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Old 15th April 2014, 02:13 AM   #1
Colza is offline Colza  New Zealand
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Default Wall mounted FE126EN

I have a couple of FE126EN's here which never made it into a project, and I have an odd room which doesnt have enough space for floor standing speakers without them getting in the way. Ive been thinking of finding a box design which could allow the FE126EN to be wall mounted.

I did some searching for ideas and came accross this:
diyAudio Full Range Reference Project

Is it possible to shuffle the dimensions of a ML-Voigt to make it flatter so I could mount them on a wall?

I am thinking of halving the depth to 75mm internal, and changing the width and height so the internal volume and rate of expansion remain the same.

Thoughts?

The basic idea would be to produce something along the lines of this but with geometry suited for my FE126EN:
http://www.hifi-forum.de/viewthread-267-246.html

Last edited by Colza; 15th April 2014 at 02:21 AM.
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Old 15th April 2014, 03:47 AM   #2
xrk971 is online now xrk971  United States
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Try a Flat BIB or FIB.
Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?

Click the image to open in full size.

Click the image to open in full size.

Actually, 3 in deep. Sounds great.

Use the BIB calculator for the FE126 and flatten the dimensions, preserving CSA and making it an offset central V.
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Old 15th April 2014, 04:45 AM   #3
Colza is offline Colza  New Zealand
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I did a quick shuffle of that original ML Voigt. I don't know much about folding enclosures, but I worked backward from the original and folded versions and it seems to make sense. The sketch is for a speaker 73mm deep, which seemed to work best to get a roughly square enclosure.

I will have to do some reading about these BIB speakers. I have downloaded the calculator but it is not well explained. xrk971, can you tell me more about how you flattened your BIB design?
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File Type: jpg 73 Deep ML_Voigt.jpg (63.2 KB, 162 views)
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Old 15th April 2014, 08:04 PM   #4
Colza is offline Colza  New Zealand
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Quick sim in HornResp for the above design.

Looks like it has potential?
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File Type: jpg 73 Deep ML_Voigt_HornResp.jpg (53.1 KB, 138 views)
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Old 15th April 2014, 08:13 PM   #5
xrk971 is online now xrk971  United States
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Not clear what the vent dimensions and where driver is located on your diagram. I would imagine a Voigt MLTL should get deeper bass extension though.
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Old 15th April 2014, 08:18 PM   #6
Colza is offline Colza  New Zealand
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Ah, yes sorry, the vent and driver arent on that sketch.

The proportions are the same as the original ML-Voigt design, so the driver is half way along the length, and the port is 38.1 diameter by 25.4 long

I have attached the hornresp file, it would be awesome if you could give it a quick check for me, I am new to hornresp too!
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File Type: txt ML_Voigt.txt (942 Bytes, 7 views)
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Old 15th April 2014, 10:58 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Colza View Post
I did a quick shuffle of that original ML Voigt.
Hi,

You be a lot better off increasing the width less and increasing
the height somewhat to compensate for the line shortening.

Its an arrangement that at the top works better the taller
and thinner the speaker is in terms of line discontinuity.

rgds, sreten.
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Last edited by sreten; 15th April 2014 at 11:18 PM.
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Old 15th April 2014, 11:37 PM   #8
sreten is offline sreten  United Kingdom
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Hi,

Consider the same Voigt box mirror imaged, so a square with
a |___\_/___| on the bottom, driver in the middle and ports
represented by the o's |__o_\_/_o__|. Reduce the port
diameter(s) by 0.71. The best way of halving depth IMO.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 16th April 2014 at 12:00 AM.
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Old 16th April 2014, 12:15 AM   #9
sreten is offline sreten  United Kingdom
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Hi,

Adding a bit of assymetry to the two halves
and the driver placement is not a bad idea.

rgds, sreten.
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Old 16th April 2014, 12:20 AM   #10
Colza is offline Colza  New Zealand
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Ok, can you explain further?

I maintained the S0 and S1 areas (2900 sq mm and 20325 sq mm respectively).

At any point along the length (approximated by the centre line on the sketch) the cross sectional area is the same as in the original design. This rule applies for the first section of the folded design (to the left of the partition) and the last section of the folded design (to the right of the partition).

The section in the centre (above the partition) is obviously a little confused since it doesnt really have walls, so its rather hard to estimate its cross section. The only point I can measure there is from the end of the partition to the top of the cabinet, and that has the correct cross sectional area for its particular length along the path.

If this is not the best way to fold such a design, I would love to know the correct method.

EDIT:
Sorry didnt see your reply. Hold on a moment while I think through your comments...

So essentially what you are saying is that 'confusing' section at the top where the path doubles back on itself is made less complicated when the box is tall rather than square. So I would be better off making the box non square, or doing the 'V' folding scheme instead?

Last edited by Colza; 16th April 2014 at 12:26 AM.
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