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8" subwoofer horn

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bob4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 5:21am
oh, I see...... do you care to elaborate how and why you arrived at this design specification? It seems a very odd thing to do. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 4AC Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 11:44am
Talking about one note bass LOL
uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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Peter Jan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 1:11pm
With these T/S parameters and the given that you want only solid respons between about 50 to 60 Hz, I would make a 6th order bandpass cab and tune one port around 47-48 Hz and the other port about 63-64 Hz.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 4:23pm
Originally posted by 4AC 4AC wrote:

Talking about one note bass LOL

Originally posted by bob4 bob4 wrote:

oh, I see...... do you care to elaborate how and why you arrived at this design specification? It seems a very odd thing to do. 



I had a hunch when I saw the pic, so a bit of Google-fu shows these are from a brand that specialises in models for car audio competitions - they use specific tone bursts rather than real music, hence only wanting to cover a small frequency range.

It also means cabin gain from the vehicle will affect the response and make normal models inaccurate as far as SPL goes.

Lastly, a few of the specs seem bogus - they claim it's a 4Ω nominal driver, but Re is 7.2Ω.
I've already checked and the maker does not state this is a dual voice coil driver, so we can't even assume the 7.2Ω is for each VC with the 4Ω referring to 2 in parallel.
OP also states it's a 1500W driver but the specs posted show Pmax of 1000W, so frankly, I wouldn't trust the specs anyway.

Apologies to OP if this comes across a bit negative, best advice I can come up with is find a forum that specialises in car audio rather than this one perhaps?

Good Luck,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bass*en*mass Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 6:26pm
i`d second the 6th order bandpass cab option for the required narrow passband..
1/4wave resonator/transmissionline might be an option too.
full frontloaded horn will be too big and wasted imo, bandpasshorn with large front chamber might work though.

tbh., that car hifi driver is not ideal to start with..
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akadj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote akadj Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 9:45pm
So i guess to start with yes, the driver is a dual 4 ohm coil so RE is 7.2 ohms. The woofer has a 2-1/2" flat wound copper coil with dual progressive spiders, trust me they take 1500 watts .

The manufacture is one of the oldest manufactures in the USA for audio speakers "SJA INDUSTRIES" so they are very reliable. perhaps they re rated the woofer.

I did think about a 6th order series bandpass but thought a horn would be smaller? maybe i'm mistaken...

I've been watching some of the videos since i cant run the program, trying to learn about tuning a horn.
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