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Post by siggie on Aug 8, 2013 11:58:38 GMT -5
But that is a double headed design. Nothing like this. and the vast majority of any drum is still the heads, not the body. (for the most part unless designed that way) While I haven't done any measurements, I think this design should work. Ugly as hell but that is another topic.  I don't think many quality drums are made of flexible plastic. I've seen some nice sounding drumming performances with people playing nothing but upside down buckets, usually accompanied by break dancing. Siggie |
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Post by geebo on Aug 8, 2013 12:09:38 GMT -5
I don't think many quality drums are made of flexible plastic. I've seen some nice sounding drumming performances with people playing nothing but upside down buckets, usually accompanied by break dancing. Siggie But those aren't what I would call quality drums that a professional drummer would use in concert or studio. |
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Post by Deleted on Aug 8, 2013 12:46:10 GMT -5
For the true psychedelic experience you could also put it on your head and really jam to In-A-Gadda-Da-Vida!!!!!! The only saving grace in this entire 17 minute long thread! |
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Post by GTPlus on Aug 8, 2013 13:19:05 GMT -5
Think about it this way. How much pressure do you think it takes to raise 1 inch circular column of mercury of 1 inch in height? Is that enough "force" to flex a bucket? The answer is about .5 lbs per square inch. (1/2 not 5!) I doubt the bucket would care. Now why is this important? It takes about 165dB of sound pressure to do this. Wait, but isn't what you are calculating the pressure of the sound wave and not the air pressure inside the bucket? Wouldn't the sub motor force and internal pressures be far greater than outside spl? Just my basic view of this, but it seems strange guys build sub boxes out of 1.5" material, but a <2mm thick plastic bucket is good enough? |
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Post by geebo on Aug 8, 2013 13:23:47 GMT -5
Think about it this way. How much pressure do you think it takes to raise 1 inch circular column of mercury of 1 inch in height? Is that enough "force" to flex a bucket? The answer is about .5 lbs per square inch. (1/2 not 5!) I doubt the bucket would care. Now why is this important? It takes about 165dB of sound pressure to do this. Wait, but isn't what you are calculating the pressure of the sound wave and not the air pressure inside the bucket? Wouldn't the sub motor force and internal pressures be far greater than outside spl? Just my basic view of this, but it seems strange guys build sub boxes out of 1.5" material, but a <2mm thick plastic bucket is good enough? I'm sure SVS will see this and order a boatload of pickle buckets.  |
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Post by geebo on Aug 8, 2013 13:33:18 GMT -5
For the true psychedelic experience you could also put it on your head and really jam to In-A-Gadda-Da-Vida!!!!!! The only saving grace in this entire 17 minute long thread! Wow! That took me back a bit. I was surprised how much of it I remembered. The guitar player was 17 years old at the time. |
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bootman
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Post by bootman on Aug 8, 2013 13:38:58 GMT -5
Wait, but isn't what you are calculating the pressure of the sound wave and not the air pressure inside the bucket? Wouldn't the sub motor force and internal pressures be far greater than outside spl? Just my basic view of this, but it seems strange guys build sub boxes out of 1.5" material, but a <2mm thick plastic bucket is good enough? I'm sure SVS will see this and order a boatload of pickle buckets. Yes it is greater. I quoted 165dB as a reference for internal pressure. I doubt you are getting that high inside the bucket. (I honestly don't know what it is) |
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Post by geebo on Aug 8, 2013 13:49:57 GMT -5
I'm sure SVS will see this and order a boatload of pickle buckets. Yes it is greater. I quoted 165dB as a reference for internal pressure. I doubt you are getting that high inside the bucket. (I honestly don't know what it is) Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess.  |
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bootman
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Post by bootman on Aug 8, 2013 14:59:13 GMT -5
Yes it is greater. I quoted 165dB as a reference for internal pressure. I doubt you are getting that high inside the bucket. (I honestly don't know what it is) Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess. Ideal? No. It makes it too ugly for home use. But as far as a cylinder being an ideal shape for a sub? Hey, it works. |
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Post by blkman0072 on Aug 8, 2013 15:13:30 GMT -5
Now I'm lost here. Are we talking about a sub in a bucket only? I thought the bucket had concrete or a grout inside thus the walls would be stiffer than just a bucket. So a bucket with say half inch of grout on the inside would make the bucket not stretch at all. That's why if you look up hypertufa its lighter than concrete. Add that to bucket. Then its not an issue. Actually they have sub tubes made out of plastic. Use them in cars so now you would have to compare plastic used. You could make a sub that used a plastic box with bracing but people don't usually like plastic stuff as such in their house as audio equipment. That's like the home 2.1 box sys. People think they are cheap like most of the center channels for the tv are made of what?
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Post by geebo on Aug 8, 2013 15:18:53 GMT -5
Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess. Ideal? No. It makes it too ugly for home use. But as far as a cylinder being an ideal shape for a sub? Hey, it works. Nobody is questioning that a cylinder works (I don't think). This has more to do with the suitability of thin plastic to make one as compared to the much more rigid material that, say, SVS might use. I've worked with these buckets a lot. You can literally push the sides in by hand. Try that with any well respected sub. |
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Post by geebo on Aug 8, 2013 15:22:16 GMT -5
Now I'm lost here. Are we talking about a sub in a bucket only? I thought the bucket had concrete or a grout inside thus the walls would be stiffer than just a bucket. So a bucket with say half inch of grout on the inside would make the bucket not stretch at all. That's why if you look up hypertufa its lighter than concrete. Add that to bucket. Then its not an issue. Actually they have sub tubes made out of plastic. Use them in cars so now you would have to compare plastic used. You could make a sub that used a plastic box with bracing but people don't usually like plastic stuff as such in their house as audio equipment. That's like the home 2.1 box sys. People think they are cheap like most of the center channels for the tv are made of what? The concrete was only used to fill a few inches at the bottom. The plans specifically mentioned not to get any on the sides... |
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Post by flamingeye on Aug 8, 2013 15:34:34 GMT -5
Hey how about a 55 gallon drum and a 21"driver
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Post by geebo on Aug 8, 2013 15:43:35 GMT -5
Hey how about a 55 gallon drum and a 21"driver your talkin'! |
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Post by blkman0072 on Aug 8, 2013 15:47:51 GMT -5
Lol youtube has a custom bucket sub. Search it. In the vid tho its a downward facing sub with a pringles can used as a port tube running off house amp. I also saw a vid for a plexiglass speaker box. Of course most people use wood products due to workability. Particleboard can waste can be recycled and reused.
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Post by dracarys on Aug 8, 2013 16:37:30 GMT -5
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Flunk
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Post by Flunk on Aug 8, 2013 16:41:06 GMT -5
A serious build out of paper tubes which are quite cheap as well. Paper tubes |
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Post by Deleted on Aug 8, 2013 17:09:25 GMT -5
Geebo wrote: "Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess... I've worked with these buckets a lot. You can literally push the sides in by hand. Try that with any well respected sub."
Geebo, I'm not crackin' on ya, but you *clearly* do not understand basic physics. When you push in the sides of a bucket, you are exerting force at two specific points. And yes, it will deform at those two points. However, if you were to try to push in the bucket along its entire circumference simultaneously, you would be unable to get it to deflect even a little.
You're just gonna have to trust me, but this sub will not exhibit *any* deflection throughout its circumference. And, because the surface facing the driver is loaded with concrete, it will not flex too.
Frankly, this is a very ingenious design. And, considering the cost, it is a *very* high performance subwoofer. Please try and spend a little more time thinking things thru before you post...
-RW-
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Post by dracarys on Aug 8, 2013 17:14:58 GMT -5
Geebo wrote: "Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess... I've worked with these buckets a lot. You can literally push the sides in by hand. Try that with any well respected sub." Geebo, I'm not crackin' on ya, but you *clearly* do not understand basic physics. When you push in the sides of a bucket, you are exerting force at two specific points. And yes, it will deform at those two points. However, if you were to try to push in the bucket along its entire circumference simultaneously, you would be unable to get it to deflect even a little. You're just gonna have to trust me, but this sub will not exhibit *any* deflection throughout its circumference. And, because the surface facing the driver is loaded with concrete, it will not flex too. Frankly, this is a very ingenious design. And, considering the cost, it is a *very* high performance subwoofer. Please try and spend a little more time thinking things thru before you post... -RW- RW Did you look at the link I posted I thought the discussion of people who have tried it to be very interesting, I think it is worth someone trying it before knocking the idea. |
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Post by geebo on Aug 8, 2013 17:18:35 GMT -5
Geebo wrote: "Here is a simple question: Do you believe that a 1/16" to 1/8" thick mostly empty flexible plastic bucket is an ideal enclosure for a "hi-performance subwoofer"? I don't think it is so we'll just have to disagree I guess... I've worked with these buckets a lot. You can literally push the sides in by hand. Try that with any well respected sub." Geebo, I'm not crackin' on ya, but you *clearly* do not understand basic physics. When you push in the sides of a bucket, you are exerting force at two specific points. And yes, it will deform at those two points. However, if you were to try to push in the bucket along its entire circumference simultaneously, you would be unable to get it to deflect even a little. You're just gonna have to trust me, but this sub will not exhibit *any* deflection throughout its circumference. And, because the surface facing the driver is loaded with concrete, it will not flex too. Frankly, this is a very ingenious design. And, considering the cost, it is a *very* high performance subwoofer. Please try and spend a little more time thinking things thru before you post... -RW- Well, we'll just have to disagree, then. I don't believe flexible thin plastic would make a good subwoofer enclosure. And neither do virtually all cylindrical sub makers out there. Another thing, those buckets are known to crack after they age a bit. I've seen it a lot. They get brittle after losing their flexibility. Have you ever seen a high speed video of a wine glass vibrating? It does not uniformly pulse in and out. |
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