{"product_id":"polk-audio-mm522-5-25in-coaxial-speaker-marine-car","title":"Polk Audio MM522 5.25in Coaxial Speaker - Marine \u0026 Car","description":"\u003cp\u003eIn this review of the Polk Audio MM522 5.25in coaxial speaker, the bottom line is simple: this model is aimed at drivers and boat owners who want clear, resilient sound from a compact speaker that can take marine conditions. The MM522 stands out for its \u003cstrong\u003eIP56 Ultra-Marine certification\u003c\/strong\u003e and Polk's Dynamic Balance tuning, which together promise corrosion resistance and low distortion. For anyone upgrading factory car speakers or fitting audio on a boat where exposure to salt and sun is a concern, the MM522 delivers a focused set of strengths worth considering.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-marine protection:\u003c\/strong\u003e IP56 certification means the speaker is tested against salt fog, UV and humidity for longer life in harsh environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitanium-plated woofer:\u003c\/strong\u003e The 5.25in composite cone with a titanium finish aims to keep low frequencies tight and punchy in a small enclosure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerylene tweeter:\u003c\/strong\u003e A 1in Terylene fabric dome handles highs with a crossover directing highs and lows to the correct drivers for clearer separation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic Balance tuning:\u003c\/strong\u003e Polk's laser-imaged material matching reduces distortion and widens dispersion for a more natural midrange and vocal clarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable build for marine use:\u003c\/strong\u003e Santoprene surrounds, stainless steel hardware and an ABS basket help resist corrosion and maintain performance outdoors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug-and-play installation:\u003c\/strong\u003e Includes mounting hardware and grilles that make installation straightforward and improve finished appearance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe MM522 is ideal for vehicle owners and boaters who need a compact, corrosion-resistant speaker that improves clarity over many factory units; it suits small upgrades where space and durability matter. It also fits custom installs where a 5.25in coaxial with a decent power handling is required.\u003c\/p\u003e\n\u003cp\u003eThose seeking very deep bass or audiophile-level fidelity from a small coaxial should look elsewhere, since a 5.25in driver has inherent low-frequency limits. Also, buyers concerned about long-term reliability should weigh mixed user reports about build and longevity alongside the speaker's environmental protections.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClear highs and controlled mids thanks to the Terylene tweeter and epoxy-coated crossover.\u003c\/li\u003e\n\u003cli\u003eResistant to marine elements with IP56 certification and corrosion-resistant hardware.\u003c\/li\u003e\n\u003cli\u003eDynamic Balance design reduces distortion and improves overall sound dispersion.\u003c\/li\u003e\n\u003cli\u003eGood power handling for size (240W peak, 80W RMS) making it louder than many stock speakers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome customers report premature failures, so longevity can be inconsistent in practice.\u003c\/li\u003e\n\u003cli\u003eLimited bass extension compared with larger component speakers or dedicated woofers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e5.25in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003e2-way coaxial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e240W peak, 80W RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpedance\u003c\/td\u003e\n\u003ctd\u003e4 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response\u003c\/td\u003e\n\u003ctd\u003e50Hz - 40kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWoofer\u003c\/td\u003e\n\u003ctd\u003eTitanium-plated composite cone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTweeter\u003c\/td\u003e\n\u003ctd\u003e1in Terylene fabric dome\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Polk MM522 is a practical choice for car and marine installs where corrosion resistance and clarity matter more than deep bass. It offers solid power handling, Polk's distortion-reducing Dynamic Balance, and rugged materials that make it good value for owners who need reliable, loud, and clear sound in challenging environments.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these speakers safe for saltwater boats?\u003c\/strong\u003e\u003cbr\u003eYes, the MM522 carries IP56 Ultra-Marine certification and uses corrosion-resistant hardware and materials designed for marine exposure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill these give deep bass in a small boat or car?\u003c\/strong\u003e\u003cbr\u003eThey deliver punchy mid-bass for a 5.25in speaker but will not replace a dedicated subwoofer for very low bass.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs installation hardware included?\u003c\/strong\u003e\u003cbr\u003eYes, Polk supplies mounting hardware and grilles to simplify installation and finish the look.\u003c\/p\u003e","brand":"Polk Audio","offers":[{"title":"Default Title","offer_id":46759624507611,"sku":"B072Q9BCGH","price":179.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51rrUhEq1AL._AC_SL1080.jpg?v=1747804584","url":"https:\/\/gearmusthave.com\/products\/polk-audio-mm522-5-25in-coaxial-speaker-marine-car","provider":"GearMustHave","version":"1.0","type":"link"}