Robert8252 Posted November 20, 2011 Report Share Posted November 20, 2011 What sub or subs this time? Had my 12" in a 2.2 cube box net and over 45"s of port I think. It slammed. Very flat frequency responses. Think port length was around 35. Don't remember exactly. From what you posted and not actually knowing the sub it sounds like you're in the right direction. 2013 F150 Crew Cab Old Build Log Feedback 2013 F150 Equipment - Some Awesome Stereo Sound Making Stuff Link to comment Share on other sites More sharing options...
Blackedout Posted November 20, 2011 Report Share Posted November 20, 2011 Looking at my first post again... I think there might be a "middle range" so to speak. Look at 1/4 wave T lines. If done improperly, they can suck. If done properly they can get down. Best thing to do is give it a try. There are a lot of factors. Edit: Given that you're trying to put so much power to a single 12, I would probably stick to the 13-15 sq inches of port range. What are you trying to tune at? What is the peak Frequency of the mustang? Trunk Build Log Link to comment Share on other sites More sharing options...
Ecco 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. It was when you had the different length ports coming out of your box, and you eventually chopped them down to (I believe) 6" each, and you said it sounded better. That's what I was referring to. Link to comment Share on other sites More sharing options...
OrionStang Posted November 20, 2011 Author 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? What sub or subs this time? Had my 12" in a 2.2 cube box net and over 45"s of port I think. It slammed. Very flat frequency responses. Think port length was around 35. Don't remember exactly. From what you posted and not actually knowing the sub it sounds like you're in the right direction. The sub is a DC LVL 6. I won't know the specs of the sub until I get it and test it. Im happy with the port area(as a staring point) at 37". Regardless, the port will have only one bend. Looking at my first post again... I think there might be a "middle range" so to speak. Look at 1/4 wave T lines. If done improperly, they can suck. If done properly they can get down. Best thing to do is give it a try. There are a lot of factors. Edit: Given that you're trying to put so much power to a single 12, I would probably stick to the 13-15 sq inches of port range. What are you trying to tune at? What is the peak Frequency of the mustang? The cars best score was at 33hz with the last box(tuned to 31hz). I am shooting for >34 hz tuning for this one. The problem with your port area suggestion is this; the port is 12.5 tall, so to get 13-15, the port would only be 2-2.5" wide. Too skinny I think. SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
Robert8252 Posted November 20, 2011 Report Share Posted November 20, 2011 Well hell, level 6 I'd go ahead and jump into the 20 per range. 2013 F150 Crew Cab Old Build Log Feedback 2013 F150 Equipment - Some Awesome Stereo Sound Making Stuff Link to comment Share on other sites More sharing options...
OrionStang Posted November 20, 2011 Author Report Share Posted November 20, 2011 Well hell, level 6 I'd go ahead and jump into the 20 per range. LOL, that's what is making this hard. So many opinions. You say >20, Ray says 18, Blackedout says 13-15. Well, I guess it would be best to wait for the sub, get some t/s specs, then design the box. SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
Robert8252 Posted November 20, 2011 Report Share Posted November 20, 2011 I'd stick to 18-20. Just don't tune under 34. Low tuning and big ports just aren't something I would consider doing. 2013 F150 Crew Cab Old Build Log Feedback 2013 F150 Equipment - Some Awesome Stereo Sound Making Stuff Link to comment Share on other sites More sharing options...
OrionStang Posted November 20, 2011 Author Report Share Posted November 20, 2011 I'd stick to 18-20. Just don't tune under 34. Low tuning and big ports just aren't something I would consider doing. That's what I just sketched up, 2cubes exactly with 18.75" per cube tuned to 34. Port length is 37". SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
sqsux Posted November 20, 2011 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". when you said 36square inches in your first post i automatically assumed of port PER CUBE, sorry... how wide is the port? i'm sure you've already said it but i don't want to read through all these new posts.. if it's as wide as the box i would make it less wide, taller and shorter. also how stiff is the suspension on a level 6? everyone is telling you 18-20+ sq inches of port, and making it seem like that's fine to play low.. i don't know anything about the woofer but after 18sq inches per cube i start to worry about unloading on low notes... 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 lol at 36 per cube. The port is 3" wide and 12.5" high, facing back on the driver side. As for the subs suspension goes, I couldn't tell you. There's only a couple of them out there, and I am going to test it for t/s specs when I get it. SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
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