Long pipe larger the better in diamiter (got mine for scrap jard)
Gas fittings for tube and to your gas bottles
2m drill bits
Step 1: Drilling the holes
Measure out 2m hols every 1.5cm along your pipe, make sure to leave a few inces from both ends of the pipe.
Clean up holes with meetle file.
When drilling such small holes you should poor some wanter on drill bit it makes such a difference.
Step 2: Diaphragm
Leave one side of tube blocked. When stretching rubber over sends make sure to tape down. The speaker with to put against this side of rubens tube.
Step 3: Gass connections
Reason for having two inlets in pipe was to improve on spread with filling up pipe with gas.
Step 4: Holding box
Step 5: Get it going
1. Connect the gas
2. Turn it on
3. Let the gass fill up and light gas.
You should see a contant level of light flames along the top. It its not level check level of pipe.
Connect up music and let it play.
Step 6: More
Also attached images of building.