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Post by MikeMusic on Feb 11, 2022 14:36:07 GMT
Be interested to hear how they sound
Don't think they would work that well
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Post by karatestu on Feb 11, 2022 20:04:50 GMT
I isolated my 2" cone tweeters today. I did have them screwed to a rounded over ring of plywood which was glued to the front of the sphere. I removed this and the tweeter fit inside the cut out with a couple of mm gap all the way around. As this is only an experiment on my as yet prototype I got out the trusty gaffa tape and did this.  So now the tweeters don't directly touch their spherical enclosures, only via the gaffa tape. Well what can I say other than I am well impressed with what this has done. It's like more of the same as when I isolated the whole speaker from the floor with an inner tube. This will definitely be pursued further. |
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Post by wannarock2 on Feb 11, 2022 23:08:53 GMT
Hans likes speaker isolation.
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Post by MartinT on Feb 11, 2022 23:47:17 GMT
Remarkably inexpensive solution.
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Post by karatestu on Feb 12, 2022 8:47:06 GMT
Remarkably inexpensive solution. Gaffa tape or Isoacoustics ? |
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Post by MartinT on Feb 12, 2022 11:33:41 GMT
IsoAcoustics.
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Post by karatestu on Feb 12, 2022 11:42:37 GMT
Still too much money for my liking. Can't beat an inner tube for value for money  |
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Post by MartinT on Feb 12, 2022 12:02:06 GMT
I realise they're pricy, but I was comparing them with the Podiums that are very pricy.
Interesting that in the video the Podiums are still claimed to perform better. As they should do.
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Post by jandl100 on Feb 12, 2022 13:05:39 GMT
I use Hudson Bigfoot silicon rubber footers between an Auralex Pro isolation platform and my 45kg speakers.
The Hudson are available from Amazon and aren't vastly more expensive than an inner tube!... £48 for 8.
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Post by karatestu on Feb 12, 2022 14:42:34 GMT
Here's a pic of my mocked up speaker idea with a 16" inner tube under the base plate. I say under but it is only just. The tube acts like a bumper when I turn the base plate upside down so the large roundover faces down. I quite like how it worked out.  A close up  |
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Post by karatestu on Feb 12, 2022 14:47:14 GMT
I think it could be even better if the roundover is routed to be concave as that will follow the curve of the inner tube. Also I need to make the inner tube more attractive so thinking about spraying it black with plastidip. If that stays flexible and doesn’t change the isolation properties then it's winner winner chicken dinner.
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Post by MartinT on Feb 12, 2022 14:52:23 GMT
Looks good as it is, Stu. The curvy stool is inspired and seems to fit perfectly.
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Post by karatestu on Feb 12, 2022 14:52:27 GMT
Here is a little YouTube video of my speaker bouncing around on the inner tube. Forgive my heavy breathing.
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Post by MartinT on Feb 12, 2022 14:53:42 GMT
Looks to be around 1Hz, the same as mine.
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Post by petea on Feb 12, 2022 15:32:45 GMT
"Forgive my heavy breathing". Essential when you're using inner tubes!  |
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Post by karatestu on Feb 12, 2022 20:34:10 GMT
Looks good as it is, Stu. The curvy stool is inspired and seems to fit perfectly. I wanted an hour glass shaped stand not only because it looked good but for a technical reason as well. Harry Olson's groundbreaking work showed how the enclosure shape had such a bearing on how smooth the baffle loss transition frequency range is. Of the shapes he measured the sphere came out the best. But a teardrop shape is slightly better like in the lower pic in the diagram below.  I think the hourglass shape achieves that once the top has been trimmed down a bit so the sphere meets the stand in a smooth uninterrupted way. Then it gets wider at the bottom where it blends in to the floor quite smoothly. As the mid bass is up firing I believe what is under it will make a difference to how smooth the baffle step transition will be and the smoother it is the less re radiation there will be due to the lack of abrupt changes in shape (edges). That's what this is all about. In my view you can take average performing drivers and put them in an enclosure that will show up expensive drivers bunged in a less than ideal enclosure. The only thing I have to watch is the possible internal resonance of a spherical, mid bass enclosure. Don't worry, I have a few ideas that will deal with that IF it turns out to be a problem. Stay tuned folks. |
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📶NAS > Gustard x26p DAC > Benchmark LA4 Pre-Amp > NAD M22-V2 Amplifier > Revel F228Be Speakers
