Rebreather Noise Profiles and Their Effect on Mapping Accuracy

CCRs are quieter than open-circuit — but they're not silent. EchoQuilt profiles your specific rebreather so its solenoid clicks and scrubber cycles don't masquerade as cave geometry.

A JJ-CCR on a 6m deep survey pass produces a measurable acoustic event every 2.1 to 3.4 seconds as the solenoid fires to add O2, plus a continuous broadband hiss from the scrubber canister as CO2-laden gas passes through Sofnolime. The rebreather's solenoid O2 injection and scrubber cycles produce periodic acoustic events that live in the 200 Hz to 4 kHz band. That overlaps exactly with the cave-geometry signal EchoQuilt needs to separate: flow through constrictions peaks around 400 Hz to 1.2 kHz, and bedding-plane reflections come back in the 600 Hz to 3 kHz band.