Need some help figuring this out...

[brandon_s0854 10+ year member]

x3 on reducing port area, but also do you have the ability to cut freqs around that area with an EQ?
Also you're in a diff vehicle, so response is different. Maybe your old box would have worked better in this vehicle...

I was using the old box in the new vehicle. I was basing how the old box sounded in the new vehicle to make a new box. I just overshot the difference and was amazed how big of a difference the small changes made. After listening to it for a few days, I think the tuning needs to be dropped about 5hz. And unfortunately, I don't have an EQ of any kind.

 

[duanebro 10+ year member]

I was using the old box in the new vehicle. I was basing how the old box sounded in the new vehicle to make a new box. I just overshot the difference and was amazed how big of a difference the small changes made. After listening to it for a few days, I think the tuning needs to be dropped about 5hz. And unfortunately, I don't have an EQ of any kind.

Sounds like you should be thinking about getting an eq. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[duanebro 10+ year member]

I had some extra time tonight so I ran the numbers:

The black line is the first box.

Red is the current box.

And green is my suggested design.

The specs used were provided by Audio Que. No break in and with alum. coils. In car response will be different from these of course, this is just to show the difference in the boxes. The subs do drop off very fast under tuning because they are a low Q design. So to get low these need to be tuned low. My suggested box is 2cf net tuned to 30hz. It will not be as loud, you are losing ~7db at 40hz. But the sound should be more even. Plus group delay and phase angle are affected by the lower tuning, this could make the system sound better. I say could because it might not have that much effect once installed.

I would try to use the current box as a test box to see what you like before building anything new.

FWIW using the peak as a reference, the current box is 12db down in the current box. //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif