[quote name='ccapital83']First of all thank you for doing that second the polk was in a ported tuned to 39hz. the port of the enclosure link is 12.5x2 and has no port noise at all. i just threw the sundown back in it still sounds the best of all to me. can I try adding a tiny bit of polyfill to smooth out the peaykness maybe it will drop the tune a tiny bit? before having another custom made? sounds like I want a tune between 37-40 from all ive gathered I deff hated the 35 and 36 It was to boomy when it dropped. One of the guys on here had suggested since I only use dubstep to stay under 1.25 cubic feet and do 38hz im starting to think he knew what he was talking about with the higher tune smaller enclosure because the polk was in a .87 cubic foot ported tuned to 39hz. its in my fiances car now sounds amazing.[/QUOTE]
I don't think Polyfill is going to work for what you desire. The idea behind polyfill is to make your box sound bigger. I don't think it eliminates the "boomy" sound either.
The guy recommending the smaller box volume and high tuning is right. That doesn't mean you end up with a small box however. I did some more playing with the Sundown, and it looks like .75 FT^3 tuned to 38Hz with a port size of 12X3 (
@Jeffdachef can you let me know if the Sundowns wants a port area that large or should it be more to the 24-30in^2?) is going to give you your flattest response, but still not as flat as the Polk. For that box however, you'll still looking at 13.5H X 31.5L X 13.5D. Port volume is 1.75 ft^3 which should kill any and all port noise.
Orange - Wifes current box (port isn't accurate, but it shouldn't change these ratings much)
Yellow - Your current box with the Sundown
Green - My recommended box for flatter response. Massive box despite a low chamber volume, just keep that in mind.
Box specs:
13.5 tall
31.5 long
13.5 deep
Port = 12 X 3 X 84.38
Tuned to 38 Hz
Chamber Volume = .75ft^3
Transfer Function Magnitude
SPL
In the end, your not really gaining much with the Sundown. You can try the polyfill, and please let me know how that goes, I've been considering that too with my prefab to cut down some port noise. Also, take what I say with a grain of salt. I'm a pretty smart guy, or at least I like to think so, and pick up on things quickly, but I'm also very new to this. I only did my first build at the beginning of the year and have been here and a few other forums soaking in all the knowledge I can.