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Old 19th December 2012, 04:44 AM   #41
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Fibreglassing over foam?
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Old 19th December 2012, 01:55 PM   #42
tb46 is offline tb46  United States
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Hi Forsman,

I like the styrofoam, easy to cut and shape. Old newspaper scraps (or Raufasertapete?) soaked in wallpaper paste should reinforce the surface just fine.

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Old 19th December 2012, 09:31 PM   #43
Forsman is offline Forsman  Sweden
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Do I think what you think? In that case I'm not sure it will work. The density/stiffness of the styrofoam doesn't look 'experimental correction' enough....
I think you do.

And I have the same doubt about the stiffness of the material.

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Originally Posted by mattlong8 View Post
Is it expanded or extruded polystyrene?
That I dont know. It is the cheapest sort made for insulation in construction works.

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Originally Posted by bitSmasher View Post
Fibreglassing over foam?
Could be an option but I am trying to find a simpler solution.

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Originally Posted by tb46 View Post
Old newspaper scraps (or Raufasertapete?) soaked in wallpaper paste should reinforce the surface just fine.
That might be the simpler solution I am looking for.

/Forsman
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Old 19th December 2012, 10:45 PM   #44
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Fiberglassing over Styrofoam ?
Could be an option but I am trying to find a simpler solution.

/Forsman
The usual Polyester resin used in "fiberglass" eats Styrofoam in seconds .

Boat and surfboard manufacturers use a special foam and epoxy, as did Sound Image for their speaker cabinets.
Very light, very stiff, very expensive .
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Old 20th December 2012, 06:08 AM   #45
Forsman is offline Forsman  Sweden
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- Thanks for the warning.
That’s one reason to try a simpler way of creating a hard surface in an easier manner. I have thought of Divinycell and/or Epoxy but Epoxy is pretty toxic and thus a bit hard to work with. I occasionally use both Polystyrene and Epoxy to mend boats but for this trial I need a simple way of creating a cone volume compensation that is just good enough. Maybe it will suffice with Raufasertapete or even just a layer of paint, at least at low volume.

/Forsman
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Last edited by Forsman; 20th December 2012 at 06:08 AM. Reason: smily
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Old 20th December 2012, 06:21 AM   #46
Djim is offline Djim  Netherlands
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Quote:
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...........try a simpler way of creating a hard surface........Epoxy..... toxic........hard to work with......... I need a simple way of creating a cone volume compensation.......
Maybe wood is an idea It's hard by itself, it takes 10 minutes to make 3 shapes and voilŠ........
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Old 20th December 2012, 10:49 AM   #47
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Polystyrene and epoxy are compatible. Oh and extruded is stronger than expanded.
good luck.

-Matt
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Old 25th February 2013, 05:21 PM   #48
Forsman is offline Forsman  Sweden
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I havenít been able to compensate for cone volume yet but I do have tried with some damping at 170 cm from S1 with promising result.

Measurement at mouth. Horn placed in a corner in a large open floor. 6 db/oct smoothing.

Click the image to open in full size.

/Forsman
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Old 4th March 2013, 08:42 PM   #49
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/Forsman
So call me lazy, but what's the internal width of the cabinet? It looks like there's a lot of space on either side of the driver.

tnx,
gs
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Old 4th March 2013, 09:59 PM   #50
Forsman is offline Forsman  Sweden
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Internal width is 42 cm / 16.54 in.

Kind regards
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Last edited by Forsman; 4th March 2013 at 10:00 PM. Reason: spelling
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