Polyfill Ratio? Subthump Stealth + Alpine SWS-1043D?
10-26-2010, 11:29 PM
#1
TECH Apprentice
Thread Starter
Polyfill Ratio? Subthump Stealth + Alpine SWS-1043D? I just purchased my new setup. I'm taking the Monsoon amp & HU out and replacing it with a Sony CDX-GT740UI and Alpine PDX-5 and replacing 4 speakers. Please, no comments about how bad Sony is...they had the best UI and that was my #1 concern. I assumed any aftermarket would be better than stock, so I can't lose there!
ANYWAY...I did a little bit of research on products, but the entire world of car audio is new to me. I know some general concepts because I'm big into home theater, but I just found out today from a friend about "Polyfill" and cubic feet of the enclosures (in HT world, you just buy a brand name sub...period).
I bought the Subthump Stealth box which says 0.6 cubic feet volume, and Crutchfield says that the Alpine SWS-1043D has an ideal sealed box volume of 1 cubic foot.
The reason I got this sub is because of a friend's recommendation of Alpine, and a search finding that several people bought Alpine Type S subs in stealthboxes on this forum and had nothing but good things to say, but this 0.4 cubic feet deficiency is worrying me. Do I have anything to worry about?
Also, searching has found that the common ratio is 1lb Polyfill per cubic foot of volume. But how do I interpret this? My stealthbox is 0.6 cubic feet. Since the sub is optimal at 1 ft^3, should I fill it with 0.4 x 16oz = 6.4oz of Polyfill? Or do I have to take into account the volume taken up by the actual subwoofer cone?
Did I make a mistake buying this sub with too high of a volume requirement?
ANYWAY...I did a little bit of research on products, but the entire world of car audio is new to me. I know some general concepts because I'm big into home theater, but I just found out today from a friend about "Polyfill" and cubic feet of the enclosures (in HT world, you just buy a brand name sub...period).
I bought the Subthump Stealth box which says 0.6 cubic feet volume, and Crutchfield says that the Alpine SWS-1043D has an ideal sealed box volume of 1 cubic foot.
The reason I got this sub is because of a friend's recommendation of Alpine, and a search finding that several people bought Alpine Type S subs in stealthboxes on this forum and had nothing but good things to say, but this 0.4 cubic feet deficiency is worrying me. Do I have anything to worry about?
Also, searching has found that the common ratio is 1lb Polyfill per cubic foot of volume. But how do I interpret this? My stealthbox is 0.6 cubic feet. Since the sub is optimal at 1 ft^3, should I fill it with 0.4 x 16oz = 6.4oz of Polyfill? Or do I have to take into account the volume taken up by the actual subwoofer cone?
Did I make a mistake buying this sub with too high of a volume requirement?
