{"title":"Zapco Reference Series","description":"\u003csection id=\"comp-ml9a2x1c1\" class=\"Oqnisf comp-ml9a2x1c1 wixui-section\" data-block-level-container=\"ClassicSection\" tabindex=\"-1\"\u003e\n\u003cdiv data-mesh-id=\"comp-ml9a2x1c1inlineContent\" data-testid=\"inline-content\" class=\"\"\u003e\n\u003cdiv data-mesh-id=\"comp-ml9a2x1c1inlineContent-gridContainer\" data-testid=\"mesh-container-content\"\u003e\n\u003cdiv id=\"comp-ml9a2x1d4\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-ml9a2x1d4 wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch1 class=\"font_7 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_15 wixui-rich-text__text\"\u003eThe Reference Series is back, better then ever.\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp class=\"font_7 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_15 wixui-rich-text__text\"\u003eConceived several years ago to replace the Studio Series, the first Reference Series amplifier range was completed in 2001. The Reference Series (originally called AG) marked ZAPCO's first attempt to bring the qualities that had built the ZAPCO legend to a line of amplifiers accessible to all. The response exceeded the company's wildest expectations.\u003cbr class=\"wixui-rich-text__text\"\u003eZAPCO presents today the new Reference Series, not to offer an amplifier accessible to everyone, but to offer the best amplifier in its price range, with four new models of 1, 2, 4, and 6 channels, with a classy new design and selected internal components, to obtain the best audio performance. The new Reference Series amplifiers sound as good as, or better than, other companies’ most expensive amps. \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_7 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_15 wixui-rich-text__text\"\u003eTo achieve the highest sound quality, Zapco's Class AB amplifier designs have been thoroughly tested over decades. To deliver superior sound quality, it all depends on the components used, which are built by equally renowned manufacturers. These components are selected based on reliability and durability, maximum sound quality, and extremely tight tolerances. Everything must be compatible with the power ratings and interconnectivity with other components for a better signal-to-noise ratio and lower distortion.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"comp-ml9a2x1i\" class=\"comp-ml9a2x1i aVng1S wixui-horizontal-line\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"comp-ml9a2x1j3\" class=\"Oqnisf comp-ml9a2x1j3 wixui-section\" data-block-level-container=\"ClassicSection\" tabindex=\"-1\"\u003e\n\u003cdiv id=\"bgLayers_comp-ml9a2x1j3\" data-hook=\"bgLayers\" data-motion-part=\"BG_LAYER comp-ml9a2x1j3\" class=\"MW5IWV\"\u003e\n\u003cdiv id=\"bgMedia_comp-ml9a2x1j3\" data-motion-part=\"BG_MEDIA comp-ml9a2x1j3\" class=\"VgO9Yg\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-mesh-id=\"comp-ml9a2x1j3inlineContent\" data-testid=\"inline-content\" class=\"\"\u003e\n\u003cdiv data-mesh-id=\"comp-ml9a2x1j3inlineContent-gridContainer\" data-testid=\"mesh-container-content\"\u003e\n\u003cdiv id=\"comp-ml9a2x1k7\" class=\"EMmfSl\"\u003e\n\u003cdiv class=\"KS3m5U\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"comp-ml9a2x1l\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-ml9a2x1l wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch3 class=\"font_8 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eInternal Components Highlights \u003c\/span\u003e\u003c\/h3\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eTransformers\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eMost of the transformers used in our products are hand-wound in our own facility to ensure maximum quality. This is the only way that current capability, efficiency, and radiated noise can all be kept within our demanding parameters. All transformers are securely mounted in their respective chassis. Transformers are massive, and if not securely mounted can cause failure among internal components due to vibration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e- High-power chrome shielded toroidal transformers\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e- Optimized to reduce losses and handle high currents\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e- High-temperature resistance, high permeability and insulation performance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e- Transformer core with full copper wire windings\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e- Low ESR, highly efficient\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e \u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eFinal Power Transistors \u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eThe output transistors used by the Reference amplifiers are the well-known complementary Sanken MN1526 and MP1526. They guarantee 260 of voltage handling and 15A of maximum current. The transistors have constant hFE characteristics over a wide current range, which provide high-quality audio.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eSignal Path and Power Capacitors \u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eFor the signal path we used the ELNA Series RA3 and RFS, then for the power supplies we cooperated with SAMSON to produce our own capacitors. It is not a matter what the brand is, what Zapco engineering are looking are for performances of Leakage Current, Tangent and loss angle, Vibration Resistance, High Temperature Loading Life, and Tolerances. SAMSON SHP series was used for 3300 and 4700 microfarad and SKM series for 2200 microfarad.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003ePower Resistors\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eThe Power Resistors (model BWL 5W R1 B by Token) have Low Inductance, Excellent load life stability, Low temperature coefficient, Cooler operation for high power to size ratio. Proprietary processing technique to produce extremely low resistance values.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eCapacitors\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eCapacitors come in many types and are basically divided into solid-dielectric capacitors (there are several different types), which typically have low capacitances and high operating voltages, and liquid-dielectric capacitors (commonly called electrolytic capacitors), which have high capacitances. Both are important for an audio amplifier because the former ensure minimal distortion in the signal path, while the latter act as filters on the power supply states and are therefore responsible for the noise generated.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eInput Capacitors\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eAmong the capacitors in the signal path, those positioned near the inputs are more responsible for providing a distortion-free signal and therefore require higher quality materials and construction processes. Zapco use Revenbi MKPA-B capacitors that are Metallized Polypropylene Film Capacitor 250V with 3% Tolerance HIFI special made for Audio Professional use.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eBalanced\/Unbalanced Systems\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003eThe electrical environment in an automobile is one that is inherently noisy and filled with conditions that threaten to degrade signal fidelity at every turn. Capacitive loading due to the long cable lengths, the potential for ground loops, alternator charging currents or currents generated by the amplifiers themselves are all factors that induce noise and distortion into the signal cables. By no means is this an ideal situation. ZAPCO has found the solution many years ago with SymbiLink components, converting a standard unbalanced audio signal into the fully balanced domain. At that time the SymbiLink connection was realized by two separate inputs. Today the same solution is realized with balanced input by RCA and unbalanced input through a button that is collocated inside the amplifier.\u003c\/span\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_1 wixui-rich-text__text\"\u003eOur Dedication to Sonic Purity Requires the Highest of Quality in Internal Component Parts\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e \u003c\/p\u003e\n\u003ch4\u003eUpgradable OPs \u003c\/h4\u003e\n\u003cp\u003eHigh quality OP, ideal for high-end audio equipment reproducing the finest sound such as live sound of orchestra in the hall and breathing sound of player in live music. The provided MUSES8820 is a two step an higher level of sound quality respect the LME49720. We consider one step an easy minum perception of a better sound quality. The Reference amplifiers offer the possibility of replacing the original OPs (MUSES8820) with even higher-performance OPs (MUSES02), or with other OPs the customer prefers. This operation can be done quite easily, since the OPs are mounted on sockets and not soldered. The MUSES02 surpass the quality of the MUSES8820 two steps more. It is 4 steps an higher level than the LME49720 similar discrete OP.\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e \u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e \u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/REF_inside.avif?v=1771885474\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","products":[{"product_id":"ref-250-2","title":"REF 250.2 | Zapco Reference Series 2-Ch 500 watt Class A\/B High-End Amplifier","description":"\u003cdiv id=\"bgLayers_comp-mlaogxrq\" data-hook=\"bgLayers\" data-motion-part=\"BG_LAYER comp-mlaogxrq\" class=\"MW5IWV\"\u003e\n\u003cdiv id=\"bgMedia_comp-mlaogxrq\" data-motion-part=\"BG_MEDIA comp-mlaogxrq\" class=\"VgO9Yg\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-mesh-id=\"comp-mlaogxrqinlineContent\" data-testid=\"inline-content\" class=\"\"\u003e\n\u003cdiv data-mesh-id=\"comp-mlaogxrqinlineContent-gridContainer\" data-testid=\"mesh-container-content\"\u003e\n\u003cdiv id=\"comp-mlaop2bi\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-mlaop2bi wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch1 class=\"font_2 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_1 wixui-rich-text__text\"\u003eREF 250.2\u003c\/span\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"comp-mlaop2bl\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-mlaop2bl wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch1 class=\"font_2 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_1 wixui-rich-text__text\"\u003e2-Ch. Class AB High-End Amplifier\u003c\/span\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFeatures and Functions\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- 2-Channel, Class-AB, High-End Amplifier\u003cbr\u003e- Signal to noise ratio of over 104dB\u003cbr\u003e- High Quality Bipolar-input Dual OP\u003cbr\u003e- High Quality\/Transition Frequency Transistors\u003cbr\u003e- High-precision 0.1% Output Resistors\u003cbr\u003e- High density, Loss factor Input Capacitors\u003cbr\u003e- Low internal resistance Power Capacitors\u003cbr\u003e- Ultra Low On-Resistance, Fast Switching Mosfets\u003cbr\u003e- High-power pure copper transformers\u003cbr\u003e- Low Resistance Fuses\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- Power RMS @ 4Ω: 2 x 250 watts\u003cbr\u003e- Power RMS @ 2Ω: 2 x 350 watts\u003cbr\u003e- Power RMS @ 4Ω Bridged: 1 x 800 watts\u003cbr\u003e- THD @ Rated Power \u0026lt; 0.02%\u003cbr\u003e- Signal to Noise Ratio \u0026gt; 104dB\u003cbr\u003e- Frequency Response: 10Hz to 40,000Hz ±1dB\u003cbr\u003e- Input Sensitivity: 0.5V to 8V\u003cbr\u003e- Fuse Rating: 2 x 40A\u003cbr\u003e- Overall Dimensions (mm): 210(W) x 62(H) x 416(L)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":52381014163745,"sku":"R252","price":1399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/0bf3d1_b0ea2776d91442da9090d32c8fdb5146_mv2.avif?v=1771885767"},{"product_id":"ref-150-4","title":"REF 150.4 | Zapco Reference Series 4-Ch 600 watt Class AB High-End Amplifier","description":"\u003ch1 style=\"text-align: center;\"\u003eREF 150.4\u003cbr\u003e4-Ch. Class AB High-End Amplifier\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFeatures and Functions\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- 4-Channel, Class-AB, High-End Amplifier\u003cbr\u003e- Signal to noise ratio of over 104dB\u003cbr\u003e- High Quality Bipolar-input Dual OP\u003cbr\u003e- High Quality\/Transition Frequency Transistors\u003cbr\u003e- High-precision 0.1% Output Resistors\u003cbr\u003e- High density, Loss factor Input Capacitors\u003cbr\u003e- Low internal resistance Power Capacitors\u003cbr\u003e- Ultra Low On-Resistance, Fast Switching Mosfets\u003cbr\u003e- High-power pure copper transformers\u003cbr\u003e- Low Resistance Fuses\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- Power RMS @ 4Ω: 4 x 150 watts\u003cbr\u003e- Power RMS @ 2Ω: 4 x 230 watts\u003cbr\u003e- Power RMS @ 4Ω Bridged: 2 x 470 watts\u003cbr\u003e- THD @ Rated Power \u0026lt; 0.02%\u003cbr\u003e- Signal to Noise Ratio \u0026gt; 102dB\u003cbr\u003e- Frequency Response: 10Hz to 40,000Hz ±1dB\u003cbr\u003e- Input Sensitivity: 0.5V to 8V\u003cbr\u003e- Fuse Rating: 2 x 40A\u003cbr\u003e- Overall Dimensions (mm): 210(W) x 62(H) x 416(L)\u003c\/p\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":52381015834913,"sku":"R154","price":1599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/0bf3d1_ff136d48119f45ea97292a0f62379c47_mv2.avif?v=1771886171"},{"product_id":"ref-150-6","title":"REF 150.6 | Zapco Reference Series 6-Ch 900 watt Class AB High-End Amplifier","description":"\u003ch1 style=\"text-align: center;\"\u003eREF 150.6\u003cbr\u003e6-Ch. Class AB High-End Amplifier\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFeatures and Functions\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- 6-Channel, Class-AB, High-End Amplifier\u003cbr\u003e- Signal to noise ratio of over 102dB\u003cbr\u003e- High Quality Bipolar-input Dual OP\u003cbr\u003e- High Quality\/Transition Frequency Transistors\u003cbr\u003e- High-precision 0.1% Output Resistors\u003cbr\u003e- High density, Loss factor Input Capacitors\u003cbr\u003e- Low internal resistance Power Capacitors\u003cbr\u003e- Ultra Low On-Resistance, Fast Switching Mosfets\u003cbr\u003e- High-power pure copper transformers\u003cbr\u003e- Low Resistance Fuses\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- Power RMS @ 4Ω: 6 x 150 watts\u003cbr\u003e- Power RMS @ 2Ω: 6 x 220 watts\u003cbr\u003e- Power RMS @ 4Ω Bridged: 3 x 450 watts\u003cbr\u003e- THD @ Rated Power \u0026lt; 0.02%\u003cbr\u003e- Signal to Noise Ratio \u0026gt; 102dB\u003cbr\u003e- Frequency Response: 10Hz to 40,000Hz ±1dB\u003cbr\u003e- Input Sensitivity: 0.5V to 8V\u003cbr\u003e- Fuse Rating: 3 x 40A\u003cbr\u003e- Overall Dimensions (mm): 210(W) x 62(H) x 480(L)\u003c\/p\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":52381015867681,"sku":"R156","price":1999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/0bf3d1_e43442c4c0574259a93e3b7955c8369c_mv2.avif?v=1771886422"},{"product_id":"ref-500-1","title":"REF 500.1 | Zapco Refrence Series 1-Ch 500 watt Class AB High-End Amplifier","description":"\u003cdiv id=\"bgLayers_comp-mlaogxrq\" data-hook=\"bgLayers\" data-motion-part=\"BG_LAYER comp-mlaogxrq\" class=\"MW5IWV\"\u003e\n\u003cdiv id=\"bgMedia_comp-mlaogxrq\" data-motion-part=\"BG_MEDIA comp-mlaogxrq\" class=\"VgO9Yg\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-mesh-id=\"comp-mlaogxrqinlineContent\" data-testid=\"inline-content\" class=\"\"\u003e\n\u003cdiv data-mesh-id=\"comp-mlaogxrqinlineContent-gridContainer\" data-testid=\"mesh-container-content\"\u003e\n\u003cdiv id=\"comp-mlaop2bi\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-mlaop2bi wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch1 class=\"font_2 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_1 wixui-rich-text__text\"\u003eREF 500.1\u003c\/span\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"comp-mlaop2bl\" class=\"ku3DBC zQ9jDz qvSjx3 Vq6kJx comp-mlaop2bl wixui-rich-text\" data-testid=\"richTextElement\"\u003e\n\u003ch1 class=\"font_2 wixui-rich-text__text\" style=\"text-align: center;\"\u003e\u003cspan class=\"wixui-rich-text__text\"\u003e\u003cspan class=\"color_1 wixui-rich-text__text\"\u003e1-Ch. Class AB High-End Amplifier\u003c\/span\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFeatures and Functions\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- 1-Channel, Class-AB, High-End Amplifier\u003cbr\u003e- Signal to noise ratio of over 103dB\u003cbr\u003e- High Quality Bipolar-input Dual OP\u003cbr\u003e- High Quality\/Transition Frequency Transistors\u003cbr\u003e- High-precision 0.1% Output Resistors\u003cbr\u003e- High density, Loss factor Input Capacitors\u003cbr\u003e- Low internal resistance Power Capacitors\u003cbr\u003e- Ultra Low On-Resistance, Fast Switching Mosfets\u003cbr\u003e- High-power pure copper transformers\u003cbr\u003e- Low Resistance Fuses\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e- Power RMS @ 4Ω: 1 x 320 watts\u003cbr\u003e- Power RMS @ 2Ω: 1 x 550 watts\u003cbr\u003e- THD @ Rated Power \u0026lt; 0.02%\u003cbr\u003e- Signal to Noise Ratio \u0026gt; 102dB\u003cbr\u003e- Frequency Response: 10Hz to 40,000Hz ±1dB\u003cbr\u003e- Input Sensitivity: 0.5V to 8V\u003cbr\u003e- Fuse Rating: 2 x 40A\u003cbr\u003e- Overall Dimensions (mm): 210(W) x 62(H) x 416(L)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Zapco","offers":[{"title":"Default Title","offer_id":52381015933217,"sku":"R501","price":1199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/files\/0bf3d1_de2bdf62c69a4f7691ab4e25ad7e27bd_mv2.avif?v=1771886586"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/1145\/9873\/collections\/REF_inside.png?v=1771885605","url":"https:\/\/www.shopalumapro.com\/collections\/zapco-reference-series.oembed","provider":"ShopAlumapro.com","version":"1.0","type":"link"}