OrionStang Posted November 18, 2011 Report Share Posted November 18, 2011 Does a very long port affect the efficiency of a box design? For example. 2cuft box, 37sqin of port, but it is 36 inches long. Is that bad? SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
Ecco Posted November 18, 2011 Report Share Posted November 18, 2011 I think (don't quote me on this) that a long port like that reduces the sound quality (Fish Chris as an example)t. As far as efficiency goes, I don't believe so, but... I can't really say for sure. Link to comment Share on other sites More sharing options...
OrionStang Posted November 19, 2011 Author Report Share Posted November 19, 2011 bump SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
Quiet Posted November 19, 2011 Report Share Posted November 19, 2011 From what I understand if you have more inner wall surface in a port, it creates drag which will make it lose efficiency. Also, I read somewhere that long ports increase group delay which can increase the "muddiness" of the sound. Can someone back this up? I'm not 100% on this. 2007 Pacifica Rebuild. Less quiet. Still not loud. Link to comment Share on other sites More sharing options...
AmericanLegend Posted November 19, 2011 Report Share Posted November 19, 2011 36 inch port length is fine as long as its tuned where you want it. Link to comment Share on other sites More sharing options...
sqsux Posted November 19, 2011 Report Share Posted November 19, 2011 Why so much port? Sounds like a bad combo to me. Start out boxy, shape as you move along. Dc Audio Team Fur Link to comment Share on other sites More sharing options...
OrionStang Posted November 20, 2011 Author Report Share Posted November 20, 2011 Why so much port? Sounds like a bad combo to me. It would be better if you said WHY. 18sq in per cube isn't too bad. The width of the port is also a factor. Box is 14"H, so port is 12.5"H. I really don't want a slot port narrower than 3". SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
IH8PunkRok Posted November 20, 2011 Report Share Posted November 20, 2011 length isnt a problem so much as bending in my studies a port that does not bend is louder than one that does. mind you these are very limited studies though.. and as for the port thing.. personally i still think it is not enough but you really dont have enough box to keep a huge port tuned right so hopefully that will work. facing back it will sound tons better than forward so keep that in mind -Matt2005 Dodge Magnum RTJVC KD-AVX1 2 PPI S580.2 Obsidian Audio ST1 Horn Tweeters PRV 8MB450s Audio Legion 3500.1D 2 RE MT 18s 360 ah LiFePO4 BatterySHCA 2/0 155.2 @ 29 hzKicker CVR 15's buildDD 3512e buildMini T-Line Build(6) 8s BuildNightshade 15s Wall BuildMagnum AB XFL 12s BuildNewest Magnum Build Link to comment Share on other sites More sharing options...
Fish Chris Posted November 20, 2011 Report Share Posted November 20, 2011 Hey Gaming, I'm just curious as to why I (or my system) would be an example ? I think mine plays pretty darn loud and clear. Of course I'd like more... Wouldn't we all ? But anyway, I have three 6" dia ports, with a length of 30" each, for a tuning of around 31 hz, and again, I'm pretty happy with it. Would like to triple my power, but..... The only thing I'd do different next time, is to run a single, larger vent > but keep in mind, if I wanted to go with the same sq inches of port that I have now, that vent would also be 30" long. If I wanted to bump it up to say 30% more port area (for longer throw subs) the vent would probably jump to 45" ! And I believe, it would still sound perfectly fine, as long as it were tuned correctly.... But come to think about it, I believe somebody already said that.... So, I concur Peace, Fish I think (don't quote me on this) that a long port like that reduces the sound quality (Fish Chris as an example)t. As far as efficiency goes, I don't believe so, but... I can't really say for sure. Link to comment Share on other sites More sharing options...
Blackedout Posted November 20, 2011 Report Share Posted November 20, 2011 Longer port lowers the tuning. Lower tuning = less efficiency. So yes, your box could be potentially less efficient as far as numbers go. On the other hand, many SQ boxes are tuned pretty low. Low 30s upper 20s. Keep in mind that the FS of the subwoofer also plays a factor with port length/ tuning in terms of efficiency. What is your goal? Trunk Build Log Link to comment Share on other sites More sharing options...
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