{"product_id":"18sound-speaker-21-21id-2ohms-aally-47774","title":"18SOUND Speaker 21\" 21ID 2OHMS","description":"\u003cp\u003e\u003cspan\u003eThe 21iD is an 21 inch neodymium high performance subwoofer. The loudspeaker has been optimized for vented and bandpass subwoofer cabinet designs and is recommended to use a Class D or iPal (tm*) amplifier able to deliver 3600 Watt program power without clipping. Eighteen Sound engineers have obtained the best possible results with today's available materials in terms of clean and undistorted LF reproduction at a ultra high SPL, with the lowest possible power compression figure. The transducer design features include a large displacement suspension system specifically designed for matching the composite fiber reinforced, straight ribbed cone. Thanks to the Triple Silicon Spider (TSS) technology, the 21iD is able to control the moving mass with high linearity, showing an exceptional stability of mechanical parameter values in the long term. Bl force factor, as well as all other electro-dynamic parameters, are linear within the working range. This, together with the exceptional high excursion behavior - 70mm before damage, ±14mm linear Xmax - makes the 21iD an extremely low distortion, highly dynamic transducer. The 21iD features a state-of-the-art 5,3\" inside outside copper ISV (Interleaved Sandwich Voice-Coil) enabling the 21iD to deliver extraordinary transient results. The 21iD has been developed after intense FEA and fluidodynamics simulation and testing,focusing on dissipating the heat generated by the powerful voice coil. Special attention was given to the optimization of air flow into the gap without introducing audible noise. A low-density material air diffractor placed into the heatsink acts as a cooling system, increasing the power handling capability and lowering the power compression figure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"ts_summary\"\u003e\n\u003cdiv class=\"ui tiny statistic\" itemprop=\"additionalProperty\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/PropertyValue\"\u003e\n\u003cdiv class=\"label\" itemprop=\"name\"\u003eF\u003csub\u003eS\u003c\/sub\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cspan itemprop=\"value\"\u003e38\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan itemprop=\"unitText\"\u003eHz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui tiny statistic\" itemprop=\"additionalProperty\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/PropertyValue\"\u003e\n\u003cdiv class=\"label\" itemprop=\"name\"\u003eQ\u003csub\u003eTS\u003c\/sub\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\" itemprop=\"value\"\u003e0.23\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui tiny statistic\" itemprop=\"additionalProperty\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/PropertyValue\"\u003e\n\u003cdiv class=\"label\" itemprop=\"name\"\u003eV\u003csub\u003eAS\u003c\/sub\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cspan itemprop=\"value\"\u003e143\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan itemprop=\"unitText\"\u003eL\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui tiny statistic\" itemprop=\"additionalProperty\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/PropertyValue\"\u003e\n\u003cdiv class=\"label\" itemprop=\"name\"\u003eS\u003csub\u003eD\u003c\/sub\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cspan itemprop=\"value\"\u003e1660\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan itemprop=\"unitText\"\u003ecm²\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui tiny statistic\" itemprop=\"additionalProperty\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/PropertyValue\"\u003e\n\u003cdiv class=\"label\" itemprop=\"name\"\u003eX\u003csub\u003eMAX\u003c\/sub\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cspan itemprop=\"value\"\u003e± 14\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan itemprop=\"unitText\"\u003emm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ts_param\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eResonant frequency\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003ef\u003csub\u003eS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e38\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Q\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eQ\u003csub\u003eES\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e0.24\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical Q\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eQ\u003csub\u003eMS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e5.60\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Q factor\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eQ\u003csub\u003eTS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e0.23\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuspension equivalent air volume\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eV\u003csub\u003eAS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e143\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003elitres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC resistance\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eR\u003csub\u003eE\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e1.3\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum impedance\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eZ\u003csub\u003emin\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e2.0\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil inductance\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eL\u003csub\u003eE\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e1.08\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForce factor\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eB·l\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e25.2\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eT·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eSuspension mechanical resistance\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eR\u003csub\u003eMS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e20.8\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eN·s\/m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eSuspension mechanical compliance\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eC\u003csub\u003eMS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e37\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eµm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eMoving mass\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eM\u003csub\u003eMD\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e441.5\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMoving mass (including airload)\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eM\u003csub\u003eMS\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e489\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003eg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface of the diaphragm\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eS\u003csub\u003eD\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e1660\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003ecm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eEffective diaphragm diameter\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eØ\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e46\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003ecm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum linear excursion\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eX\u003csub\u003emax\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e± 14\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcursion limit\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eX\u003csub\u003elim\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e± 35\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eDisplacement volume at Xmax\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eV\u003csub\u003eD\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e2324\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003ecm³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eη₀\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e3.19\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003e%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"calculated\"\u003e\n\u003ctd\u003eEfficiency bandwidth product\u003c\/td\u003e\n\u003ctd class=\"ts_abb\"\u003eEBP\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e158\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall diameter\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e545\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaffle hole diameter\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e490\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall depth\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e250\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange thickness\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e18\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr itemprop=\"weight\" itemscope=\"\" itemtype=\"http:\/\/schema.org\/QuantitativeValue\"\u003e\n\u003ctd itemprop=\"name\"\u003eNet weight\u003c\/td\u003e\n\u003ctd class=\"td_value\" itemprop=\"value\"\u003e13.6\u003c\/td\u003e\n\u003ctd class=\"td_unit\" itemprop=\"unitText\"\u003ekg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr itemprop=\"material\"\u003e\n\u003ctd\u003eDiaphragm material\u003c\/td\u003e\n\u003ctd colspan=\"2\" class=\"td_text\"\u003eStraight ribbed carbon fiber loaded cellulose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr itemprop=\"material\"\u003e\n\u003ctd\u003eSurround material\u003c\/td\u003e\n\u003ctd colspan=\"2\" class=\"td_text\"\u003eTriple Roll, Polycotton\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice coil diameter\u003c\/td\u003e\n\u003ctd class=\"td_value\"\u003e135\u003c\/td\u003e\n\u003ctd class=\"td_unit\"\u003emm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr itemprop=\"material\"\u003e\n\u003ctd\u003eCoil material\u003c\/td\u003e\n\u003ctd colspan=\"2\" class=\"td_text\"\u003eCopper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr itemprop=\"material\"\u003e\n\u003ctd\u003eMagnet\u003c\/td\u003e\n\u003ctd colspan=\"2\" class=\"td_text\"\u003eNeodymium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"18Sound","offers":[{"title":"Default Title","offer_id":49478518243555,"sku":"022212N000","price":291340.0,"currency_code":"GYD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0538\/0835\/files\/23_36_14_420_Rg8KsTe9__51460.1778008864.png?v=1785472674","url":"https:\/\/592mart.com\/products\/18sound-speaker-21-21id-2ohms-aally-47774","provider":"592MART","version":"1.0","type":"link"}