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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 16th April 2018, 01:41 PM   #2971
silasmellor is offline silasmellor  Denmark
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Foam Core Board Speaker Enclosures?
I've only drilled it, it gets very messy quickly! If it is for driver cutouts i would just do several passes slowly with a sharp knife to keep the circle neat. If you need rebates, sandwich two layers of foamcore and cut the outer face according to the driver outer diameter. That's what i did for the Mar-Ken's and it worked nicely.
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Old 16th April 2018, 03:11 PM   #2972
gkh is offline gkh  Austria
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Silasmellor,
thank you for your quick response!
What do you mean by "it gets very messy quickly"?
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Old 16th April 2018, 03:41 PM   #2973
Cal Weldon is offline Cal Weldon  Canada
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Foam Core Board Speaker Enclosures?
If it's anything like cutting it with a power saw, he means that little pieces start flying everywhere and the cut edge is as jagged as sharks teeth.
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Old 16th April 2018, 03:49 PM   #2974
Cal Weldon is offline Cal Weldon  Canada
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Foam Core Board Speaker Enclosures?
Quote:
Originally Posted by xrk971 View Post
how much mass (if any) to add to the PR.
Hi X,
Thanks very much as always for your offer(s).
I think at this point I am simply winging it. I have a pretty good idea about the required box and also have a good feeling about the PR's. I wasn't looking to ruin the woofer by altering it so I looked around and found these. Just had to blow the dust off them. The size, cone travel and mass all seem about right. I am hoping to get these together in the next day or so and will know rather quickly if they are a success. They won't be a permanent speaker, just another Calsperiment.

Hope other things in your life are progressing as you hoped.
Cheers.
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Old 16th April 2018, 04:25 PM   #2975
silasmellor is offline silasmellor  Denmark
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Foam Core Board Speaker Enclosures?
Exactly what Cal said
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Old 16th April 2018, 04:45 PM   #2976
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
The two layer rebate is a great trick and what I do all the time. FWIW, the 3/16in thick foam core in the US is exactly the right depth to flush mount the bezel of most drivers: A7.3, 10F, TC9FD, RS100, B80, etc.
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Old 16th April 2018, 06:43 PM   #2977
Cal Weldon is offline Cal Weldon  Canada
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Foam Core Board Speaker Enclosures?
I won't be able to rebate the drivers as they are mounted to laminate flooring.

I also noticed my knife cutting skill goes way downhill when I want to see the results quickly, so caulking is going to be my friend here.
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Old 17th April 2018, 03:41 PM   #2978
gkh is offline gkh  Austria
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Silasmellor, Cal:
Flying dust shouldn't be a problem as this small CNC router has an integrated dust extraxtor
Jagged edges on the other hand would be a real problem, but there are router bits on the market wth more than two cutting edges, and with up to 24.000rpm I really wonder...

I came up with this idea as my right hand is nearly without any feeling, and my cuts show this more than clearly.
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Old 17th April 2018, 03:47 PM   #2979
jwjarch is offline jwjarch  United States
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GKH,
I've had success routing 1/2" foam-core with a spiral cutting bit and a Jasper circle jig. The edges were perfect. I also had my dust collector on to keep a good percentage of the dust down. I can't speak for the 3/16" foam core but I think it's worth a try. Material is cheap.
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Old 17th April 2018, 03:49 PM   #2980
gkh is offline gkh  Austria
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Jwjarch,

could you please post a picture of your router bit?
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