brent379 Posted January 12, 2015 Report Share Posted January 12, 2015 do you think it would be possible to use 3/4 of the xmax rating to figure minumum port area? Link to comment Share on other sites More sharing options...
alaskanzx5 Posted January 12, 2015 Author Report Share Posted January 12, 2015 Thanks for the help, learning a good bit here. Another question, If your comparing the same subs but different size (12" to 15" or 18") or even different subs all together would it make sense to assume a sub (or pair) that moved more air even though it's smaller could have a higher potential at being louder t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
brent379 Posted January 12, 2015 Report Share Posted January 12, 2015 i think the "louder" part is setup dependant. makes sense that one will get more output out of 2 10s setup properly with the right amount of port area/box volume then you will with 2 12s that dont have enough volume and port area. guess it also depends what the goal of the system is, want numbers or a daily. obviously depends on power also. so many factors involved its ridiculous lol Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted January 13, 2015 Report Share Posted January 13, 2015 Thanks for the help, learning a good bit here. Another question, If your comparing the same subs but different size (12" to 15" or 18") or even different subs all together would it make sense to assume a sub (or pair) that moved more air even though it's smaller could have a higher potential at being louder It's my understanding, and I could be wrong, but the sub with the larger Vd will get louder. However if you have two subs with equal Vd, one will larger cone area but less Xmax and the other with the opposite the one with more cone area will use less power to get the same SPL. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
alaskanzx5 Posted January 13, 2015 Author Report Share Posted January 13, 2015 ^ Thanks. That was exactly what my theory was behind it. Of course that is with an optimal box for each different setup. Example 1. 2 12" with 4000cc of vd 2. 2 15" with 3000cc of vd Option once could potential be louder breccias it dies move more air but only if drying to xmax to reach the full vd potential. If not able to reach full xmax then option 2 could be the better contender. t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
kirill007 Posted January 13, 2015 Report Share Posted January 13, 2015 Thanks for the help, learning a good bit here. Another question, If your comparing the same subs but different size (12" to 15" or 18") or even different subs all together would it make sense to assume a sub (or pair) that moved more air even though it's smaller could have a higher potential at being louder It has the potential indeed, doesn't mean that that will happen. If it's in a ported box, chances are it won't reach xmax at/around the port tuning which is where the peak is. Thinking is the root of all problems... You ALWAYS get what you pay for. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted January 13, 2015 Report Share Posted January 13, 2015 It has the potential indeed, doesn't mean that that will happen. If it's in a ported box, chances are it won't reach xmax at/around the port tuning which is where the peak is. Kirill007 brings up a good point. With the Xmax subs have these days you are probably going to run out power handling capability before you run out of mechanical travel. This kinda makes Xmax and thus, Vd irrelevant once you reach a certain point. Another thing to consider is subs with higher Xmax and power handling capability are generally less efficient (due to higher moving mass, less windings in the gap, etc). "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Joe X Posted January 13, 2015 Report Share Posted January 13, 2015 do you think it would be possible to use 3/4 of the xmax rating to figure minimum port area? Not a safe assumption, it's really application dependent, in a SQ system you want to be nowhere near Xmax (specially as is usually measured - 70% BL ), next guy is going to want to push thermal and mechanical limits to near blow out conditions likely the 3/4 Xmax idea won't be suitable for him. Link to comment Share on other sites More sharing options...
brent379 Posted January 13, 2015 Report Share Posted January 13, 2015 ^^^ thats understandable joe. porting can be such a pain in the ass lol Link to comment Share on other sites More sharing options...
kirill007 Posted January 13, 2015 Report Share Posted January 13, 2015 Just input the data Winisd and you can see if with your amount of power/tuning/subwoofer the port is correctly sized. No guessing needed. Thinking is the root of all problems... You ALWAYS get what you pay for. Link to comment Share on other sites More sharing options...
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