{"product_id":"rockford-fosgate-tm400x4ad-harley-amplifier","title":"Rockford Fosgate TM400X4ad 400W 4-Channel Motorcycle Amplifier for Harley Audio Systems","description":"\u003ch1 data-section-id=\"1jlcymu\" data-start=\"328\" data-end=\"426\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"331\" data-end=\"426\"\u003eRockford Fosgate TM400X4ad 400W 4-Channel Motorcycle Amplifier for Harley Audio Systems\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp data-start=\"428\" data-end=\"566\"\u003eIf you’ve already upgraded your Harley speakers but still can’t hear your music clearly at highway speeds—the problem isn’t your speakers.\u003c\/p\u003e\n\u003cp data-start=\"568\" data-end=\"586\"\u003e\u003cstrong data-start=\"571\" data-end=\"586\"\u003eIt’s power.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"588\" data-end=\"791\"\u003eThe \u003cstrong data-start=\"592\" data-end=\"622\"\u003eRockford Fosgate TM400X4ad\u003c\/strong\u003e is one of the most proven motorcycle amplifiers for Harley-Davidson audio systems because it delivers clean, consistent power where it matters most—while you’re riding.\u003c\/p\u003e\n\u003cp data-start=\"793\" data-end=\"973\"\u003eDesigned specifically for motorcycles and open-air environments, this amplifier transforms your system from “better than stock” into something you can actually enjoy at 60–70+ mph.\u003c\/p\u003e\n\u003ch3 data-section-id=\"144o6dp\" data-start=\"980\" data-end=\"1023\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"984\" data-end=\"1023\"\u003eWhy Riders Upgrade to the TM400X4ad\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1025\" data-end=\"1055\"\u003eMost riders hit the same wall:\u003c\/p\u003e\n\u003cul data-start=\"1057\" data-end=\"1186\"\u003e\n\u003cli data-section-id=\"nj6te4\" data-start=\"1057\" data-end=\"1105\"\u003eupgraded speakers, but still not loud enough\u003c\/li\u003e\n\u003cli data-section-id=\"1gi9bjy\" data-start=\"1106\" data-end=\"1147\"\u003edistortion when turning up the volume\u003c\/li\u003e\n\u003cli data-section-id=\"j7nzjn\" data-start=\"1148\" data-end=\"1186\"\u003emusic disappears at highway speeds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1188\" data-end=\"1277\"\u003eThat’s because factory systems—and even upgraded speakers—don’t have enough usable power.\u003c\/p\u003e\n\u003cp data-start=\"1279\" data-end=\"1318\"\u003eThe TM400X4ad fixes that by delivering:\u003c\/p\u003e\n\u003cul data-start=\"1320\" data-end=\"1477\"\u003e\n\u003cli data-section-id=\"19hgohq\" data-start=\"1320\" data-end=\"1376\"\u003econsistent output at both 2Ω and 4Ω (Constant Power)\u003c\/li\u003e\n\u003cli data-section-id=\"1w1hh5l\" data-start=\"1377\" data-end=\"1417\"\u003eclean signal with minimal distortion\u003c\/li\u003e\n\u003cli data-section-id=\"6wfzxr\" data-start=\"1418\" data-end=\"1477\"\u003ereal-world volume that cuts through wind and road noise\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1479\" data-end=\"1552\"\u003eThis is the upgrade that makes everything else work the way it should.\u003c\/p\u003e\n\u003ch2 data-section-id=\"69tm04\" data-start=\"1559\" data-end=\"1623\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1562\" data-end=\"1623\"\u003eIs the TM400X4ad the Right Amplifier for Your Harley?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1625\" data-end=\"1660\"\u003eThis amplifier is a perfect fit if:\u003c\/p\u003e\n\u003cul data-start=\"1662\" data-end=\"1860\"\u003e\n\u003cli data-section-id=\"dddxf6\" data-start=\"1662\" data-end=\"1715\"\u003eyou can’t hear your music clearly above 50–60 mph\u003c\/li\u003e\n\u003cli data-section-id=\"119u1sg\" data-start=\"1716\" data-end=\"1759\"\u003eyour upgraded speakers still sound weak\u003c\/li\u003e\n\u003cli data-section-id=\"1kbgzeg\" data-start=\"1760\" data-end=\"1813\"\u003eyou want louder, cleaner sound without distortion\u003c\/li\u003e\n\u003cli data-section-id=\"1swyzdl\" data-start=\"1814\" data-end=\"1860\"\u003eyou’re building a full Harley audio system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1862\" data-end=\"1936\"\u003eIf any of those sound familiar—this is likely the next step in your build.\u003c\/p\u003e\n\u003ch2 data-section-id=\"y9igwy\" data-start=\"1943\" data-end=\"2012\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1946\" data-end=\"2012\"\u003eWhat This Amplifier Actually Does (Real-World Performance)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2014\" data-end=\"2079\"\u003eThis isn’t just about “more watts”—it’s about usable performance.\u003c\/p\u003e\n\u003cp data-start=\"2081\" data-end=\"2135\"\u003eWith the TM400X4ad installed correctly, you’ll notice:\u003c\/p\u003e\n\u003cul data-start=\"2137\" data-end=\"2309\"\u003e\n\u003cli data-section-id=\"1rtsf75\" data-start=\"2137\" data-end=\"2172\"\u003estronger vocal clarity at speed\u003c\/li\u003e\n\u003cli data-section-id=\"zxjle\" data-start=\"2173\" data-end=\"2216\"\u003ehigher usable volume without distortion\u003c\/li\u003e\n\u003cli data-section-id=\"7p29iz\" data-start=\"2217\" data-end=\"2273\"\u003ebetter midrange projection (cuts through wind noise)\u003c\/li\u003e\n\u003cli data-section-id=\"1cfjjfe\" data-start=\"2274\" data-end=\"2309\"\u003eimproved overall system balance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2311\" data-end=\"2391\"\u003eThis is what allows your system to perform while riding—not just when parked.\u003c\/p\u003e\n\u003ch2 data-section-id=\"18mvuz8\" data-start=\"2398\" data-end=\"2455\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2401\" data-end=\"2455\"\u003eRecommended Speaker Pairings for the TM400X4ad\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2457\" data-end=\"2535\"\u003eThis amplifier is most commonly used to power high-efficiency Harley speakers.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1wjyue2\" data-start=\"2537\" data-end=\"2595\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2541\" data-end=\"2593\"\u003eFront Fairing Speaker Upgrade (2014–2023 Models)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2596\" data-end=\"2672\"\u003ePair with:\u003cbr data-start=\"2606\" data-end=\"2609\"\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms65-harley-6-5-fairing-speakers\" data-start=\"2612\" data-end=\"2670\" rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003ehttps:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms65-harley-6-5-fairing-speakers\u003cbr\u003e\u003cbr\u003e\u003c\/a\u003e\u003cspan role=\"text\"\u003eRear Saddlebag Speaker Upgrade (6x9 Performance)\u003cbr\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms69-harley-saddlebag-6x9-speakers\"\u003ehttps:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms69-harley-saddlebag-6x9-speakers\u003c\/a\u003e\u003cstrong data-start=\"2683\" data-end=\"2735\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2842\" data-end=\"2877\"\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAdd depth and midbass with:\u003c\/span\u003e1998–2013 Harley Touring Models\u003cbr\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms5-harley-tour-pak-speakers\"\u003ehttps:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms5-harley-tour-pak-speakers\u003c\/a\u003e\u003cstrong data-start=\"2842\" data-end=\"2877\"\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDirect upgrade pairing:\u003c\/span\u003eWhen paired correctly, this amplifier unlocks the full potential of your entire system.\u003cbr\u003e\u003cbr\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3075\" data-end=\"3113\"\u003eComplete System Upgrade Option\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003eIf you want everything matched and engineered to work together from the start:\u003cbr\u003e\u003ca data-start=\"3198\" data-end=\"3271\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/stereoinstalls.com\/collections\/rockford-fosgate-harley-audio-kits\"\u003ehttps:\/\/stereoinstalls.com\/collections\/rockford-fosgate-harley-audio-kits\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse href=\"\/cdn\/assets\/sprites-core-lbtco6v1.svg#304883\" fill=\"currentColor\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003eA complete system ensures:\u003c\/p\u003e\n\u003cp data-start=\"2880\" data-end=\"2968\"\u003e\u003ca data-start=\"2909\" data-end=\"2966\" rel=\"noopener\" class=\"decorated-link cursor-pointer\" href=\"https:\/\/stereoinstalls.com\/products\/rockford-fosgate-tms5-harley-tour-pak-speakers\"\u003e\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse href=\"\/cdn\/assets\/sprites-core-lbtco6v1.svg#304883\" fill=\"currentColor\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cul data-start=\"3303\" data-end=\"3379\"\u003e\n\u003cli data-section-id=\"1l6dd1q\" data-start=\"3303\" data-end=\"3328\"\u003eproper power matching\u003c\/li\u003e\n\u003cli data-section-id=\"n30bdp\" data-start=\"3329\" data-end=\"3352\"\u003eeasier installation\u003c\/li\u003e\n\u003cli data-section-id=\"1g8ci1c\" data-start=\"3353\" data-end=\"3379\"\u003econsistent performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"extpgr\" data-start=\"3386\" data-end=\"3423\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3389\" data-end=\"3423\"\u003eKey Features \u0026amp; Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3425\" data-end=\"3775\"\u003e\n\u003cli data-section-id=\"1g7wnnv\" data-start=\"3425\" data-end=\"3464\"\u003e400W 4-channel motorcycle amplifier\u003c\/li\u003e\n\u003cli data-section-id=\"80jb3t\" data-start=\"3465\" data-end=\"3511\"\u003e100W x 4 @ 4Ω \/ 2Ω (Constant Power design)\u003c\/li\u003e\n\u003cli data-section-id=\"vlol18\" data-start=\"3512\" data-end=\"3532\"\u003e200W x 2 bridged\u003c\/li\u003e\n\u003cli data-section-id=\"cf7drv\" data-start=\"3533\" data-end=\"3571\"\u003eClass-AD high-efficiency amplifier\u003c\/li\u003e\n\u003cli data-section-id=\"1adrr7c\" data-start=\"3572\" data-end=\"3608\"\u003eBuilt-in crossovers and Punch EQ\u003c\/li\u003e\n\u003cli data-section-id=\"c8iodb\" data-start=\"3609\" data-end=\"3645\"\u003eC.L.E.A.N. clip detection system\u003c\/li\u003e\n\u003cli data-section-id=\"3subqc\" data-start=\"3646\" data-end=\"3685\"\u003eHigh-level inputs with auto turn-on\u003c\/li\u003e\n\u003cli data-section-id=\"1jbiuao\" data-start=\"3686\" data-end=\"3730\"\u003eCompact chassis for Harley installations\u003c\/li\u003e\n\u003cli data-section-id=\"1sgzw2y\" data-start=\"3731\" data-end=\"3775\"\u003eWeather-resistant (Element Ready design)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"117ex85\" data-start=\"3782\" data-end=\"3821\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3785\" data-end=\"3821\"\u003eInstallation \u0026amp; Fitment Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3823\" data-end=\"4070\"\u003e\n\u003cli data-section-id=\"6mr5ex\" data-start=\"3823\" data-end=\"3900\"\u003eCompact size allows mounting in fairings, saddlebags, or custom locations\u003c\/li\u003e\n\u003cli data-section-id=\"1pho1pv\" data-start=\"3901\" data-end=\"3964\"\u003eWorks with factory Harley radios and aftermarket head units\u003c\/li\u003e\n\u003cli data-section-id=\"fogzp1\" data-start=\"3965\" data-end=\"4007\"\u003eIdeal for front + rear speaker systems\u003c\/li\u003e\n\u003cli data-section-id=\"125ksg9\" data-start=\"4008\" data-end=\"4070\"\u003eProfessional installation recommended for best performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4072\" data-end=\"4165\"\u003eWant help building your system correctly:\u003cbr data-start=\"4116\" data-end=\"4119\"\u003e\u003ca data-start=\"4119\" data-end=\"4163\" rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/stereoinstalls.com\/pages\/get-a-quote\"\u003ehttps:\/\/stereoinstalls.com\/pages\/get-a-quote\u003cspan aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cuse href=\"\/cdn\/assets\/sprites-core-lbtco6v1.svg#304883\" fill=\"currentColor\"\u003e\u003c\/use\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"109mbr0\" data-start=\"4172\" data-end=\"4232\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4175\" data-end=\"4232\"\u003eLearn How to Build a Complete Harley Audio System\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"4234\" data-end=\"4320\"\u003eIf you’re still planning your upgrade, this guide breaks everything down step-by-step:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/blogs\/blog-pages\/rockford-fosgate-harley-audio-upgrade-mentor-ohio\"\u003ehttps:\/\/stereoinstalls.com\/blogs\/blog-pages\/rockford-fosgate-harley-audio-upgrade-mentor-ohio\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"tay0cx\" data-start=\"4417\" data-end=\"4473\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4420\" data-end=\"4473\"\u003eMotorcycle Audio Installation in Mentor, Ohio\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"4475\" data-end=\"4568\"\u003eStereo Installs specializes in Harley-Davidson audio upgrades designed for real-world riding.\u003c\/p\u003e\n\u003cp data-start=\"4570\" data-end=\"4639\"\u003e📍 \u003cstrong data-start=\"4573\" data-end=\"4592\"\u003eStereo Installs\u003c\/strong\u003e\u003cbr data-start=\"4592\" data-end=\"4595\"\u003e7471 Tyler Blvd Ste B\u003cbr data-start=\"4616\" data-end=\"4619\"\u003eMentor, Ohio 44060\u003c\/p\u003e\n\u003cp data-start=\"4641\" data-end=\"4649\"\u003eServing:\u003c\/p\u003e\n\u003cul data-start=\"4651\" data-end=\"4738\"\u003e\n\u003cli data-section-id=\"1ffj792\" data-start=\"4651\" data-end=\"4664\"\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/pages\/car-audio-installation-cleveland-ohio\" title=\"Cleveland\"\u003eCleveland\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"fh269z\" data-start=\"4665\" data-end=\"4675\"\u003eMentor\u003c\/li\u003e\n\u003cli data-section-id=\"m10660\" data-start=\"4676\" data-end=\"4690\"\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/pages\/car-audio-installation-willoughby-ohio\" title=\"Willoughby\"\u003eWilloughby\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"1sgjcx4\" data-start=\"4691\" data-end=\"4703\"\u003eEastlake\u003c\/li\u003e\n\u003cli data-section-id=\"rd5c2a\" data-start=\"4704\" data-end=\"4719\"\u003ePainesville\u003c\/li\u003e\n\u003cli data-section-id=\"1d5e2th\" data-start=\"4720\" data-end=\"4738\"\u003eNortheast Ohio\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4740\" data-end=\"4751\"\u003eWe install:\u003c\/p\u003e\n\u003cul data-start=\"4753\" data-end=\"4844\"\u003e\n\u003cli data-section-id=\"13n0g59\" data-start=\"4753\" data-end=\"4784\"\u003eRockford Fosgate amplifiers\u003c\/li\u003e\n\u003cli data-section-id=\"eoy3la\" data-start=\"4785\" data-end=\"4811\"\u003eHarley speaker systems\u003c\/li\u003e\n\u003cli data-section-id=\"10tms37\" data-start=\"4812\" data-end=\"4844\"\u003efull motorcycle audio builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"wk8n1b\" data-start=\"4851\" data-end=\"4888\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4854\" data-end=\"4888\"\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-section-id=\"4hizyx\" data-start=\"4890\" data-end=\"4950\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4894\" data-end=\"4948\"\u003eWill this make my Harley louder at highway speeds?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"4951\" data-end=\"5034\"\u003eYes. This amplifier significantly increases usable volume and clarity while riding.\u003c\/p\u003e\n\u003ch3 data-section-id=\"76o6q3\" data-start=\"5041\" data-end=\"5097\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5045\" data-end=\"5095\"\u003eDo I need this if I already upgraded speakers?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5098\" data-end=\"5169\"\u003eYes. Without an amplifier, speakers won’t reach their full performance.\u003c\/p\u003e\n\u003ch3 data-section-id=\"919ctm\" data-start=\"5176\" data-end=\"5225\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5180\" data-end=\"5223\"\u003eCan this power front and rear speakers?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5226\" data-end=\"5291\"\u003eYes. This 4-channel amplifier is designed for full system setups.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cm5480\" data-start=\"5298\" data-end=\"5344\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5302\" data-end=\"5342\"\u003eIs this amplifier weather-resistant?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5345\" data-end=\"5400\"\u003eYes. It’s built for motorcycle and marine environments.\u003c\/p\u003e\n\u003ch3 data-section-id=\"y9owkt\" data-start=\"5407\" data-end=\"5469\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5411\" data-end=\"5467\"\u003eIs this a good amp for a Harley bagger audio system?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"5470\" data-end=\"5544\"\u003eYes. It’s one of the most popular choices for Harley touring audio builds.\u003c\/p\u003e\n\u003ch2 data-section-id=\"flez67\" data-start=\"5551\" data-end=\"5601\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5554\" data-end=\"5601\"\u003eUpgrade Your Harley Audio the Right Way\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"5603\" data-end=\"5674\"\u003eThere’s a big difference between upgrading parts and building a system.\u003c\/p\u003e\n\u003cp data-start=\"5676\" data-end=\"5839\"\u003eThe \u003cstrong data-start=\"5680\" data-end=\"5710\"\u003eRockford Fosgate TM400X4ad\u003c\/strong\u003e is the amplifier that brings your entire system together—delivering real performance where it matters most: while you’re riding.\u003c\/p\u003e\n\u003cp data-start=\"5841\" data-end=\"5915\"\u003eIf your system still isn’t loud enough, this is the upgrade that fixes it.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/stereoinstalls.com\/collections\/rockford-fosgate-motorcycle-audio-harley-davidson-stereo-upgrades-bagger-sound-systems\"\u003ehttps:\/\/stereoinstalls.com\/collections\/rockford-fosgate-motorcycle-audio-harley-davidson-stereo-upgrades-bagger-sound-systems\u003c\/a\u003e\u003c\/p\u003e","brand":"Rockford Fosgate","offers":[{"title":"Default Title","offer_id":50437017600314,"sku":"TM400X4ad","price":449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3531\/1674\/files\/rockford-fosgate-tm400x4ad-400-watt-4-channel-amplifier.png?v=1735324189","url":"https:\/\/stereoinstalls.com\/products\/rockford-fosgate-tm400x4ad-harley-amplifier","provider":"Stereo Installs","version":"1.0","type":"link"}