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8" subwoofer horn

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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 Topic: 8" subwoofer horn
    Posted: 09 October 2017 at 6:09am
I was looking for a set of plans for a front loaded horn using an 8" Atomic AP8 subwoofer.... I have all the t/s.

I wanted Something that would really only just play loud from 50hz to 60hz. "Peaky" if that's what you call it, and it has to be within that range.

Something that has a straight taped flare like a trombone. I have a lathe and CNC so it will be super easy and would be a cool project




I don't know how to calculate the tuning for the throat,straight axis,and mouth to tune between 50Hz - 60hz

Any help would be appreciated.
Thanks,

Edited by akadj - 09 October 2017 at 6:10am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2017 at 8:42pm
Well, using 50Hz, for 1/4 length you'll be looking at just under 1.5m and for full length it would be 6m!

Best thing is to download a copy of HornResp (Google it, it's free), put the T/S params in and go from there.
Chas n Dave : it's like Drum and Bass but with beards.

E=mc² ±3dB
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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: 10 October 2017 at 3:55am
I don't have a computer, only a smart phone but don't think hornresp will work on it

I.5 meter is pretty much what I was expecting. . . Just not sure about mouth and throat

Does anyone have the program and able to plug these in to get me the required dimensions?

Thanks
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Keen View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2017 at 6:47am
post the t/s, someone will get on it for you. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2017 at 10:00am
Whats the point of 50-60 hz only? Also, this might be easier to realize as a bandpass, if you are absolutely insist on restricting response to that small bandwidth...
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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: 10 October 2017 at 7:36pm
Name=    ap8.44.new qt motor ww 40
Note=    
Model=    TSL
Domain=    FreeAir
Shape=    Round
Profile=    Cone
Fmd=       3.0000 KA
Qmd=       1.0000
Flp=       8.0000 KA
Qlp=       2.0000
Znom=       4.0000    Ohm
Revc=       7.2000    Ohm
Sd=      25.0000E-3    M²
Mmd=      95.3400    g
Pmax=       1.0000E3    W
Rtvc=     250.0000E-3    °C/W
Xgap=      10.0000E-3    M
Xcoil=      40.0000E-3    M
Xmax=      15.0000E-3    M
Krm=      11.1100    mOhm
Erm=     899.0000E-3
Kxm=     280.3000    mH
Exm=     530.0000E-3
Rms=       4.3376    N·S/M
Mms=      97.6116    g
Cms=     128.1486    uM/N
Vas=      11.4397    Ltr
Fo=      45.0000    Hz
Qms=      6.3627
Qes=      0.5359
Qts=      0.4942
BL=      19.2567    T·M
Levc=       4.5970E-3    H
SPLo=      84.7250    dB
No=     186.5000E-3    %



I guess I could build an enclosure with the flared straight horn and a bandpass and see which performs the best. 

that would be fun too!, its only wood and quick to make!

the total usable space i have for this 8" is 75cm wide 38cm tall, 100cm in depth
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 11 October 2017 at 6:46am
is this for some kind of sound effect use? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 11 October 2017 at 3:54pm
Is this one of those fake posts???
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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: 11 October 2017 at 4:34pm

no joke guys, just kinda want to get started on these projects, here a photo of the 8" 1500 watt RMS woofers i will be using!


Edited by akadj - 11 October 2017 at 4:35pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 11 October 2017 at 6:47pm
Do you literally intend this loudspeaker to play "from 50 to 60h", or do you mean "from 50 or 60 hz upwards"?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 11 October 2017 at 6:49pm
Oh, and looking at the qts of that car audio driver, it is not very suited for horn loading
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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: 11 October 2017 at 9:43pm
i will only play in the 50hz to 60hz range
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