{"product_id":"zapco-mono-class-ab-amplifier","title":"ZAPCO Mono Class AB Amplifier for High Power Sound","description":"\u003cdiv classname=\"product-description\"\u003e\n  \u003ch2\u003eZapco ST-1B Mono Class AB Amplifier\u003c\/h2\u003e\n\n\n  \u003cp\u003e\u003cstrong\u003eSerious subwoofer power. Serious sound quality.\u003c\/strong\u003e\u003c\/p\u003e\n\n\n  \u003cp\u003eThe Zapco ST-1B is a mono Class AB amplifier built for one job: delivering clean, distortion-free power to your subwoofer system. No compromises, no current limiting, no shortcuts—just pure Zapco engineering with 40 years of audio heritage backing every watt.\u003c\/p\u003e\n\n\n  \u003ch3\u003eWhy the ST-1B?\u003c\/h3\u003e\n\n\n  \u003cp\u003eThis isn't a budget amp. The ST-1B is engineered for audiophiles and serious car audio enthusiasts who refuse to sacrifice sound quality for power. Unlike Class D amps that prioritize compact size, the ST-1B uses Class AB topology to deliver superior dynamic range and sonic purity. That means your bass hits harder, stays cleaner, and never sounds compressed—even at full volume.\u003c\/p\u003e\n\n\n  \u003ch4\u003eKey advantages:\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSuperior dynamic range\u003c\/strong\u003e – More headroom between quiet passages and peak power without distortion\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClass AB efficiency\u003c\/strong\u003e – Optimized for sound quality over size\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlexible wiring\u003c\/strong\u003e – Run one 2Ω sub or two 4Ω subs from the same amp\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFull control\u003c\/strong\u003e – Variable gain, bass boost (0–12dB), phase control (0–180°), and subsonic filter\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProfessional installation\u003c\/strong\u003e – RCA inputs\/outputs, remote control port, and clean integration\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\n  \u003ch3\u003eBuilt for Real-World Installs\u003c\/h3\u003e\n\n\n  \u003cp\u003eThe ST-1B integrates seamlessly into any car audio system. Pass-through RCA outputs let you daisy-chain additional amps, while the subsonic filter eliminates frequencies below your sub's capability—protecting your equipment and tightening your bass response. The variable low-pass crossover and phase control give you precise tuning for any vehicle acoustics.\u003c\/p\u003e\n\n\n  \u003ch4\u003eInstallation-ready features:\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eMOSFET power supply for stable, clean power delivery\u003c\/li\u003e\n    \u003cli\u003eVariable input gain control (set to minimum before initial turn-on)\u003c\/li\u003e\n    \u003cli\u003e0–180° phase adjustment for perfect integration with front speakers\u003c\/li\u003e\n    \u003cli\u003eSubsonic filter to protect your subwoofer and reduce cabin resonance\u003c\/li\u003e\n    \u003cli\u003eRemote control port for convenient gain adjustment from the driver's seat\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\n  \u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\"\u003e\n    \u003ctr style=\"border-bottom: 2px solid #333;\"\u003e\n      \u003cth style=\"text-align: left; padding: 10px; font-weight: bold;\"\u003eSpec\u003c\/th\u003e\n      \u003cth style=\"text-align: left; padding: 10px; font-weight: bold;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e1-Channel Class AB Amplifier\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003ePower @ 4Ω\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e200 watts RMS\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003ePower @ 2Ω\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e300 watts RMS\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eTHD\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u0026lt; 0.2% (extremely clean)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eSignal-to-Noise Ratio\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u0026gt; 90dB\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e15Hz–30KHz ±1dB\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eInput Sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e0.25V–5V (adjustable)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #ddd;\"\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eDimensions (net)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e182(W) × 52(H) × 280(L) mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e\u003cstrong\u003eDimensions (overall)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 10px;\"\u003e182(W) × 52(H) × 310(L) mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/table\u003e\n\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\n\n  \u003cp\u003eThe ST-1B requires adequate ventilation—mounting in the trunk with airflow is ideal. Always use proper power and ground wire sizing (consult the included wire sizing chart based on your installation distance). A fuse or circuit breaker within 18\" of the battery is essential for safety.\u003c\/p\u003e\n\n\n  \u003ch4\u003eWiring flexibility:\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eSingle 2Ω subwoofer minimum\u003c\/li\u003e\n    \u003cli\u003eTwo 4Ω subwoofers minimum each\u003c\/li\u003e\n    \u003cli\u003eRCA or high-level (speaker-level) inputs\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\n  \u003chr style=\"margin: 30px 0; border: none; border-top: 1px solid #ddd;\"\u003e\n\n\n  \u003ch3\u003eSEO Meta Description\u003c\/h3\u003e\n  \u003cp style=\"background-color: #f5f5f5; padding: 15px; border-left: 4px solid #333;\"\u003e\n    Zapco ST-1B mono amplifier: 200W @ 4Ω \/ 300W @ 2Ω Class AB subwoofer amp. Superior sound quality, variable crossover, phase control \u0026amp; subsonic filter. Professional car audio installation.\n  \u003c\/p\u003e\n  \u003cp style=\"font-size: 12px; color: #666;\"\u003eCharacter count: 165 characters (optimal for search results)\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n","brand":"zapco","offers":[{"title":"Default Title","offer_id":49423886549270,"sku":"ST-1B","price":299.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/0360\/9622\/files\/zapco-mono-class-ab-amplifier-for-high-power-soundmono-amplifierzapcogarage-audiost-1bst-1b-2070333.jpg?v=1771516446","url":"https:\/\/shop.garageaudio.com.au\/products\/zapco-mono-class-ab-amplifier","provider":"Garage Audio | Vehicle Technology \u0026 Accessories","version":"1.0","type":"link"}