{"product_id":"cadence-sound-sqa500-4-4-channel-marine-class-d-amplifier","title":"Cadence Sound SQA500.4 4-Channel Marine Class D Amplifier 500W","description":"\u003ch3\u003eMarine-Grade Power for Every Adventure — Cadence Sound SQA500.4 4-Channel Marine Amplifier\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Closeout Item — Final Sale. All sales are final. Item is new unless otherwise noted.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhether you're on the water or on the road, the \u003cstrong\u003eCadence Sound SQA500.4\u003c\/strong\u003e delivers clean, reliable 4-channel power built to survive the elements. With a conformal-coated PCB that resists corrosion in both freshwater and saltwater environments, this Class D marine amplifier is engineered for the conditions that would destroy a standard amp. 500W of total power, a signal-to-noise ratio over 96dB, and THD under 0.05% — this is serious audio performance in a compact, marine-rated package.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e500W 4-Channel Class D Amplifier:\u003c\/strong\u003e Powers four speakers with 125W x 4 at 2 ohms or 80W x 4 at 4 ohms for clean, efficient output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine-Rated Conformal Coating:\u003c\/strong\u003e PCB is coated for exceptional corrosion resistance in freshwater and saltwater environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD \u0026lt; 0.05%:\u003c\/strong\u003e Extremely low distortion for pristine, accurate audio reproduction at any volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio \u0026gt; 96dB:\u003c\/strong\u003e Ultra-quiet background noise floor for clear, detailed sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelectable Low Pass \u0026amp; High Pass Filters (50Hz–150Hz):\u003c\/strong\u003e Dial in your crossover points to match your speaker configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Input Gain Sensitivity:\u003c\/strong\u003e Match the amp's input to any head unit for optimal signal level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2CH\/4CH Zone Controls:\u003c\/strong\u003e Flexible zone switching for multi-zone marine audio setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Audio Volume Control:\u003c\/strong\u003e Adjust output level with precision from the amp or remote.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal\/Overload \u0026amp; Speaker Short Protection:\u003c\/strong\u003e Built-in protection circuits keep the amp and your speakers safe.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED Power \u0026amp; Protection Indicators:\u003c\/strong\u003e At-a-glance status monitoring for quick diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft Turn-On Circuit:\u003c\/strong\u003e Eliminates power-on pop for a clean, professional installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel Screws \u0026amp; Metal Mounting Feet:\u003c\/strong\u003e Durable hardware built for marine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePower Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRMS @ 2 Ohm (14.4V): 125W x 4\u003c\/li\u003e\n\u003cli\u003eRMS @ 4 Ohm (14.4V): 80W x 4\u003c\/li\u003e\n\u003cli\u003eTotal Max Power: 500W\u003c\/li\u003e\n\u003cli\u003eFuse Rating: 30A x 2\u003c\/li\u003e\n\u003cli\u003eTHD: \u0026lt; 0.05%\u003c\/li\u003e\n\u003cli\u003eSNR: \u0026gt; 96dB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e8.25\" W x 1.9\" H x 7.3\" D (210mm x 48mm x 185mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy the Cadence SQA500.4?\u003c\/h3\u003e\n\u003cp\u003eThis marine amplifier is the smart choice for boat owners, Jeep builds, and anyone who needs a 4-channel amp that can handle moisture, salt air, and the elements without skipping a beat. The compact footprint fits tight installs, and the Class D efficiency keeps heat low even in enclosed spaces. Pair it with marine-rated speakers and you've got a system built to last season after season.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eProfessional installation available at Best Auto Sound \u0026amp; Security in Central Texas. Contact us to schedule your build.\u003c\/em\u003e\u003c\/p\u003e","brand":"Cadence Sound","offers":[{"title":"Default Title","offer_id":44025584418929,"sku":"SQA500.4","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0684\/4884\/5937\/files\/Screenshot_13-8-2026_114634_cadencesound.com.jpg?v=1786639701","url":"https:\/\/12volttoys.com\/products\/cadence-sound-sqa500-4-4-channel-marine-class-d-amplifier","provider":"Best Auto Sound \u0026 Security","version":"1.0","type":"link"}