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MHB 4818 Simulation
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jaya000 View Drop Down
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Joined: 24 August 2008
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    Posted: 16 September 2012 at 6:30am
I want to use this cabinet to match speaker i have. 
I want guidance for hornresp input. 

I have done but i think i need some guidance specially for ATC. 
Please tell me if my hornresp inputs are correct or not? 
So i need guidance from experts 
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_djk_ View Drop Down
Old Croc
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 10:31am
A MHB 4818 is a box, what is the driver?
djk
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jaya000 View Drop Down
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Points: 59 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 10:59am
Thanks DJK. 
The driver is Chinese made. I have tested it for thiel-small parameters with LMS. 

Fs : 34.86
Qms : 21.68
Qes Z: 0.32
Qts : 0.318

Vas : 171.86
Re : 5.0 ohm
Sd. 1195
Mmd : 222.24
Lerc 3.41
Cms 84.75
Spl 95.4
BL : 28.9

This is with 4 layer voice coil. 

Any mistakes? 
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Peter Jan View Drop Down
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Joined: 16 December 2008
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Points: 1019 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 12:31pm
Looking at the figures and if they are correct (seems okay with the sensitiviy figure not exagerated), it seems like a decent low driver that may have an Xmax of around 8mm or something. But what respons are you after ? Do you have these 4818 already made and look for a suitable driver or do you have drivers and look for a cabinet to put them in or is everything at this point just a start from scratch ?
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 12:50pm
That looks like a very good driver for the MHB 4818 (Keele W-bin).
djk
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jaya000 View Drop Down
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Points: 59 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 4:56pm
Originally posted by Peter Jan Peter Jan wrote:

Looking at the figures and if they are correct (seems okay with the sensitiviy figure not exagerated), it seems like a decent low driver that may have an Xmax of around 8mm or something. But what respons are you after ? Do you have these 4818 already made and look for a suitable driver or do you have drivers and look for a cabinet to put them in or is everything at this point just a start from scratch ?

I have the driver. So looking for the cabinet.
In my country W bin is quite popular, hence was checking the same for driver i have. 

Thanks djk,
you are always helpful.

My hornresp input is ok?  
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Peter Jan View Drop Down
Young Croc
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Joined: 16 December 2008
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Originally posted by jaya000 jaya000 wrote:


My hornresp input is ok?


Atc looks about right, depending on what you considder as being the compression chamber and the throat or the onset of the horn, but I can't see Vtc being 30 liter, that should be less.
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jaya000 View Drop Down
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Points: 59 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 5:17pm
Thanks Peter Jan,

I calculated the area marked as Vtc.

The calculation is as under

42.07 width till horn starts
10.6 height 
57.4 depth of the box.

so it calculated as 42.07 x 10.6 x 57.4 = 25597 + added speaker volume 4403.
So i rounded as 30000. 
The triangle volume i adjusted towards round cutout of plywood . 
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Peter Jan View Drop Down
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Points: 1019 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2012 at 5:48pm
The baffle is roughly 33cm x 33cm or ~1100cm² where the horn begin, so S1=1140 as you put it in, was a good starting point. It's a bit hard to determin where the the compression chamber truelly ends and the horn begins, but it's certainly not much more than the volume the speaker cone encloses up to the mounting baffle or a bit more than that 4,4 liter.
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geraelec2 View Drop Down
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Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote geraelec2 Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2015 at 7:35pm
Originally posted by jaya000 jaya000 wrote:

Thanks Peter Jan,

I calculated the area marked as Vtc.

The calculation is as under

42.07 width till horn starts
10.6 height 
57.4 depth of the box.

so it calculated as 42.07 x 10.6 x 57.4 = 25597 + added speaker volume 4403.
So i rounded as 30000. 
The triangle volume i adjusted towards round cutout of plywood . 


Hi. I loved all the tips and information given in this post, thanks to everyone. In other business, is there any chance to get the image with a better resolution? Please, thanks in advance.
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2015 at 8:26pm
YES free speaker plans or free horn plans
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mhtplsh View Drop Down
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Points: 112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mhtplsh Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2017 at 5:24pm
Originally posted by sn95 sn95 wrote:

YES free speaker plans or free horn plans

Sorry sn95. i saw it today so posting today.
uploads/2632/MHB_4818_LIKE_W_BIN_box.pdf
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