Easy enough to simulate.
If it was mine, I'd spread the concrete mix up the side walls, too.
Claims about in-room performance are very room-dependent. Put it in a bigger room and it might suffer horribly.
Claims about performance improving with more current aren't really true. So long as you're not clipping the amplifier, the speaker doesn't care if it'll do 10A output or 1000A output.
In short, it's an 8" in a sealed box, and will have all the limitations associated with that.
Chris
If it was mine, I'd spread the concrete mix up the side walls, too.
Claims about in-room performance are very room-dependent. Put it in a bigger room and it might suffer horribly.
Claims about performance improving with more current aren't really true. So long as you're not clipping the amplifier, the speaker doesn't care if it'll do 10A output or 1000A output.
In short, it's an 8" in a sealed box, and will have all the limitations associated with that.
Chris
Hi Nenola,
I tried sourcing some wider diameter pvc pipe a while back but the lengths and prices were off putting. This bucket sub has made me investigate availability again though.
This guy wants $100 for these off cuts.....
PVC Storm Water Pipe - 300mm (actual is 313mm OD) | Building Materials | Gumtree Australia Bayswater Area - Morley | 1175022854
well over a two hour round trip too.
I tried sourcing some wider diameter pvc pipe a while back but the lengths and prices were off putting. This bucket sub has made me investigate availability again though.
This guy wants $100 for these off cuts.....
PVC Storm Water Pipe - 300mm (actual is 313mm OD) | Building Materials | Gumtree Australia Bayswater Area - Morley | 1175022854
well over a two hour round trip too.
What do you mean? Regarding standing waves, cylindrical shapes should be one of the better, no? Anyhow, at 100 hz the wavelenght is 3.44 meters. I highly doubt it would be an audible problem.
ewollowe: what about sonotubes? More than stiff enough and usually cheap to come by. As chris661 sait, it's just an 8" in a seal box really.
ewollowe: what about sonotubes? More than stiff enough and usually cheap to come by. As chris661 sait, it's just an 8" in a seal box really.
LF wavelengths are much much larger than the dimensions of the bucket. Not an issue.
Chris
Epifant, sonotube is also monstrously overpriced here and not something you'll get at your local hardware store like our lucky American chums.
I actually found a thread started by another poor unfortunate Perth diyaudio guy and he had no luck either.
However! A call to a company that deals with cardboard transport packaging gives me a small ray of hope I may be able to find something not hideously expensive.
Thanks for clearing up the standing waves issue guys.
I actually found a thread started by another poor unfortunate Perth diyaudio guy and he had no luck either.
However! A call to a company that deals with cardboard transport packaging gives me a small ray of hope I may be able to find something not hideously expensive.
Thanks for clearing up the standing waves issue guys.
Bit of a drive but a ray of sunshine nonetheless
Cardboard Tubes | Miscellaneous Goods | Gumtree Australia Swan Area - Malaga | 1175729454
Cardboard Tubes | Miscellaneous Goods | Gumtree Australia Swan Area - Malaga | 1175729454
That's a lot smaller and the tube is much longer than the height of the bucket. It also says on a closed tube the first standing wave is at 1/4 Lambda, let's assume the sub is used up to 100 Hz that means Lambda is 3,43m and 1/4 of it is 85cm. The first standing wave would be at at least 200 Hz and up, or in other words, no standing waves there.
That's ofcourse correct. But it's not only 12dB lower, it's not a planar wave because of the dimensions of the tube relative to the driver. If it would actually be a problem, that's also much easier to dampen or to 'break' by a 'chaotic/different length pattern' bottom wall or simply a tilted bottom which is very easily achieved by just tilting the bucket while pouring the cement. Acoustically it behaves like a box shaped speaker enclosure except the (much lower/missing) resonance across the diameter. So if you didn't encounter nasty standing waves in that range at a conventional shaped subwoofer, you won't have a problem there either.
You don't have to believe me, take a speaker and a bucket (1-2€ bei OBI) you can easily measure it yourself.
I stumbled across this thread, so I thought I would chime in. About a year ago I built a pair of the bucket subs. I used the Peerless 8” driver that was spec’ed and joint compound buckets that I sanded down and painted black. I did not use concrete on the inside because concrete has a habit of shrinking and I did not want it to loosen inside the bucket. I used USG brand Dura-Bond instead, reinforced with long screws zipped through the sides and used three 2” hard rubber feet for the base.
I was thoroughly impressed when I fired them up! They will not rock the house for home theater use but they have a nice musicality about them for regular music. Great project for not a lot of money
I was thoroughly impressed when I fired them up! They will not rock the house for home theater use but they have a nice musicality about them for regular music. Great project for not a lot of money
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In a subwoofer the dimensions are too small to support any standing waves.
Walls of a cyclindrical enclosure are very stiff… one only needs to worry about the caps.
dave
well, that's a problem then. Coils, capacitors, magnets, drivers and even cables are most of the time in some kind of cylindrical shape. But I get your point, music needs peaks.
well, that's a problem then. Coils, capacitors, magnets, drivers and even cables are most of the time in some kind of cylindrical shape. But I get your point, music needs peaks.
Yes, I said "speakers".
I should have said "speaker enclosures".
But maybe it`s the odd order harmonics the closed tube produces.
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