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cabinet desgin clarification ?

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streekz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Topic: cabinet desgin clarification ?
    Posted: 25 April 2016 at 11:00pm
Hey there fellow SP's
I was wondering if anyone could clarify if i can use WinISD to select a better driver for this 15" box design Or will i need to use hornresp ?  i've only really started to learn/Practise on WinISD recently.


  Its very rough sketch of the cabinet (just to get the idea)
  Many thanks for reading



Edited by streekz - 25 April 2016 at 11:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2016 at 11:06pm
You might need to explain the concept for it because at a first glance I can't really see what you're trying to achieve with it.  Is this a new design or is it already built?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2016 at 7:30am
thanks alot its a DAP audio SM-15B
i cant seem to find any specs of it
i bought them thinking they were standard ported boxes with the idea to upgrade the drivers using WinISD as a project , eventually to be used above our 18" subs for upper bass/low mid    
im not sure if you class the vent as a standard port or is it a hybrid because of the tapering
regards
   

Edited by streekz - 26 April 2016 at 8:20am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2016 at 8:32am




best pictures i could take
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2016 at 9:17am
How does it sound?
I assume that the "horn" is expanding being smallest at the throat? (unlike the drawing)
You can sim this with hornresp:
-first part is placement / amp
-second part is horn sections made up by cross sectional areas & length between these.
-third is driver specs.
-Last is rear/front chamber
You have to choose a menu option for rearloaded / tapped
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2016 at 3:41pm
Ive only tested/listened to it at home connected to a channel of my hifi amp via the upper bass/mid output of our Pre-amp. It sounds ok but have not tested properly with all our PA Amps in a room/venue.
 Yes, expanding from throat as far as im aware The sketch ive drawn was to show the port/horn shape from a side view so you could see if it was a horn or port. It wasn't a very accurate drawing.
I may have a problem then as ive never even tried to use Hornresp yet Confused
I thought myself when looking at the cabinet it may not be a straight forward BR cabinet

I may have to enlist the help of someone to aid me or start to see if i can understand Hornresp

I will take driver out and get as accurate measurements as i can 

Thanks


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2016 at 9:09pm
It makes a lot more sense from the photo because on your drawing it wasn't clear which was the front of the cabinet!

You probably can get a close enough simulation using Hornresp.  It's a bit of a hybrid between a reflex and a scoop really.  More of a long port than any kind of horn though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2016 at 12:07am
many thanks for confirming my gut feeling
i suppose the next question is if i use the forums sticky on the hornresp guide will i be able to understand how input the details correctly from my measurments i take from box, meaning is the guide written from a perspective of designing a horn from scratch, not the way im trying to do it
As you can tell ive never really used hornresp and wondering if its a bit too complicated
i love building em not so confident at the designing them

Edited by streekz - 27 April 2016 at 12:08am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mobiele eenheid Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2016 at 8:21pm
I've just update the sticky (here and there). You should be able to simulate the DAP as an "hybrid".

Johan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2016 at 10:05am
Many Thanks
i will try and see if i can get my head round it
could anyone tell me, or better still mark out on my sketch  how best to split the rear horn/port so i can take the measurements.
Do i split horn into three sections as it starts from the throat as in my picture ?
Or am i coming at it all wrong ?
Regards

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2016 at 10:13am
Looks fine, but remember the front, often people take "phantom horn" into account, this is what extends on the floor, a bit confusing, read last paragraph here:
http://speakerplans.com/index.php?id=faq14

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Post Options Post Options   Thanks (0) Thanks(0)   Quote streekz Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2016 at 1:18pm
Thanks
I'll give it read
im a bit confused myself if take the measurement of whole area as it comes from the mouth  to the tapering towards the front facing speaker
or do i just take the measurement like this sketch and ignore the part infront of speaker ?
does that section ive marked in blue still contribute to the horn ?
Regards

 
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