{"product_id":"aquaear-cr30-40","title":"AquaEar CR30‑40 — Wideband Audio Hydrophone (7 Hz–30 kHz)","description":"\u003c!-- ============================================================\n     BURNS HYDROPHONE SYSTEMS — CR30-40 Product Description\n     \n     HOW TO UPDATE IN SHOPIFY:\n     1. Go to Products → AquaEar CR30-40\n     2. In the Description field, click the \"\u003c\u003e\" source button\n     3. Replace all existing content with this HTML\n     4. Click Save\n     ============================================================ --\u003e\n\u003cstyle\u003e\n  .pd-wrap { font-family: inherit; color: #111827; max-width: 680px; }\n  .pd-wrap p { font-size: 15px; color: #374151; line-height: 1.75; margin: 0 0 14px; }\n  .pd-section { margin-bottom: 28px; }\n  .pd-section h2 { font-size: 16px; font-weight: 700; color: #111827; margin: 0 0 10px; padding-bottom: 8px; border-bottom: 1.5px solid #e5e7eb; }\n  .pd-best-for { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }\n  .pd-tag { background: #f3f4f6; color: #374151; font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 20px; border: 1px solid #e5e7eb; }\n  .pd-bullets { list-style: none; padding: 0; margin: 0; }\n  .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; }\n  .pd-bullets li:last-child { border-bottom: none; }\n  .pd-bullets li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: #111827; flex-shrink: 0; margin-top: 6px; }\n  .pd-cable { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; margin-top: 10px; }\n  .pd-cable-card { background: #f9fafb; border: 1px solid #e5e7eb; border-radius: 8px; padding: 12px 14px; }\n  .pd-cable-card .len { font-size: 15px; font-weight: 700; color: #111827; margin-bottom: 4px; }\n  .pd-cable-card .use { font-size: 12px; color: #6b7280; line-height: 1.4; }\n  .pd-spec-table { width: 100%; border-collapse: collapse; font-size: 13px; }\n  .pd-spec-table tr { border-bottom: 0.5px solid #f3f4f6; }\n  .pd-spec-table td { padding: 7px 0; vertical-align: top; }\n  .pd-spec-table td:first-child { color: #6b7280; width: 50%; }\n  .pd-spec-table td:last-child { font-weight: 600; color: #111827; }\n  .pd-chain { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 10px; }\n  .pd-chain-step { background: #f3f4f6; border: 1px solid #e5e7eb; border-radius: 6px; padding: 7px 12px; font-size: 12px; font-weight: 600; color: #374151; }\n  .pd-chain-arrow { color: #9ca3af; font-size: 16px; }\n  .pd-note { background: #fffbeb; border: 1px solid #fde68a; border-radius: 8px; padding: 12px 16px; font-size: 13px; color: #92400e; margin-top: 12px; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"pd-wrap\"\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003cp\u003eThe 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.\u003c\/p\u003e\n\n    \u003ch2\u003eBest for\u003c\/h2\u003e\n    \u003cdiv class=\"pd-best-for\"\u003e\n      \u003cspan class=\"pd-tag\"\u003eWhale watching vessels\u003c\/span\u003e\n      \u003cspan class=\"pd-tag\"\u003eDolphin \u0026amp; whale research\u003c\/span\u003e\n      \u003cspan class=\"pd-tag\"\u003eUnderwater soundscapes\u003c\/span\u003e\n      \u003cspan class=\"pd-tag\"\u003eUnderwater filmmaking\u003c\/span\u003e\n      \u003cspan class=\"pd-tag\"\u003eEnvironmental monitoring\u003c\/span\u003e\n      \u003cspan class=\"pd-tag\"\u003eEducation\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003ch2\u003eWhy this model\u003c\/h2\u003e\n    \u003cul class=\"pd-bullets\"\u003e\n      \u003cli\u003eActive design with internal preamplifier — strong signal over practical cable lengths without external boosting\u003c\/li\u003e\n      \u003cli\u003e7 Hz – 30 kHz covers the full range of baleen whale song and dolphin social whistles\u003c\/li\u003e\n      \u003cli\u003eWorks with any recorder at 96 kHz or above — including most field recorders and audio interfaces\u003c\/li\u003e\n      \u003cli\u003eDepth-rated to 100 m — far beyond typical whale watching or research deployments\u003c\/li\u003e\n      \u003cli\u003eDesigned and built in Nelson Bay, NSW — direct support from the people who made it\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003ch2\u003eWhich cable length should I choose?\u003c\/h2\u003e\n    \u003cdiv class=\"pd-cable\"\u003e\n      \u003cdiv class=\"pd-cable-card\"\u003e\n        \u003cdiv class=\"len\"\u003e5 m\u003c\/div\u003e\n        \u003cdiv class=\"use\"\u003eShallow deployments. Kayak, dock, or small boat where recorder is close at hand.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pd-cable-card\"\u003e\n        \u003cdiv class=\"len\"\u003e10 m\u003c\/div\u003e\n        \u003cdiv class=\"use\"\u003eMost whale watching and small-boat research use. Gets below surface noise layer.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pd-cable-card\"\u003e\n        \u003cdiv class=\"len\"\u003e20 m\u003c\/div\u003e\n        \u003cdiv class=\"use\"\u003eLarger vessels or when the recorder is further from the deployment point.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pd-cable-card\"\u003e\n        \u003cdiv class=\"len\"\u003e50 m\u003c\/div\u003e\n        \u003cdiv class=\"use\"\u003eDeep water research, long tow setups, or when the wheelhouse is far from the stern.\u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pd-note\"\u003eNeed a different length? Custom cable lengths are available — contact us before ordering.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003ch2\u003eSpecifications\u003c\/h2\u003e\n    \u003ctable class=\"pd-spec-table\"\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e7 Hz – 30 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e–165 dB re 1V\/µPa (nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOutput impedance\u003c\/td\u003e\n\u003ctd\u003e150 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDepth rating\u003c\/td\u003e\n\u003ctd\u003e100 m\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCable options\u003c\/td\u003e\n\u003ctd\u003e5 m \/ 10 m \/ 20 m \/ 50 m\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOutput connector\u003c\/td\u003e\n\u003ctd\u003e3.5mm TRS\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePower requirement\u003c\/td\u003e\n\u003ctd\u003eExternal DC (via conditioning amp or Battery Box)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eAustralian-made, field-grade\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003ch2\u003eExample signal chain\u003c\/h2\u003e\n    \u003cdiv class=\"pd-chain\"\u003e\n      \u003cdiv class=\"pd-chain-step\"\u003eCR30‑40 hydrophone\u003c\/div\u003e\n      \u003cdiv class=\"pd-chain-arrow\"\u003e→\u003c\/div\u003e\n      \u003cdiv class=\"pd-chain-step\"\u003eHP-A1 conditioning amp\u003c\/div\u003e\n      \u003cdiv class=\"pd-chain-arrow\"\u003e→\u003c\/div\u003e\n      \u003cdiv class=\"pd-chain-step\"\u003eRecorder \/ interface \/ PA\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cp style=\"margin-top:12px; font-size:13px; color:#6b7280;\"\u003eThe 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"pd-section\"\u003e\n    \u003ch2\u003eNeed the ultrasonic range?\u003c\/h2\u003e\n    \u003cp\u003eIf you're studying dolphin or porpoise echolocation clicks (up to 80 kHz), see the \u003ca href=\"\/products\/aquaear-cr80-40\" style=\"color:#111827;\"\u003eAquaEar CR80‑40\u003c\/a\u003e. You'll also need a recorder capable of at least 192 kHz sample rate.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Burns Hydrophone Systems","offers":[{"title":"5m","offer_id":51492082385028,"sku":"CR30-40-5M","price":1500.0,"currency_code":"AUD","in_stock":true},{"title":"10m","offer_id":51492082417796,"sku":"CR30-40-10M","price":1600.0,"currency_code":"AUD","in_stock":true},{"title":"20m","offer_id":51492082450564,"sku":"CR30-40-20M","price":1800.0,"currency_code":"AUD","in_stock":true},{"title":"50m","offer_id":51492082483332,"sku":"CR30-40-50M","price":2400.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/3223\/7188\/files\/Aquaear_CR30-40.png?v=1771015314","url":"https:\/\/www.burnselectronics.com.au\/products\/aquaear-cr30-40","provider":"Burns Hydrophone Systems","version":"1.0","type":"link"}