{"product_id":"avt-8-inch-ported-road-glide-speaker-enclosure","title":"AVT 8-Inch Ported Fairing Speaker Enclosure for Road Glide — Pair","description":"\u003cp\u003e\u003cstrong\u003eBuild around the speaker, not just its watt rating.\u003c\/strong\u003e The AVT 8-inch ported fairing enclosure combines a contoured body with an integrated scroll port for a planned Road Glide audio build.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e$575 per empty left\/right pair, including shipping.\u003c\/strong\u003e Made to order. Ships in 2–3 days. ABS in matte black \/ charcoal. Speakers are sold separately.\u003c\/p\u003e\n\u003ch2 id=\"engineering-development\"\u003eThirteen drivers. Different response.\u003c\/h2\u003e\n\u003cp\u003eAn 8-inch driver's response depends on the enclosure it works in. Our development study compared 13 drivers in the same historical scroll-port geometry, showing the tradeoffs between extension, response shape and available output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModeled examples:\u003c\/strong\u003e the PRV 8MB700-4 reached its relative −3 dB point at about \u003cstrong\u003e123 Hz\u003c\/strong\u003e; the Beyma PRO8CF reached about \u003cstrong\u003e109 Hz\u003c\/strong\u003e, with a larger response rise. This shows why driver matching matters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHistorical small-signal model: response shape, not loudness.\u003c\/strong\u003e Each curve is normalized to its own median 200–400 Hz level. There is no common high-pass filter in this graph. These are development comparisons, not measured production response or fitment approvals.\u003c\/p\u003e\n\u003cfigure style=\"margin:20px 0\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-driver-response.png?v=1790033848\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-driver-response.png?v=1790033848\" alt=\"Thirteen-driver historical 8-inch model comparing normalized response shape, not loudness.\" loading=\"lazy\" style=\"display:block;width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eThirteen-driver normalized response comparison. Compare low-frequency extension and response rise, rather than treating nominal size or advertised wattage as the whole story.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-driver-response.png?v=1790033848\" target=\"_blank\" rel=\"noopener\"\u003eOpen this chart full size\u003c\/a\u003e\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary style=\"cursor:pointer;text-decoration:underline\"\u003eShow \/ hide: Response-model conditions\u003c\/summary\u003e\u003cp\u003eThe geometry predates final production reconciliation. The historical geometry used 5.69 L gross airspace, 0.88 L port volume and each driver's modeled intrusion. The PRV example used 0.50 L intrusion, leaving 4.31 L net with a modeled 121.9 Hz alignment. These values describe the study, not measured current-production tuning. The scroll-port analysis considered changing cross-section along the port rather than treating it as a uniform straight tube.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eRated power is only part of the story\u003c\/h2\u003e\n\u003cp\u003eUsable low-frequency output also depends on cone travel. The next study compares output at each driver's own rated RMS power, using the lower of the thermal-response and simplified displacement ceilings. \u003cstrong\u003eIt is not an equal-wattage or equal-voltage comparison.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe orange DS18 PRO-1KP8.4 curve is thermal-only and optimistic:\u003c\/strong\u003e its Xmax value is missing from the dataset, so no cone-travel ceiling was applied. Its apparent lead must not be read as a verified output winner.\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary style=\"cursor:pointer;text-decoration:underline\"\u003eShow \/ hide: View the modeled rated-power output comparison\u003c\/summary\u003e\n\u003cfigure style=\"margin:20px 0\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-rated-power-output.png?v=1790033853\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-rated-power-output.png?v=1790033853\" alt=\"Historical modeled 8-inch output at each driver's own rated power. Orange DS18 curve lacks an excursion limit.\" loading=\"lazy\" style=\"display:block;width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eHistorical modeled output, not measured maximum SPL. Most useful above tuning; below-tuning port\/cone interaction is not resolved. Compression and the installed motorcycle's acoustic transfer are excluded.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-modeled-rated-power-output.png?v=1790033853\" target=\"_blank\" rel=\"noopener\"\u003eOpen this chart full size\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eMeasured on the motorcycle\u003c\/h2\u003e\n\u003cp\u003eThe 8-inch prototype was tested on August 26, 2026, with separate left\/right cone and port captures and a combined rider-position sweep. This adds real installed-development evidence alongside the modeling.\u003c\/p\u003e\n\u003cfigure style=\"margin:20px 0\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-prototype-both-speakers-measurement.png?v=1790033861\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-prototype-both-speakers-measurement.png?v=1790033861\" alt=\"August 26, 2026 prototype measurement: both 8-inch speakers at the rider position, with cone and port traces for context.\" loading=\"lazy\" style=\"display:block;width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eMeasured prototype evidence — both 8-inch speakers at the rider position. The rider trace is 8_Both_Rider_HPF90_Raw; cone and port traces remain for context. The instructed filter was 90 Hz \/ 12 dB per octave. Acquisition level and exact driver variant\/impedance are unconfirmed. This is not one enclosure's output or a maximum-output test.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-8-prototype-both-speakers-measurement.png?v=1790033861\" target=\"_blank\" rel=\"noopener\"\u003eOpen this chart full size\u003c\/a\u003e\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary style=\"cursor:pointer;text-decoration:underline\"\u003eShow \/ hide: About the prototype measurement\u003c\/summary\u003e\u003cp\u003eThe nearfield curves and rider trace represent different measurement positions and cannot be compared as equivalent output levels. The capture documents prototype behavior; it does not establish the historical model's tuning or a guaranteed production SPL.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eVehicle and speaker fitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFor motorcycles using the same factory speaker enclosure as the 2017 Harley-Davidson Road Glide.\u003c\/strong\u003e Confirm the configuration with AVT if your motorcycle has a replacement fairing or previous custom audio installation.\u003c\/p\u003e\n\u003cp\u003eConfirm the exact speaker clearance before ordering. Nominal 8-inch size alone does not establish compatibility: frame shape, mounting depth, magnet dimensions, terminals and mounting holes all matter. Provide AVT with your motorcycle year, model, fairing configuration and exact speaker model. The comparison charts are acoustic development studies, not a fitment list.\u003c\/p\u003e\n\u003ch2\u003eInstallation and system setup\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eA small modification to the inner fairing vent outlet is required for the 8-inch enclosures.\u003c\/strong\u003e The gallery shows this installation detail. Confirm the modification with AVT before installation.\u003c\/p\u003e\n\u003cp\u003eReuse the stock enclosure mounting hardware. Check speaker seating, sealing, wiring, terminal and port clearance before reassembling the fairing. Configure suitable high-pass protection and amplifier gain for the installed speaker, following its manufacturer's operating guidance. Speaker power and impedance ratings are not ratings of the empty enclosure.\u003c\/p\u003e\n\u003ch2\u003eWhat's included\u003c\/h2\u003e\n\u003cp\u003eOne empty left\/right enclosure pair. Speakers, mounting hardware, grilles, wiring and accessories are not included. Retain the original enclosure mounting hardware for reuse.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/avt-enclosures\"\u003eCompare the AVT enclosure sizes\u003c\/a\u003e, or contact AVT to plan your speaker pairing.\u003c\/p\u003e\n","brand":"American V Twin","offers":[{"title":"Default Title","offer_id":48404524499081,"sku":"AVT-RG-ENCL-8","price":575.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/8930\/5993\/files\/avt-rg-encl-8-image-1.png?v=1790029282","url":"https:\/\/americanvtwinparts.com\/products\/avt-8-inch-ported-road-glide-speaker-enclosure","provider":"American V Twin","version":"1.0","type":"link"}