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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 30th November 2014, 05:05 PM   #2531
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Quote:
Originally Posted by turk 182 View Post
i like the side firing horn for those "spatial like"effects...
foamcore's got nothin' on injected molded foam!!(i should be quiet and finish my cornu's)

i was looking at the other pic's foam cab's would make lightweight boom boxes wouldn't they
Here is a foam box with a lot of boom.
Light as Air Slot Loaded Band Pass Sub
Click the image to open in full size.
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Old 30th November 2014, 05:27 PM   #2532
turk 182 is offline turk 182  Canada
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showoff....as soon as i finish my cornu's (and the majority of the "honey-do" list) i'm gonna start my altec A7's outta foamcore!
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Old 12th December 2014, 07:09 AM   #2533
bolexsbm is offline bolexsbm  South Korea
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Just following in the footsteps of xrk971...

Hypercube speakers made with foamboard.

Karlson tubes glued to couple of tweeters sitting on top.

Sounds great considering the cheap 3" FR drivers used.
(costs about 3-4 bucks each? )

Anyway, thanks to all those at the hypercube thread for the information, inspiration and guidance!
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Old 12th December 2014, 12:07 PM   #2534
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Great work bolexsbm ! Neat to try a Karlson tube (what are you using for XO?) but a 3in full range probably doesn't need it. What are you using for the tweeter?
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Old 12th December 2014, 12:48 PM   #2535
Einric is offline Einric  United States
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I know that there have been discussions on other threads about mass loaded constrained layer cabinet damping.It has been noted that the mass of the damping must exceed the mass of the cabinet wall.
It seems to me that having a layer of dynamat or similar bonded between 2 layers of foam core would make an interesting experiment.
I wonder if there is any data about this application available.
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Old 12th December 2014, 12:55 PM   #2536
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
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Originally Posted by Einric View Post
I know that there have been discussions on other threads about mass loaded constrained layer cabinet damping.It has been noted that the mass of the damping must exceed the mass of the cabinet wall.
It seems to me that having a layer of dynamat or similar bonded between 2 layers of foam core would make an interesting experiment.
I wonder if there is any data about this application available.
I used a heavier but flexible material between two sheets of foam core and it makes a big difference. I have also added mass between two sheets of foam core via small dabs of heavy plumbers putty and that helps too. Not as much as a thick layer of latex caulking though. More info with measurements here:
Damping sheets - constrained layer damping.
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Old 12th December 2014, 01:10 PM   #2537
Tesserax is offline Tesserax  United States
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Outstanding work, bolexsbm. (I'm going to have to learn more about Karlson tubes.) I'm always to see someone willing to try the Hypercube design.
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Old 12th December 2014, 01:11 PM   #2538
Tesserax is offline Tesserax  United States
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Ah, if only I were a real typist.

Outstanding work, bolexsbm. (I'm going to have to learn more about Karlson tubes.) I'm always HAPPY to see someone willing to try the Hypercube design.
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Old 12th December 2014, 01:11 PM   #2539
Einric is offline Einric  United States
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Very Interesting!
The change is very dramatic.
I wonder how that compares to a simple 1/2" MDF or BB box without any added damping.
It looks like making desktop monitors from foam core with CLD is a VERY promising idea.
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Old 12th December 2014, 03:06 PM   #2540
bolexsbm is offline bolexsbm  South Korea
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xrk971,
Thanks! You gave me the inspiration to try making speakers out of FC.
You truly are the 'Godfather of Foamcore Speakers'

The drivers are actually no-name 2-inchers, not 3 inch ones(my mistake).
So the tweeter with Karlson tube helps a lot.
(Not the Hypercube's fault, I might add)

The tweeter is a Korean brand driver. A cheap one.

When I found out that the K-tube really sounds great, I started using the tube in almost every project. But I guess that's for another thread.

(It sounds almost as good as the QSC waveguide Patrick Bateman raves about- he says that the QSC measures best in the group of Econowave waveguides, and the K-tube comes very close - A close second?)

The XO is just a resistor and a capacitor that was from another project,
but it seems to work, so I'm just using it for the time being.


Tesserax,
Thank you for the great design!

Building the Hypercube was a fun and fast project with outstanding results.

I don't understand all the technical discussions you guys are engaging at the other thread, but having made a pair, I feel that the Hypercube concept is very cool, and I'm looking forward to build some more in the near future.
(I hope with better drivers and wood this time - and I'd also love to try 2-way, like xrk's version)

The speaker sounds very natural, and non fatiguing even after long periods of playback. Great for nearfield listening.

Thank you again for sharing your knowledge and design!
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