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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 23rd May 2020, 05:55 PM   #3151
georgemarousek is offline georgemarousek  United States
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Thanks for the comment, now on to get some foam board.

Question on the construction of the foam cabinet. I get using a hot glue gun to assemble the horn, back, front, top and bottom to one side but what do you use to seal on the other side, Liquid Nails?

George
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Old 23rd May 2020, 06:11 PM   #3152
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Hot melt glue if you are fast! Or white PVA glue works well too and is clear. Liquid Nails is brown and makes a mess. Only use the non VOC version.
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Old 23rd May 2020, 08:07 PM   #3153
georgemarousek is offline georgemarousek  United States
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Forgot about PVA, thanks

George
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Old 31st May 2020, 05:04 PM   #3154
georgemarousek is offline georgemarousek  United States
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When use used the Mr Clean magic eraser as a damping material did you use them straight out of the box (with the "soap" still in it) or did you wash and dry them?

Have decided on the 0.40X design for my first build with foam. Have build 17 MDF speakers so this will be a new experience!

George
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Old 31st May 2020, 05:46 PM   #3155
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
I don't think they ever have soap in them. They only need water to remove stuff like wet sanding. Get the bags of 100 sponges from China for $10 if you can wait.
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Old 2nd June 2020, 06:19 PM   #3156
georgemarousek is offline georgemarousek  United States
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Sorry for so many questions but I would like the enclosuers look nice and not like a kindergardner glued them.

I get it that the glued edge of the first side is all from the inside so that edge looks nice and clean. But what is recommended to glue the other side on? Do you just run a bead of PVA along the edge of the side and a fine thread of glue on the upright pieces and assume that that is adequate?

George
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Old 2nd June 2020, 06:45 PM   #3157
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Yes, and place lots of books on top to clamp them all down while waiting to dry. White PVA is clear and doesn't leave a visible trace. You can cover the foam with fabric or even wood veneer if you like.

Here is an example of fabric covering:
Click the image to open in full size.
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Old 6th June 2020, 09:13 PM   #3158
georgemarousek is offline georgemarousek  United States
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In brousing the thread I picked up the information that the Karlsonator is a tapered quarter tube with an acoustic lens. Any information regarding the theory of the acoustic lens and how it behaves and performs the task it does?

George
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Old 7th June 2020, 12:55 AM   #3159
xrk971 is offline xrk971  United States
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Much of the theory on TQWT can be found in other websites like Quarter Wavelength Loudspeaker Design

Theory Karlson acoustic lens and model is in this thread:

A Speaker that Kicks Butt in Large Spaces

Karlsonator is close to mild tapped horn in some ways - with a weakly coupled bandpass output coupler with the K aperture.
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Old 7th June 2020, 02:59 AM   #3160
BP1Fanatic is offline BP1Fanatic  United States
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That enclosure came out nice, X!
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