{"product_id":"listen-technologies-hls-2d-metal-loss-test-driver","title":"Listen Technologies HLS-2D – Metal Loss Test Driver","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Listen Technologies HLS-2D is a metal loss test driver used during hearing loop site survey to measure how much magnetic field strength a building's structure will absorb. Steel decking, reinforcement and structural framing all attenuate the field a hearing loop produces, and the loss varies enough between buildings that it cannot be assumed. This instrument quantifies it before the loop driver current rating is fixed.\u003c\/p\u003e\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eMetal loss is the variable that most often turns a hearing loop installation into a remedial job. A loop designed for a nominal floor area will fail its IEC 60118-4 measurement if the structure absorbs more field than the design assumed.\u003c\/p\u003e\u003cp\u003eThe HLS-2D drives a test loop on site so the resulting field can be measured against what the same loop would produce in free space. The difference is the metal loss, expressed in dB per octave, and it feeds directly into both the driver current rating and the metal loss correction setting on the installed driver.\u003c\/p\u003e\u003cp\u003eSurvey with the test driver, verify with a \u003ca href=\"https:\/\/creationnetworks.net\/products\/listen-technologies-tfsm01-fsm-field-strength-meter\"\u003efield strength meter\u003c\/a\u003e and its \u003ca href=\"https:\/\/creationnetworks.net\/products\/listen-technologies-acscc-cables-for-field-strength-meter\"\u003esignal connection cables\u003c\/a\u003e. Doing the survey first is considerably cheaper than discovering the loss after the loop conductor is buried in screed and the driver is on the wall.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantifies structural metal loss\u003c\/strong\u003e — Measures field absorption by steel decking, reinforcement and framing before design is fixed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInforms driver selection\u003c\/strong\u003e — Produces the dB per octave figure that determines current rating and correction setting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurvey stage instrument\u003c\/strong\u003e — Used before installation rather than after, when remedial work becomes expensive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairs with field strength measurement\u003c\/strong\u003e — Works alongside a field strength meter for full IEC 60118-4 commissioning workflow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAuditorium\u003c\/li\u003e\n\u003cli\u003eHouse of worship\u003c\/li\u003e\n\u003cli\u003eConference room\u003c\/li\u003e\n\u003cli\u003eBoardroom\u003c\/li\u003e\n\u003cli\u003eGovernment space\u003c\/li\u003e\n\u003cli\u003eTraining room\u003c\/li\u003e\n\u003cli\u003eMulti-purpose room\u003c\/li\u003e\n\u003cli\u003eCommercial meeting space\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;min-width:430px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:8px;border-bottom:1px solid #ddd;\"\u003eManufacturer\u003c\/th\u003e\n\u003ctd style=\"padding:8px;border-bottom:1px solid #ddd;\"\u003eListen Technologies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:8px;border-bottom:1px solid #ddd;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"padding:8px;border-bottom:1px solid #ddd;\"\u003eHLS-2D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:8px;border-bottom:1px solid #ddd;\"\u003eType\u003c\/th\u003e\n\u003ctd style=\"padding:8px;border-bottom:1px solid #ddd;\"\u003eMetal loss test driver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:8px;border-bottom:1px solid #ddd;\"\u003eApplication\u003c\/th\u003e\n\u003ctd style=\"padding:8px;border-bottom:1px solid #ddd;\"\u003eHearing loop site survey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:8px;border-bottom:1px solid #ddd;\"\u003ePurpose\u003c\/th\u003e\n\u003ctd style=\"padding:8px;border-bottom:1px solid #ddd;\"\u003eQuantifying structural metal loss prior to loop driver selection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003e\u003cem\u003eSpecifications sourced from the Listen Technologies product listing. Detailed electrical data is not published for this part.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat does metal loss actually mean?\u003c\/strong\u003e\u003cbr\u003e\nSteel in a building structure absorbs the magnetic field a hearing loop produces. The loss is expressed in dB per octave and rises with frequency, which is why loop drivers provide adjustable metal loss correction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy survey rather than estimate?\u003c\/strong\u003e\u003cbr\u003e\nLoss varies substantially between buildings depending on decking type, reinforcement density and framing. A loop designed on an assumed figure can fail its IEC 60118-4 measurement, and remedial work on a buried loop is expensive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen in the project is it used?\u003c\/strong\u003e\u003cbr\u003e\nAt survey stage, before the loop design is finalised and before any conductor is installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it replace a field strength meter?\u003c\/strong\u003e\u003cbr\u003e\nNo. The test driver quantifies loss during survey; the field strength meter verifies and certifies the finished installation. Both are needed for a complete workflow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich buildings need a survey?\u003c\/strong\u003e\u003cbr\u003e\nAny building with significant structural steel — composite floor decks, heavily reinforced slabs, steel frames. In practice that covers most modern commercial construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat warranty and support apply?\u003c\/strong\u003e\u003cbr\u003e\nWarranty terms are set by Listen Technologies. Contact Creation Networks for current terms and hearing loop survey guidance.\u003c\/p\u003e","brand":"Listen Technologies","offers":[{"title":"Default Title","offer_id":48228840833260,"sku":"HLS-2D","price":724.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/Listen-Tech-Logo.webp?v=1787635268","url":"https:\/\/creationnetworks.net\/products\/listen-technologies-hls-2d-metal-loss-test-driver","provider":"Creation Networks","version":"1.0","type":"link"}