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MHB 4818 Simulation

Printed From: Speakerplans.com
Category: Plans
Forum Name: Ported Enclosures
Forum Description: Post all your reflex and bandpass and 'other' boxes with holes in stuff here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=70828
Printed Date: 13 August 2022 at 11:06am
Software Version: Web Wiz Forums 12.05 - http://www.webwizforums.com


Topic: MHB 4818 Simulation
Posted By: jaya000
Subject: MHB 4818 Simulation
Date 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 





Replies:
Posted By: _djk_
Date Posted: 16 September 2012 at 10:31am
A MHB 4818 is a box, what is the driver?

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djk


Posted By: jaya000
Date 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? 


Posted By: Peter Jan
Date 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 ?


Posted By: _djk_
Date Posted: 16 September 2012 at 12:50pm
That looks like a very good driver for the MHB 4818 (Keele W-bin).

-------------
djk


Posted By: jaya000
Date 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?  


Posted By: Peter Jan
Date Posted: 16 September 2012 at 5:07pm
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.


Posted By: jaya000
Date 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 . 


Posted By: Peter Jan
Date 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.


Posted By: geraelec2
Date 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.


Posted By: sn95
Date Posted: 03 July 2015 at 8:26pm
YES free speaker plans or free horn plans


Posted By: mhtplsh
Date 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" rel="nofollow - uploads/2632/MHB_4818_LIKE_W_BIN_box.pdf


Posted By: djhimu
Date Posted: 26 July 2018 at 2:21pm
where is the front part design?



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