info about spl

[zen 10+ year member]

looking for info about spl

how to made box for spl

big box more port = more spl?

how to measure a box for some subs? how big?

more port at smaller box?

i know hot to make subwoofer boxes but nothing special know about cu ft how to tune a box, 45 cornes and something about kerf so not that noob

how to use thiele parameter for a box

thanks for any reply will help

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[tommydh 10+ year member]

I would suggest one of the tuning calculation programs available. I use Torres to come up wit my volumes then use WinIsd to get idea of numbers it will produce. Thats the best thing I can offer I see alot of 4th order and 6th order boxes in big spl vids but thats nothing more than wat I see not know for sure.

Torres tuner will help with what size port and tuning it makes it easy to see how dimensions are affected wit each input. I have found it to be a great free tuner it gives you everything but db bc it doesnt use sub specs from data base only what you input. I think AJ designs is another program that gives you output calculation but I found it a little difficult to use but Im not very good with some computer stuff

 

[hispls 5,000+ posts]

Your best bet is to go to some real competitions and see what sort of thing works and doesn't work in whatever style car you are using. It's very vehicle specific and you will still invariably spend hundreds of dollars in wood building different boxes to test if you're trying to be competitive.

 

[zen 10+ year member]

I would suggest one of the tuning calculation programs available. I use Torres to come up wit my volumes then use WinIsd to get idea of numbers it will produce. Thats the best thing I can offer I see alot of 4th order and 6th order boxes in big spl vids but thats nothing more than wat I see not know for sure. Torres tuner will help with what size port and tuning it makes it easy to see how dimensions are affected wit each input. I have found it to be a great free tuner it gives you everything but db bc it doesnt use sub specs from data base only what you input. I think AJ designs is another program that gives you output calculation but I found it a little difficult to use but Im not very good with some computer stuff

i have heard about winisd but not torres will search it and see how it works... thanks

nothing serious.. i mean not about competition just for daily and get some fun with a few subs...

and also i have seen competition where they use big boxes but nothing serious, big subs but lil amps... removable ports but nothing with termalab and stuff like that

thanks willing to have time to make a box with winisd and torres, on vacations will be

 

[zen 10+ year member]

opinion, coments something else to review for spl software, tricks, tips...

 

[zen 10+ year member]

hi again

i was trying to fin out torres software but i couldnt

try some webs but link was expired or was a fake dont know if guys have it and can send it to me

 

[bbeljefe]

Here's the thread for Torres:

Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum

Keep in mind that Torres is not a modeling program. It's just a box cut sheet and tuning calculator. You have to know what you want to end up with before you start with it or t won't do you any good.

As for building SPL boxes, the idea is to tune at or close to the resonant frequency of the vehicle. Most vehicles peak above 50Hz, so if you really plan to do an SPL box, don't expect it to be musical. If you want some musicality but also SPL, tune at ~40Hz. But again, as has been mentioned, it's vehicle specific.

You also asked about port and box size. Port area is not box dependant, it's xmax and tuning dependant, meaning you need more port area for subs with higher xmax and boxes with lower tuning than you need with the opposite. If you have too much port area, you'll overdrive your subs and if too little, you'll have nasty port noise and low output.

 

[zen 10+ year member]

Here's the thread for Torres:Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum

Keep in mind that Torres is not a modeling program. It's just a box cut sheet and tuning calculator. You have to know what you want to end up with before you start with it or t won't do you any good.

As for building SPL boxes, the idea is to tune at or close to the resonant frequency of the vehicle. Most vehicles peak above 50Hz, so if you really plan to do an SPL box, don't expect it to be musical. If you want some musicality but also SPL, tune at ~40Hz. But again, as has been mentioned, it's vehicle specific.

You also asked about port and box size. Port area is not box dependant, it's xmax and tuning dependant, meaning you need more port area for subs with higher xmax and boxes with lower tuning than you need with the opposite. If you have too much port area, you'll overdrive your subs and if too little, you'll have nasty port noise and low output.

hey bbel ! i have tried with that link and did not work but i did now thanks

also thanks for info i thought it was obvious big box not a lot of port because less pressure inside for box. smaller box, more port as the tuning hz drop becuase more pressure can do in a little box (dont know if i explained my self ) but nothing for sure, just guessing

but know i feel a little bit more sure of that //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

thanks guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[will3 10+ year member]

Here's the thread for Torres:Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum

Keep in mind that Torres is not a modeling program. It's just a box cut sheet and tuning calculator. You have to know what you want to end up with before you start with it or t won't do you any good.

As for building SPL boxes, the idea is to tune at or close to the resonant frequency of the vehicle. Most vehicles peak above 50Hz, so if you really plan to do an SPL box, don't expect it to be musical. If you want some musicality but also SPL, tune at ~40Hz. But again, as has been mentioned, it's vehicle specific.

You also asked about port and box size. Port area is not box dependant, it's xmax and tuning dependant, meaning you need more port area for subs with higher xmax and boxes with lower tuning than you need with the opposite. If you have too much port area, you'll overdrive your subs and if too little, you'll have nasty port noise and low output.

I am not trying to be an a hole but why does lower tuning require more port volume I am just curious

 

[akadj 10+ year member]

I am not trying to be an a hole but why does lower tuning require more port volume I am just curious

Your port is going to get longer or your box is going to have to be bigger when you tune lower.

And you need a certain amount of port area in relation to how much Xmax or air your going to move.

And OP... If you want a daily ground pounder that does hair tricks and moves tons of air then you don't want an SPL

 

[will3 10+ year member]

Your port is going to get longer or your box is going to have to be bigger when you tune lower.
And you need a certain amount of port area in relation to how much Xmax or air your going to move.

And OP... If you want a daily ground pounder that does hair tricks and moves tons of air then you don't want an SPL

I get xmax and sd play into port cross section just not lower tuning

A longer port doesn't always mean a larger one

And if you are not figuring off of box volume it shouldn't matter how large the enclosure is related to the cross section of the port .

There again I have read this around forums a couple of times I am just curious to were lowering your tuning needs more port volume with all other things equal

 

[bbeljefe]

I am not trying to be an a hole but why does lower tuning require more port volume I am just curious

No worries and thanks for replying so I could re read what I mis wrote.

Higher tuning requires more port area, not lower tuning. That was a mistake on my part, so sorry bout that.

I'm not an acoustical engineer so I don't really feel comfortable trying to explain the details of why but, I'll try and hopefully someone more knowledgeable will pop in and correct my if I'm wrong or, affirm.

With high tuning, more air is moved in a given slice of time so more port area is required in order that port noise is minimized. Likewise, higher xmax means more air is moved, regardless of frequency.

 

[akadj 10+ year member]

I get xmax and sd play into port cross section just not lower tuningA longer port doesn't always mean a larger one...

With all things equal lower tuning means longer port

1 cuft enclosure minus displacement of 4" port tuned to 50 hz = 12" long port(0.1 cuft displacement)

1 cuft enclosure minus displacement of 4" port tuned to 40 hz = 24" long port(0.2 cuft displacement)

 

[zen 10+ year member]

No worries and thanks for replying so I could re read what I mis wrote.
Higher tuning requires more port area, not lower tuning. That was a mistake on my part, so sorry bout that.

I'm not an acoustical engineer so I don't really feel comfortable trying to explain the details of why but, I'll try and hopefully someone more knowledgeable will pop in and correct my if I'm wrong or, affirm.

With high tuning, more air is moved in a given slice of time so more port area is required in order that port noise is minimized. Likewise, higher xmax means more air is moved, regardless of frequency.

that sounds logic too,

but just guessing and also sounds logic to me if you have lower frecuencie playing you move tons of air, down 30 hz more pressure inside the box, and with more port subwoofer move easier instead a lil port less movment o not less movoment... more dificult to play low low frecuencies dont know how to say

 

[akadj 10+ year member]

that sounds logic too, but just guessing and also sounds logic to me if you have lower frecuencie playing you move tons of air, down 30 hz more pressure inside the box, and with more port subwoofer move easier instead a lil port less movment o not less movoment... more dificult to play low low frecuencies dont know how to say

But just because you have subs with high xmax and play low frequency moving tons of air it doesn't mean you have high SPL

And a smaller port cross section or longer port will play lower frequency.

When.you say subs play easier with more port sounds like your referring to box rise because of back pressure?