot):

 

 

And here is a 0.2 net tuned to 85Hz box compared to what you have, you get much more low end extension (red plot):