.pd-wrap { font-family: inherit; color: #111827; max-width: 680px; } .pd-wrap p { font-size: 15px; color: #374151; line-height: 1.75; margin: 0 0 14px; } .pd-section { margin-bottom: 28px; } .pd-section h2 { font-size: 16px; font-weight: 700; color: #111827; margin: 0 0 10px; padding-bottom: 8px; border-bottom: 1.5px solid #e5e7eb; } .pd-best-for { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; } .pd-tag { background: #f3f4f6; color: #374151; font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 20px; border: 1px solid #e5e7eb; } .pd-bullets { list-style: none; padding: 0; margin: 0; } .pd-bullets li { font-size: 14px; color: #374151; padding: 6px 0; display: flex; align-items: flex-start; gap: 10px; line-height: 1.5; border-bottom: 0.5px solid #f3f4f6; } .pd-bullets li:last-child { border-bottom: none; } .pd-bullets li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: #111827; flex-shrink: 0; margin-top: 6px; } .pd-cable { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; margin-top: 10px; } .pd-cable-card { background: #f9fafb; border: 1px solid #e5e7eb; border-radius: 8px; padding: 12px 14px; } .pd-cable-card .len { font-size: 15px; font-weight: 700; color: #111827; margin-bottom: 4px; } .pd-cable-card .use { font-size: 12px; color: #6b7280; line-height: 1.4; } .pd-spec-table { width: 100%; border-collapse: collapse; font-size: 13px; } .pd-spec-table tr { border-bottom: 0.5px solid #f3f4f6; } .pd-spec-table td { padding: 7px 0; vertical-align: top; } .pd-spec-table td:first-child { color: #6b7280; width: 50%; } .pd-spec-table td:last-child { font-weight: 600; color: #111827; } .pd-chain { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 10px; } .pd-chain-step { background: #f3f4f6; border: 1px solid #e5e7eb; border-radius: 6px; padding: 7px 12px; font-size: 12px; font-weight: 600; color: #374151; } .pd-chain-arrow { color: #9ca3af; font-size: 16px; } .pd-note { background: #fffbeb; border: 1px solid #fde68a; border-radius: 8px; padding: 12px 16px; font-size: 13px; color: #92400e; margin-top: 12px; } The CR30‑40 is Burns' best all-round hydrophone — wide enough in frequency response for whale vocalisations, dolphin social sounds, and general soundscape work, with a tough build designed for repeated field deployments in salt water. Best for Whale watching vessels Dolphin & whale research Underwater soundscapes Underwater filmmaking Environmental monitoring Education Why this model Active design with internal preamplifier — strong signal over practical cable lengths without external boosting 7 Hz – 30 kHz covers baleen whale song, dolphin whistles and social calls, vessel noise and general soundscape work Works with any recorder with sample rate of 96 kHz or above — including most field recorders and audio interfaces Depth-rated to 100 m — far beyond typical whale watching or research deployments Designed and built in Nelson Bay, NSW — direct support from the people who made it Which cable length should I choose? 5 m Shallow deployments. Kayak, dock, or small boat where recorder is close at hand. 10 m Most whale watching and small-boat research use. Gets below surface noise layer. 15 m Larger vessels or when the recorder is further from the deployment point. Need a different length? Custom cable lengths are available — contact us before ordering. Specifications Frequency range 7 Hz – 30 kHz Sensitivity –165 dB re 1V/µPa (nominal) Output impedance 150 Ω Depth rating 100 m Cable options 5 m / 10 m / 15 m Output connector 3.5mm TRS Power requirement External DC (via conditioning amp or Battery Box) Construction Australian-made, field-grade Example signal chain CR30‑40 hydrophone → HP-A1 conditioning amp → Recorder / interface / PA The HP-A1 provides power, gain, and filtering. For whale watching vessels connecting directly to a PA, the Battery Box provides standalone power without a separate amplifier. Need the ultrasonic range? If you're studying dolphin, porpoise echolocation clicks (up to 80 kHz), see the AquaEar CR80‑40. You'll also need a recorder with a sample rate of at least 192 kHz.
