H2a XLR Hydrophone
I did a quick test today to see how a bike pump would generate bubbles underwater and if the sounds would be any different from the compressed air cans. The stream of air is slower and lasts for a shorter time with a bike pump, but it is good for producing a controlled stream of larger bubbles. I will have a good listen to the material recorded and work out if it is worth doing a bigger session on this.
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Stephan Schütze has been recording sounds for over twenty years. This journal logs his thoughts and experiences