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help needed making enclosure for JBL W15GTI MKi

5892 Views 15 Replies 10 Participants Last post by  BP1Fanatic, 
zeeshan tariq
Hello . some one can help me making ported enclosure for JBL W15GTI MKi keeping qtc .707 in mind
i want to use it in my HT . room size i 18x24x11
i want to go for slot port rather then round port
im posting t/s parameters
174046
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Blaser
Hi there,

Had this sub for a long time in my car. A very good one! Not sure if it will go deep enough for HT though.
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B
This parameters only apply to a sealed enclosure. Be mindful that once you use a open port other parameters must be check. Air act as a resistor, so once you let them escape the resistance change, therefore you frequency extension and so for...you have literature to consider.
Educate yourself, it is a rewarding experience. (IMHO)
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PDXooo
What model amplifier are you going to use? I design enclosures around Peak wattage, so I need that data, as well as the ohmage of each of the subwoofer's coil... Give me that data & I'll make a model & message details to you...
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BP1Fanatic
See if it work in 1 of the BP6 Devastators on avsforum.com. There is a measured $29 JBL 12 Devastator enclosure on the site with 4 drivers. Most of the enclosures have around a 19hz tune for home theater.
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Toffkanda
3
Hello zeeshan, from WinISD this sub does well in 9cuft (excluding ports, driver displacement and bracing) at 20hz tune. Power is limited to about 780 watts I don't know much about box Q @. 707 but the box requires three 4 inch ports of 25.5inch length each limiting max airspeed @24m/s to control port airspeed and max excursion . You would need a high pass filter 2nd order at 18hz. It should achieve 20hz @ 114db and 17.5 hz @110db without the help of the room.
If you have two of these, I think you you would be happy. Your amplifier will need to be stable at 3 ohms for this sub.

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Sorry, but this woofer was simply not designed to be used in a vented enclosure.

You will be much happier if you mount in the recommended sealed enclosure and using some bass boost if needed.
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Toffkanda
rick.sykora said:
Sorry, but this woofer was simply not designed to be used in a vented enclosure.

You will be much happier if you mount in the recommended sealed enclosure and using some bass boost if needed.
Click to expand...
A large number of of Subwoofer drivers used in home theatre builds on this and other forums are adapted from other purposes and recommended configurations but are doing very well. That is what box building softwares are all about. Besides the EBP is basically borderline (49.4) and OP wants a ported alignment.
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R
Just because you can does not mean you should, but it is the OP’s choice. He could go up to 5 cu. ft. sealed and still be able to push lower with eq. without needing a high pass filter.

I also get that some are just trying to create movie special effects, but 9 cu. ft. is a major project, needs serious bracing and takes much more space. So there are a range of answers here and I would tend to sealed as it is a better fit in this case.

For the record, have been building subwoofers for 3 decades and have both sealed and vented ones currently. ?
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BP1Fanatic
Here you go!
333 liter Tapered-Tapped Quarter Wave Tube (T-TQWT or negative flare tapped horn [TH]).
I supplied a 333L BR and a 333L TH for comparison.
Bare in mind, all 3 enclosures can be built with 7 panels in their simplest form (not including bracing).
In their simplest form, the 2 TH's would be 71.5"H x 17.5"W x 20.25"D.
HT = negative flare.
Music = positive flare.
Parallel
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JamesDDoX
zeeshan tariq said:
Hello . some one can help me making ported enclosure for JBL W15GTI MKi keeping qtc .707 in mind
i want to use it in my HT . room size i 18x24x11
i want to go for slot port rather then round port
im posting t/s parameters
View attachment 174046
Click to expand...
BP1Fanatic said:
Here you go!
333 liter Tapered-Tapped Quarter Wave Tube (T-TQWT or negative flare tapped horn [TH]).
I supplied a 333L BR and a 333L TH for comparison.
Bare in mind, all 3 enclosures can be built with 7 panels in their simplest form (not including bracing).
In their simplest form, the 2 TH's would be 71.5"H x 17.5"W x 20.25"D.
HT = negative flare.
Music = positive flare. View attachment 174095
Click to expand...
Can't agree more with BP1Fanatic , Sealed.. face it backward to a wall with little gapes .. if needed.
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BP1Fanatic
Why can't you agree with me?
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GPM
Hmm, started to respond, but yours are similar enough plus the OP joined then apparently left months ago, so at this late date will just agree with you except prefer inverse tapered for both apps. ;)

GM
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JamesDDoX
BP1Fanatic said:
Why can't you agree with me?
Click to expand...
hello Fanatic, what i meant was.. I am totally agree with you , (I can't agree with you more) . Ops my bad lol.
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P
This is a possibility......makes a pretty awesome HT sub. DECWARE's House Wrecker Car or Home Audio Subwoofer Cabinet
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BP1Fanatic
It's a BP6P just like the Devastators on avsforum.com. The enclosures I modeled are BP6S.
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