im going to be making the box for my p3 15 when i get it and im going to go with a 3 or 4Ft sealed box i was wondering if it would sound good or help with vibrations of the box if i covered the inside of the box with dynamat? .... also with the box itself i was down at lowes looking at some wood and the guy that was helping me asked what i was using the wood for and i told him and he said that it would be good to use this 3 quarter inch Fiberwood for the box and for the front face part of the box (the part where i mount the sub) to use 3quarter inch particleboard i wasnt sure how it would sound... but the guy said he has 2 15's and thats what he did and it was really loud soo anybody have any opinions,suggestions, or advice? thanks
--Faded
Replies (8)
uochronos on 11/16/2004 02:28:26
use 3/4 inch MDF partical board for the whole box. MDF is far superior to fiber board. MDF is basicaly saw dust pressed together at extremly high preasure similar to other compressed boards but medium density Fiber board MDF is the best stuff for the job. other boards look like compressed wood ships etc but MDF is all one solid color pretty much and looks solid. this is the best option
Second Dynamat is a deadening material... are you trying to deaden 3/4 inch MDF? doesnt get much deader then it already is hehe. adding poly fill to the bottome of the box can help with the sound. but dynamat would be a waste of money pretty much.
Chronos
Faded on 11/16/2004 02:33:14
ok thanks man
Faded on 11/16/2004 02:46:11
so with a 15 a sealed box would be a good option? rather than a ported box? cuz im stuck with a decision here and im not sure what to go with i know a ported box would be louder but ive have sealed boxes since i started driving and i havent heared very many ported systems ive sat in a car with a ported box with a 15 but it was tuned super low he said so it doesnt sound good on most songs but i dunno but im i guess a bass head whatever is louder but i was told that a sealedbox can be louder if its big enough but ive also been told ported boxes are way louder so i dont know!! lol maybe this topic should have been "Sealed VRS Ported!"
im going to have the sub facing me if that changes anything
uochronos on 11/16/2004 02:50:10
ported well with the same sub well always be a bit louder then sealed.
also a properly tuned and built ported enclosure can hit all frequencies well. usualy. Powerlifter knows more then me. but i have been designing a ported box on winISD for my alpineas and it has a flat response all the way from a little above tuning frequency to 90hz where its cut off. but it well act a bit differnt int he car but should hit frequencies well above port tuning frequency..
the thing is if you tune the box too high say 45hz you wont hear anything below that..
ported boxes tend to be sloppier sounding and less cone control. where sealed tend to be tighter and quicker responding. but the choice is yours.
Chronos
Faded on 11/16/2004 02:56:49
whats winISD? is it like a box program?
Faded on 11/16/2004 02:58:40
And me being completely new to box making.. how do you tune the boxes to a certain say like 28hz cuz thats what the p3's suggested tuning is
uochronos on 11/16/2004 03:19:59
tuning the box is done by port length and diameter usualy companies show the dimensions of the port they suggest. however using the parameters of your sub you can find out exactly how big to make it for any frequency.
winISD is a program for plotting the frequency response of a sub and box.
it can be downloaded for free if you do a google search for it.
Chronos
P0werLifter on 11/16/2004 15:10:49
When it comes down to comparing Sealed and Ported enclosures, it mainly comes down to personal preferance. Sealed enclosures provide good punchy clean bass, but lack the low end ported gives you. Now, ported on the other hand, if built, and tuned correctly can still provide good punchy clean bass, and give you the real deep lows (25-40hz) us bassheads love, not to mension they provide more SPL output than sealed enclosures. BUT, if a ported enclosure is not built properly, it can sound like crap (sloppy bass response, muddy, in general,,,,crap). This is why more math, and making sure you get everythnig correct is a must when building ported enclosures.
Tuning in an enclosure, like chronos has stated above, is done using the Height, Width, and Legnth of a slot port,
or using the diameter and length of a circle port.
The lower the frequency you wish to tune to, the longer the port will be (and the more displacment it will have). Vice versa, the higher the tuning frequency, the shorter the port. Theres many different factors that go into tuning the enclosure such as, port area, port with and height, total internal cubic feet of the enclosure etc.
For simplicity i have plugged in the equation into microsoft excel and all you have to do, is add in the viariables it requires from the enclosure you are designing, and it will give you the length of the port in order to tune to that frequency.
If you would like, I can send it to you via e mail or yahoo msger, or if you would like, i can play around and design you an enclosure per the specs of your sub, and the space you have in the cab for the enclosure. But id reccomend giving it a shot yourself first (good learning experience).
Well i think this as pretty long drawn out post, and ive probly repeated myself many times so im gonna end it there for now GRIN, Hopse this helps ya out.
BTW, the forumla is in our DIY here
http://www.clubknowledge.com/Car_Audio_FAQ/?t16
-Jason HAPPY
--Faded
Replies (8)
uochronos on 11/16/2004 02:28:26
use 3/4 inch MDF partical board for the whole box. MDF is far superior to fiber board. MDF is basicaly saw dust pressed together at extremly high preasure similar to other compressed boards but medium density Fiber board MDF is the best stuff for the job. other boards look like compressed wood ships etc but MDF is all one solid color pretty much and looks solid. this is the best option
Second Dynamat is a deadening material... are you trying to deaden 3/4 inch MDF? doesnt get much deader then it already is hehe. adding poly fill to the bottome of the box can help with the sound. but dynamat would be a waste of money pretty much.
Chronos
Faded on 11/16/2004 02:33:14
ok thanks man
Faded on 11/16/2004 02:46:11
so with a 15 a sealed box would be a good option? rather than a ported box? cuz im stuck with a decision here and im not sure what to go with i know a ported box would be louder but ive have sealed boxes since i started driving and i havent heared very many ported systems ive sat in a car with a ported box with a 15 but it was tuned super low he said so it doesnt sound good on most songs but i dunno but im i guess a bass head whatever is louder but i was told that a sealedbox can be louder if its big enough but ive also been told ported boxes are way louder so i dont know!! lol maybe this topic should have been "Sealed VRS Ported!"
im going to have the sub facing me if that changes anything
uochronos on 11/16/2004 02:50:10
ported well with the same sub well always be a bit louder then sealed.
also a properly tuned and built ported enclosure can hit all frequencies well. usualy. Powerlifter knows more then me. but i have been designing a ported box on winISD for my alpineas and it has a flat response all the way from a little above tuning frequency to 90hz where its cut off. but it well act a bit differnt int he car but should hit frequencies well above port tuning frequency..
the thing is if you tune the box too high say 45hz you wont hear anything below that..
ported boxes tend to be sloppier sounding and less cone control. where sealed tend to be tighter and quicker responding. but the choice is yours.
Chronos
Faded on 11/16/2004 02:56:49
whats winISD? is it like a box program?
Faded on 11/16/2004 02:58:40
And me being completely new to box making.. how do you tune the boxes to a certain say like 28hz cuz thats what the p3's suggested tuning is
uochronos on 11/16/2004 03:19:59
tuning the box is done by port length and diameter usualy companies show the dimensions of the port they suggest. however using the parameters of your sub you can find out exactly how big to make it for any frequency.
winISD is a program for plotting the frequency response of a sub and box.
it can be downloaded for free if you do a google search for it.
Chronos
P0werLifter on 11/16/2004 15:10:49
When it comes down to comparing Sealed and Ported enclosures, it mainly comes down to personal preferance. Sealed enclosures provide good punchy clean bass, but lack the low end ported gives you. Now, ported on the other hand, if built, and tuned correctly can still provide good punchy clean bass, and give you the real deep lows (25-40hz) us bassheads love, not to mension they provide more SPL output than sealed enclosures. BUT, if a ported enclosure is not built properly, it can sound like crap (sloppy bass response, muddy, in general,,,,crap). This is why more math, and making sure you get everythnig correct is a must when building ported enclosures.
Tuning in an enclosure, like chronos has stated above, is done using the Height, Width, and Legnth of a slot port,
or using the diameter and length of a circle port.
The lower the frequency you wish to tune to, the longer the port will be (and the more displacment it will have). Vice versa, the higher the tuning frequency, the shorter the port. Theres many different factors that go into tuning the enclosure such as, port area, port with and height, total internal cubic feet of the enclosure etc.
For simplicity i have plugged in the equation into microsoft excel and all you have to do, is add in the viariables it requires from the enclosure you are designing, and it will give you the length of the port in order to tune to that frequency.
If you would like, I can send it to you via e mail or yahoo msger, or if you would like, i can play around and design you an enclosure per the specs of your sub, and the space you have in the cab for the enclosure. But id reccomend giving it a shot yourself first (good learning experience).
Well i think this as pretty long drawn out post, and ive probly repeated myself many times so im gonna end it there for now GRIN, Hopse this helps ya out.
BTW, the forumla is in our DIY here
http://www.clubknowledge.com/Car_Audio_FAQ/?t16
-Jason HAPPY
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