{"product_id":"st-4b","title":"ST-4B | Zapco ST-B Series 4-Ch 260 watt Class AB Amplifier","description":"\u003ch1 style=\"text-align: center;\"\u003eST-4B 4-Ch. Class AB Amplifier\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1 style=\"text-align: center;\"\u003eFeatures and Functions\u003c\/h1\u003e\n\u003cp style=\"text-align: center;\"\u003e- 4-Channel, Class-AB Full Range Amplifier\u003cbr\u003e- Stable into 4 ohms bridged or 2 ohms stereo load\u003cbr\u003e- MOSFET power supply\u003cbr\u003e- RCA and OEM speaker level input\u003cbr\u003e- Variable Inputs Gain Control\u003cbr\u003e- Variable FULL \/ LP \/ HP Electronic Crossover\u003cbr\u003e- Variable Bass Boost\u003c\/p\u003e\n\u003ch1 style=\"text-align: center;\"\u003eTechnical Specifications\u003c\/h1\u003e\n\u003cp style=\"text-align: center;\"\u003e- Power @ 4Ω: 4 x 65 watts\u003cbr\u003e- Power @ 2Ω: 4 x 90 watts\u003cbr\u003e- Power @ 4Ω Bridged: 2 x 180 watts\u003cbr\u003e- THD @ Rated Power \u0026lt; 0.2%\u003cbr\u003e- Signal to Noise Ratio \u0026gt; 90dB\u003cbr\u003e- Channel separation \u0026gt; 45dB\u003cbr\u003e- Frequency Response 10Hz to 20KHz ±1dB\u003cbr\u003e- Input Sensitivity .25v to 5v\u003cbr\u003e- Overall Dimensions (mm): 182(W) x 52(H) x 310(L)\u003c\/p\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":52381028679969,"sku":"ZS4B","price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/ST-4B_0.jpg?v=1771882270","url":"https:\/\/www.shopalumapro.com\/products\/st-4b","provider":"ShopAlumapro.com","version":"1.0","type":"link"}