I dropped a couple of hydrophones in a funky puddle at Gum Grove Park in Seal Beach and was surprised at what I could hear. The video has 2 sound files layered on top of each other but no other editing.
Hydrophones For Sale
Hydrophone – 40ft
High-quality piezo cylinder and OPA-based impedance convertor encased in polyurethane
Specs:
Cable: Canare L-2T2S – 40ft
Connector: Neutrik NC3MXX XLR
Piezo: Steminc Cylinder
Circuit: OPA Alice mini
Required Power: 48v
Built to order – 30 day turnaround time
Built based on the fantastic Instructable and OPA Alice circuit designed by Jules Ryckebusch