Max RMS in ported box, help..

[OLD_SCHOOL 10+ year member]

ok just added ya

 

[mr_f4ke 10+ year member]

nobody answer my question jejeje.. i have a 36 hz 3cuft ported box, 300 rms for each sub will be ok?

 

[UndercoverPunk 5,000+ posts]

nobody answer my question jejeje.. i have a 36 hz 3cuft ported box, 300 rms for each sub will be ok?

try it out... let us know...

 

[jellyfish420 10+ year member]

nobody answer my question jejeje.. i have a 36 hz 3cuft ported box, 300 rms for each sub will be ok?

3ft for each sub? 3ft sounds kinda big. or 3 ft for both. . . they would prolly love that.

and p.s. noone answered your original question because you didn't say till just now how big the box was.

 

[Norcalracer283 10+ year member]

My TYpe R's can handle a lot of wattage if they are in a very small box....but mechanically, with my box, they can only take 485 before they hit X max.

 

[jellyfish420 10+ year member]

i plotted out your sub and box. and i will hit xmax . . . in a 3ft box total at around 600w apiece. but in a box with 3ft per sub(6ft total) it will reach xmax around 250w apiece.

p.s. these are all round about numbers. and given you don't clip the hel out of them.

 

[jellyfish420 10+ year member]

i plotted out your sub and box. and i will hit xmax . . . in a 3ft box total at around 600w apiece. but in a box with 3ft per sub(6ft total) it will reach xmax around 250w apiece.p.s. these are all round about numbers. and given you don't clip the hel out of them.

but if you do it in a 3ft box per sub and try to put 600w an them a piece be careful becausethat will probably exceed the thermal handeling of thesubs and they will never hit xmax.

 

[mr_f4ke 10+ year member]

i have 3cuft for both subs.. so 300 rms for each one will rock? thx

 

[CKY 10+ year member]

So the limit of the sub (as the limit where it won't get ****ed) is the VAS of the sub at the RMS rating of a sub ?

 

[CKY 10+ year member]

So the limit of the sub (as the limit where it won't get ****ed) is the VAS of the sub at the RMS rating of a sub ?

Bump //content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif

 

[squeak9798 5,000+ posts]

So the limit of the sub (as the limit where it won't get ****ed) is the VAS of the sub at the RMS rating of a sub ?

Not quite sure what you are saying........the RMS of a sub is typically the thermal power handling of the voice coil (i.e. that amount of power won't fry the voice coils). But the mechanical power handling is dependent upon the size of the box.....as stated earlier, for a sealed box, small box = high mechanical power handling; large box = lower mechanical power handling. Since a box volume close to VAS is typically at the "larger" end of the box size spectrum for a given sub (since going too much over VAS causes the sub to act as if it were in an IB alignment [no box at all]), it's mechanical power handling would likely decrease well below the RMS wattage in a box close to it's VAS, in my opinion. Best way to find out the mechanical power handling limits is to load everything into a box program and look at the excursion graphs.

 

[jellyfish420 10+ year member]

Not quite sure what you are saying........the RMS of a sub is typically the thermal power handling of the voice coil (i.e. that amount of power won't fry the voice coils). But the mechanical power handling is dependent upon the size of the box.....as stated earlier, for a sealed box, small box = high mechanical power handling; large box = lower mechanical power handling. Since a box volume close to VAS is typically at the "larger" end of the box size spectrum for a given sub (since going too much over VAS causes the sub to act as if it were in an IB alignment [no box at all]), it's mechanical power handling would likely decrease well below the RMS wattage in a box close to it's VAS, in my opinion. Best way to find out the mechanical power handling limits is to load everything into a box program and look at the excursion graphs.

preach on brother squeak! how come noone can grasp this concept?

 

[CKY 10+ year member]

Thanks squeak9798 for the complete answer !!! In my case the subwoofer is a Alpine Type R SWR-1241D , with a VAS spec of 2 cu. ft. , max RMS rating 300W. I will be going with a 1.5cu.ft. ported box with 300W going to the sub .... will it be ok ?

And could you please tell me what program should i use to see the excursion chart?

Thank you in advance ! //content.invisioncic.com/y282845/emoticons/wave.gif.002382ce7d7c19757ab945cc69819de1.gif

 

[squeak9798 5,000+ posts]

http://www.linearteam.org - download WinISD Pro

Then follow these instructions:

And here is the download link [for the update to WinISD Pro]:

http://koti.mbnet.fi/jahonen/Audio/WinISDpro/WinISDProUpd.zip

Please try it out, everybody. Major new feature is the filter simulation. That's my personal long-time-favourite feature 8) Any comments are extremely welcome.

Oh, forgot to mention that aforementioned new version should be extracted on top of existing installation of WinISD pro. I also recommend deleting file "unitindex.dat", that might help for possible problems in unit handling, what might otherwise occur.

So you need to download WinISD Pro from the first website, and then install the update over the WinISD Pro that you just downloaded.

 

[helotaxi 5,000+ posts]

I don't know why people don't get this. I spent the month of August trying to explain it in multiple threads...