Any suggested changes?

[Joel114]

I am going to be installing this Sundown E-10 V3 with this Rockford Fosgate R500X1D amp in the custom ported box in the picture tuned to ~33hz with 1.2 ft^3 internal volume (not including sub, port, ect) in the trunk of my 2005 Pontiac Sunfire. The amp will be fed with 4 awg thhn or eb flex with this 150 amp fuse leading to the amp and then 10 awg stranded thhn to the sub. Is there anything I am missing or should change? Also what would people recommend that the LPF hertz be set to? 150hz?

[ckeeler11]

What are specs on the box? Port area and length?

 

Low pass will depend on the front stage. I fyou have basic speakers with no sounddeadening you will probably be around 100 if you have decent speakers and deadening will be lower. 

[Joel114]

5 hours ago, ckeeler11 said:

What are specs on the box? Port area and length?

 

Low pass will depend on the front stage. I fyou have basic speakers with no sounddeadening you will probably be around 100 if you have decent speakers and deadening will be lower. 

External Height: 12"

External Width: 21"

External Depth: 16"

 

Internal Volume (excluding sub, port, ect.): 1.22ft^3

Port area: 15.75in^2 (1.5" x 10.5")

Port Center Length: 28"

 

The actual tune would be closer to 33hz

[Joe X]

Inside a car the response will be peakier than what WinISD shows, something  closer to the plot  below, part of the reason is that you picked a larger than recommended net volume:

 

 

Other than that it looks fine as long as you use your subsonic filter and don't push too much power. 

[Joel114]

12 hours ago, Joe X said:

Inside a car the response will be peakier than what WinISD shows, something  closer to the plot  below, part of the reason is that you picked a larger than recommended net volume:

 

 

Other than that it looks fine as long as you use your subsonic filter and don't push too much power. 

What about this one I made? Would it work better?

 

Box Specs:

External Height: 12"

External Width: 20"

External Depth: 16"

Frequency: 32.2 Hz

Internal Volume (excluding sub, port, ect.): 1.02ft^3

Port area: 15.75in^2 (1.5" x 10.5")

Port Center Length: 37.5"

 

[Joe X]

Lots of turns in the port is not recommended, I guess it's no big deal anyways but just saying, if you want to have less turns use just the necessary port area as determined by the manufacturer, tune a little higher (1 Hz difference will not be audible) and maybe do the box a little wider.

[Joel114]

5 hours ago, Joe X said:

Lots of turns in the port is not recommended, I guess it's no big deal anyways but just saying, if you want to have less turns use just the necessary port area as determined by the manufacturer, tune a little higher (1 Hz difference will not be audible) and maybe do the box a little wider.

Would it just be better to take the port area down to 13in^2 (1.25 x 10.5) instead of the recommended 16in^2?

[Joe X]

Here's a suggestion if you want to keep 1 net, it has 15 square inches of port area and a 33Hz tuning, differences should not be audible from your original spec,  the second turn is a 90 deg turn not 180 deg so it may be more efficient.

If you don't mind going above 1 net maybe your first box would be best.