{"id":4905,"date":"2024-07-26T13:05:32","date_gmt":"2024-07-26T19:05:32","guid":{"rendered":"https:\/\/adcaraudio.com\/store\/?post_type=product&#038;p=4905"},"modified":"2026-03-10T12:06:41","modified_gmt":"2026-03-10T18:06:41","slug":"2308-d4","status":"publish","type":"product","link":"https:\/\/adcaraudio.com\/store\/product\/2308-d4\/","title":{"rendered":"2308 D4"},"content":{"rendered":"<p>The 2300 series 8&#8243; employs a finely-tuned balance of damping and motor force to achieve high efficiency, offering exceptional versatility and performance in a variety of real-world functions:<\/p>\n<p>Paired with a traditional (4th order) bass-reflex enclosure, the subwoofer\u2019s output can be focused along a narrow bandwidth for use in sheer loudness \/ SPL applications. In a 6th order bass-reflex, the output can be spread along a wider frequency range, shifting emphasis onto sound quality with articulate delivery and highly controlled excursion.<\/p>\n<pre><strong>Fs<\/strong>\t 50.44 Hz\r\n<strong>Qms<\/strong>\t 7.534\r\n<strong>Vas<\/strong>\t 4.226 l\r\n<strong>Cms<\/strong>\t 0.079 mm\/N\r\n<strong>Mms<\/strong>\t 125.3 g\r\n<strong>Rms<\/strong>\t 5.301 kg\/s\r\n<strong>Dia<\/strong>\t 157.2 mm\r\n<strong>Sd<\/strong>\t 194.1 cm\u00b2\r\n\t\r\n<strong>Qes<\/strong>\t 0.5702\r\n<strong>Re<\/strong>\t 6.771 \u03a9\r\n<strong>Le<\/strong>\t 4.602 mH\r\n<strong>Z<\/strong>\t 8.1252 \u03a9\r\n<strong>Bl<\/strong>\t 21.72 Tm\r\n\r\n<strong>Qts<\/strong>\t 0.5301\r\n<strong>no<\/strong>\t 0.0917 %\r\n<strong>SPL<\/strong>\t 81.77 dB\r\n<strong>EBP<\/strong>\t 88.46\r\n\r\n<strong>Xmax<\/strong> +\/- 10.5mm\r\n<strong>Nominal Diameter<\/strong>\t\t8 in\r\n<strong>Overall Diameter<\/strong>\t\t8.39 in \/ 213 mm\r\n<strong>Mounting Hole Diameter<\/strong>\t\t7.13 in \/ 181 mm\r\n<strong>Bolt Hole Circle Diameter<\/strong>\r\n<strong>Motor Outer Diameter            <\/strong>5.70 in \/ 145 mm\r\n<strong>Mounting Depth<\/strong>\t\t\t4.92 in \/ 125 mm\r\n<strong>Required Pole Vent Clearance<\/strong>\r\n<strong>Driver Displacement<\/strong>\t\t0.048 cu ft \/ 1.37 l\r\n\r\n<strong>Minimum Sealed Volume<\/strong>\t\tN\/A\r\n<strong>Minimum Vented Volume<\/strong>\t\t0.42 cu ft \/ 12 l net*\r\n\r\n* Tune for desired response<\/pre>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-704\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented.png\" alt=\"\" width=\"800\" height=\"898\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented.png 800w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented-600x674.png 600w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented-267x300.png 267w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented-768x862.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-3341\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented_dual-1024x869-1.png\" alt=\"\" width=\"1024\" height=\"869\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented_dual-1024x869-1.png 1024w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented_dual-1024x869-1-600x509.png 600w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented_dual-1024x869-1-300x255.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/recommended_enc_2208_vented_dual-1024x869-1-768x652.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>The above designs have been engineered for a &#8220;two tier&#8221; balance of compatibility: First, between the cabin acoustics of a sedan, hatchback and an SUV, and second, between the two available voice coil configurations, for a total of six balance points. This ensures a linear response and optimal power handling for listening purposes under most circumstances. Please visit our <a href=\"https:\/\/adcaraudio.com\/store\/enclosure-design-service\/\">Enclosure Design Service<\/a> page for custom designs.<\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-14.pdf\"><img decoding=\"async\" class=\"alignnone size-full wp-image-2911\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-suv-4door-single-sub-2.png\" alt=\"\" width=\"300\" height=\"255\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-17.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3680\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-3.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-3.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-3-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-3-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-72.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3081\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-sedan-4door-triple-subs.png\" alt=\"\" width=\"300\" height=\"255\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-33.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3327\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-suv-4-door-quad-subs.png\" alt=\"\" width=\"300\" height=\"255\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-40.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3597\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-1.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-1.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-1-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-1-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-56.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3841\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-15.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-15.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-15-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-15-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-74.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3911\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-29.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-29.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-29-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-29-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-78.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3923\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-34.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-34.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-34-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-34-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-84.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3945\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-39.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-39.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-39-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-39-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Design-119.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4052\" src=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-66.png\" alt=\"\" width=\"300\" height=\"255\" srcset=\"https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-66.png 300w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-66-71x60.png 71w, https:\/\/adcaraudio.com\/store\/wp-content\/uploads\/Web-Enclosure-Design-Button-66-106x90.png 106w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<h3><\/h3>\n<ul>\n<li>8&#8243; Dual 4 ohm subwoofer<\/li>\n<li>150W \u2013 400W optimal power range<\/li>\n<li>2&#8243; voice coil diameter<\/li>\n<li>Designed for use in small vented enclosures.<\/li>\n<li>Engineered in the USA.<\/li>\n<\/ul>\n","protected":false},"featured_media":4485,"template":"","meta":{"jetpack_post_was_ever_published":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"product_brand":[],"product_cat":[37,18],"product_tag":[],"class_list":{"0":"post-4905","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-2000-series-subwoofers","7":"product_cat-subwoofers","9":"first","10":"instock","11":"taxable","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product\/4905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/media\/4485"}],"wp:attachment":[{"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/media?parent=4905"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_brand?post=4905"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_cat?post=4905"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/adcaraudio.com\/store\/wp-json\/wp\/v2\/product_tag?post=4905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}