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Post by indiehouse on Jul 5, 2021 8:58:18 GMT -6
I took some measurements and I’m having doubts that these are the right fit for the Atomics. The top plate measures 8” x 6.5”, but my Atomics measure 14” x 12.5”. I’m not sure that the plate is big enough.
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Post by indiehouse on Jul 5, 2021 8:59:26 GMT -6
Mass lowers the sympathetic vibration frequency, but hardness can transfer higher frequencies. It's a balance. Sand has the benefit of mass but without the hardness and the small particles dissipate vibrations. Then cinder blocks wouldn’t be ideal for preventing the transfer of higher frequencies?
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ericn
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Balance Engineer
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Post by ericn on Jul 5, 2021 9:00:51 GMT -6
I took some measurements and I’m having doubts that these are the right fit for the Atomics. The top plate measures 8” x 6.5”, but my Atomics measure 14” x 12.5”. I’m not sure that the plate is big enough. It’s not, that’s the problem with big cabinets and why finding a good local welder is worth his or her weight in gold!
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Post by svart on Jul 5, 2021 9:02:04 GMT -6
Mass lowers the sympathetic vibration frequency, but hardness can transfer higher frequencies. It's a balance. Sand has the benefit of mass but without the hardness and the small particles dissipate vibrations. Then cinder blocks wouldn’t be ideal for preventing the transfer of higher frequencies? Tap on them.. solid loud *tink* sound, right? Tap on sand.. just a dull thump.. that frequency of the tink is the frequency that will be transferred.
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Post by indiehouse on Jul 5, 2021 9:08:07 GMT -6
Then cinder blocks wouldn’t be ideal for preventing the transfer of higher frequencies? Tap on them.. solid loud *tink* sound, right? Tap on sand.. just a dull thump.. that frequency of the tink is the frequency that will be transferred. I wouldn't think cinder blocks would *tink* if I tapped on them, but I haven't tried.
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Post by svart on Jul 5, 2021 9:09:56 GMT -6
Tap on them.. solid loud *tink* sound, right? Tap on sand.. just a dull thump.. that frequency of the tink is the frequency that will be transferred. I wouldn't think cinder blocks would *tink* if I tapped on them, but I haven't tried. I have. They're heavy but very hard. You could try layering the ones with no holes with sand in between, or possibly filling the ones with holes with sand. Hope your floor can handle the weight!
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Post by indiehouse on Jul 5, 2021 9:10:11 GMT -6
This is my DIY stands now. They wobble pretty easily, but that could be because they are sitting on this sh**ty carpet (another project for another day). I'm thinking spikes might help, but I'm not certain. I'm also not certain if they are inert enough for these heavy Atomics.
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Post by indiehouse on Jul 5, 2021 9:10:52 GMT -6
I wouldn't think cinder blocks would *tink* if I tapped on them, but I haven't tried. I have. They're heavy but very hard. You could try layering the ones with no holes with sand in between, or possibly filling the ones with holes with sand. Hope your floor can handle the weight! I'm in the basement.
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Post by indiehouse on Jul 5, 2021 9:15:08 GMT -6
Side question about speaker height. Tell me if I got this right. I want to avoid sitting in the listening position height that is center between ceiling and floor, correct? And that height is approx midpoint between woofer and tweeter, correct?
I currently have a drop ceiling. So, should my measurement be from floor to drop ceiling? Or floor to bottom joist above? Or floor to subfloor?
Tweeter/woofer midpoint is approx 45", floor to drop ceiling height is approx 85".
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ericn
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Post by ericn on Jul 5, 2021 9:31:55 GMT -6
Side question about speaker height. Tell me if I got this right. I want to avoid sitting in the listening position height that is center between ceiling and floor, correct? And that height is approx midpoint between woofer and tweeter, correct? I currently have a drop ceiling. So, should my measurement be from floor to drop ceiling? Or floor to bottom joist above? Or floor to subfloor? Tweeter/woofer midpoint is approx 45", floor to drop ceiling height is approx 85". Your not going to like this answer, but the rule is there are no rules. Position including height is dependent on the speaker design and listener height and preferences. The only way to find it is move them around. When I bought a new couch I spent 3 weeks trying to get the speaker height right, of course ironically it was the height I started with.
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Post by svart on Jul 5, 2021 9:41:39 GMT -6
Side question about speaker height. Tell me if I got this right. I want to avoid sitting in the listening position height that is center between ceiling and floor, correct? And that height is approx midpoint between woofer and tweeter, correct? I currently have a drop ceiling. So, should my measurement be from floor to drop ceiling? Or floor to bottom joist above? Or floor to subfloor? Tweeter/woofer midpoint is approx 45", floor to drop ceiling height is approx 85". Wives tale. Just put it where it works the best. Translation is what you're after, not best measurements
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Post by Tbone81 on Jul 5, 2021 12:38:51 GMT -6
Tap on them.. solid loud *tink* sound, right? Tap on sand.. just a dull thump.. that frequency of the tink is the frequency that will be transferred. I wouldn't think cinder blocks would *tink* if I tapped on them, but I haven't tried. Yeah but I'm sure you've heard the high freq reflection off a cinder block wall, no? That would be the "tink" Svart is talking about. Another option would be to cover the cinder blocks with some type of high freq damping. Thick cotton batting from an upholstery store, then wrapped in fabric should kill any reflections I would think. But as for energy transfer from coupling...I have no idea. I defer to others on that. For me, I don't really worry about.
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Post by Tbone81 on Jul 5, 2021 12:40:03 GMT -6
Side question about speaker height. Tell me if I got this right. I want to avoid sitting in the listening position height that is center between ceiling and floor, correct? And that height is approx midpoint between woofer and tweeter, correct? I currently have a drop ceiling. So, should my measurement be from floor to drop ceiling? Or floor to bottom joist above? Or floor to subfloor? Tweeter/woofer midpoint is approx 45", floor to drop ceiling height is approx 85". Wives tale. Just put it where it works the best. Translation is what you're after, not best measurements +1 to that. I've done extensive measurements of my setup with REW, and one revelation was that flatest curve didn't sound the "best" to me. Turns out I like things to sound a little more "fun".
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ericn
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Post by ericn on Jul 5, 2021 13:21:05 GMT -6
I wouldn't think cinder blocks would *tink* if I tapped on them, but I haven't tried. Yeah but I'm sure you've heard the high freq reflection off a cinder block wall, no? That would be the "tink" Svart is talking about. Another option would be to cover the cinder blocks with some type of high freq damping. Thick cotton batting from an upholstery store, then wrapped in fabric should kill any reflections I would think. But as for energy transfer from coupling...I have no idea. I defer to others on that. For me, I don't really worry about. a Filling the inside would go further. The 2 voids in a cinder block act like a pipe in a pipe organ. If you stack them so that the void of one is on top of the other you can hear / measure the “tink” tuning change. If your thinking, well I’ll just put them on there sides remember that’s not how they are designed to take the load.
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Post by indiehouse on Jul 5, 2021 13:31:31 GMT -6
Urgh.
I wonder if I can overbuild a pair of these DIY sand filled PVC stands. Maybe a 3 pole design. Or just bite the bullet and get a pair of sound anchors.
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ericn
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Post by ericn on Jul 5, 2021 14:00:59 GMT -6
Urgh. I wonder if I can overbuild a pair of these DIY sand filled PVC stands. Maybe a 3 pole design. Or just bite the bullet and get a pair of sound anchors. 3 or 4 post would be great, of course remember Home Depot and Lowes will also cut and thread iron pipe to length. A couple of flanges 19mm ply on top and bottom fill with sand, some big screws on the bottom as spikes you have poor mans Sound Anchors. Why steel ? We used steel pipe all the time in the theater to build structures unlike PVC it can take quite a load.
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