15" Ported Design Help ? 20W x 24H x 24D (external dimentions) - AVS Forum

AVS Forum > Audio > DIY Speakers and Subs > 15" Ported Design Help ? 20W x 24H x 24D (external dimentions)

DIY Speakers and Subs

randyc1's Avatar randyc1
07:58 PM Liked: 23
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08-05-2014 | Posts: 750
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Would like to upgrade my current 2 -12" RSS315HO,3.6cuft net Subs with 15" subs in bigger cabs. The biggest I would like to go is 20W x 24H x 24D,which comes out to (6.6cuft External). these dimension allow me to use them upright 24"high or on there sides 20" high.

I will build 4 for my 22'x24'x8' room. 2 front firing,slotted, martystyle, and 2 downfiring to be a little less obvious for the back of my Media room.

Drivers : 4 x RSS390HO or SI 15D4" ? Powered by a inuke 6000dsp ??, dont know which Driver would turn out better for this size enclosure after port and tune are determined ?. Will be used mainly for HT.


Picture of what i have now


Thanks !!
Attached: IMG_3147.jpg (184.9 KB) 
chalugadp's Avatar chalugadp
08:12 PM Liked: 1165
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Si15d4 and you can run 2 off of inuke3000dsp. Both drivers will perform similar but Dayton will need inuke6000 for full power.
Your tuning will be 21-22hz. Usuable to 17hz.
randyc1's Avatar randyc1
10:08 PM Liked: 23
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Quote:
Originally Posted by chalugadp View Post
Si15d4 and you can run 2 off of inuke3000dsp. Both drivers will perform similar but Dayton will need inuke6000 for full power.
Your tuning will be 21-22hz. Usuable to 17hz.
Hi Chalugadp Thanks , ...I dont have WinISD, is this how you calculated Net Vol and Port ?
chalugadp's Avatar chalugadp
10:11 PM Liked: 1165
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Quote:
Originally Posted by randyc1 View Post
Hi Chalugadp Thanks , ...I dont have WinISD, is this how you calculated Net Vol and Port ?
Seen so many sizes that I know tuning pretty well. Your slightly smaller then cube and bigger then micro.
randyc1's Avatar randyc1
04:09 PM Liked: 23
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...Just need someone who can design this for me now
chrapladm's Avatar chrapladm
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Do you have the 15" SI's already?
randyc1's Avatar randyc1
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Quote:
Originally Posted by chrapladm View Post
Do you have the 15" SI's already?
Hi again Chrapladm,... no I don't , not sure between SI15" or RSS390HO for the dimentions I want to build ?, ...if very similar the SI15 is $145.00 though ?
chrapladm's Avatar chrapladm
07:42 PM Liked: 102
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Unless you see them online I dont believe the SI 15's are available any more. The UM15's are from Dayton. The 390 has less excursion than the UM15. BUT its your call.
randyc1's Avatar randyc1
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Quote:
Originally Posted by chrapladm View Post
Unless you see them online I dont believe the SI 15's are available any more. The UM15's are from Dayton. The 390 has less excursion than the UM15. BUT its your call.
...The SI still have D4's and the UM15 takes a huge ported box , way bigger than the Ext: 20x24x24 i would like to build. so i guess the 2 best for the money are the SI and RSS.

How much depends on TS Paremeters ?
chalugadp's Avatar chalugadp
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Quote:
Originally Posted by randyc1 View Post
...The SI still have D4's and the UM15 takes a huge ported box , way bigger than the Ex: 20x24x24 i would like to build. so i guess the 2 best for the money are the SI and RSS.

How much depends on TS Paremeters ?
The UM won't work in a ported box that small. The Dayton can handle more power and i know it works great in that size. Never used the si15 in that size cab.
randyc1's Avatar randyc1
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Quote:
Originally Posted by chalugadp View Post
The UM won't work in a ported box that small. The Dayton can handle more power and i know it works great in that size. Never used the si15 in that size cab.
The SI15" has Same power handeling as the 18"..which from what we have learned is quit a bit more than 600W,..I guess it all depends on the TS parameters ??
randyc1's Avatar randyc1
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...Anybody willing to Design-Model these for me in a 4.4cuft net cab with the SI15"

Ext Enclosure: 20Wx 24Hx 25D.
Slot Port : 17.75W x 1.5" ?
randyc1's Avatar randyc1
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...Anyone like Modeling a Driver ?
RickJames's Avatar RickJames
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Bill's Simplexx 15 sub is 20x20, 24.5 high. An SPL chart with the RSS390 HO is in this thread, http://billfitzmaurice.info/forum/vi...p?f=12&t=20963
Bassment's Avatar Bassment
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what tune do you want? The port length is dependant on the tuning frequency.
Bassment's Avatar Bassment
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For a 20 hz tune you need approximately:

Ext Enclosure: 20Wx 24Hx 25D.
Slot Port : 17.75W x 1.5" x 31"
randyc1's Avatar randyc1
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Quote:
Originally Posted by Bassment View Post
For a 20 hz tune you need approximately:

Ext Enclosure: 20Wx 24Hx 25D.
Slot Port : 17.75W x 1.5" x 31"
Yes thanks Bassment !!,

Thats about what i had calculated also,... just wished I could get someone to model this for me with the SI15" to check if everything is were it should be , Vent speed, Ideal Tuning ..ect ?
chrapladm's Avatar chrapladm
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Dont worry about ideal tuning. And I will post another simulation with that port size.
randyc1's Avatar randyc1
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Quote:
Originally Posted by chrapladm View Post
dont worry about ideal tuning. And i will post another simulation with that port size.

Great Thanks !!
Bassment's Avatar Bassment
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2nd order 17 hz HPF
5 cubic feet internal box
20 hz tune
900 watts
under xmax at all frequencies
randyc1's Avatar randyc1
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Quote:
Originally Posted by Bassment View Post


2nd order 17 hz HPF
5 cubic feet internal box
20 hz tune
900 watts
under xmax at all frequencies


Thanks Bassment ,... mine is actually 4.4cuft net

This is what LTD came up with (Micro thread) for the SI15 in a Smaller 3.5cuft @23 Hz tune
...Pactally Identical ?? ...Is it just beacause he used 1100W ??
Bassment's Avatar Bassment
09:05 AM Liked: 164
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yep, the extra watts would make up for the tiny bit of sensitivity lost by going to a smaller box size.
randyc1's Avatar randyc1
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Quote:
Originally Posted by Bassment View Post
yep, the extra watts would make up for the tiny bit of sensitivity lost by going to a smaller box size.

Thanks again Bassment for helping me out !!
Bassment's Avatar Bassment
09:40 AM Liked: 164
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you want a 35.5" long slot port then if your net internal is 4.5 cu ft, for a 20 hz tune
randyc1's Avatar randyc1
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Quote:
Originally Posted by Bassment View Post
you want a 35.5" long slot port then if your net internal is 4.5 cu ft, for a 20 hz tune
Thanks ,..How do you go about choosing the ideal "Tune",.. is it a compromise of SPL and Extension ?

Will the fact that i will be building 4 Subs change the choosen "Tune" ?

Thanks again !
Bassment's Avatar Bassment
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Yea a compromise of SPL and extension, and also box size. 4 sub's won't effect what tuning you want, it's the box size mainly. My thoughts for SI (15 or 18), and most other HT subs, is to tune in general:

13 cu ft to 14 hz
6.5 cu ft to 17 hz
4 cu ft to 20 hz

I don't find small changes in tuning frequencies to be noticeable at all. I don't think someone could tell the difference between a 19 hz and 20 hz tuning frequency. To do large jumps in optimal tuning frequencies you need to do large changes in box sizes.
randyc1's Avatar randyc1
01:32 PM Liked: 23
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Quote:
Originally Posted by Bassment View Post
Yea a compromise of SPL and extension, and also box size. 4 sub's won't effect what tuning you want, it's the box size mainly. My thoughts for SI (15 or 18), and most other HT subs, is to tune in general:

13 cu ft to 14 hz
6.5 cu ft to 17 hz
4 cu ft to 20 hz

I don't find small changes in tuning frequencies to be noticeable at all. I don't think someone could tell the difference between a 19 hz and 20 hz tuning frequency. To do large jumps in optimal tuning frequencies you need to do large changes in box sizes.

...OK last question Bassment , ...do you have any idea if my Port Velocity is OK with my
17.75" x 1.5" (26.6sq in) Slot Port ? The Area comes to a little over the same area as( 2) 4" Round ports ???
Bassment's Avatar Bassment
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Ya it was good
randyc1's Avatar randyc1
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Quote:
Originally Posted by Bassment View Post
Ya it was good
Thanks soo much for taking the time to help me !!
chrapladm's Avatar chrapladm
07:22 PM Liked: 102
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08-18-2014 | Posts: 2,958
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Glad you got it sorted.
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