{"product_id":"quest-qx4300-professional-4-300w-class-d-1ru-installation-power-amplifier-with-auto-load-sensing-70v-100v-dsp-control","title":"Quest QX4300 Professional 4×300W Class-D 1RU Installation Power Amplifier with Auto Load Sensing, 70V\/100V \u0026 DSP Control","description":"\u003cp data-start=\"148\" data-end=\"763\"\u003eThe Quest QX4300 is a professional 4-channel Class-D installation power amplifier engineered for commercial audio systems, multi-zone distributed sound applications, hospitality venues, educational facilities, houses of worship, AV integration, and high-performance residential installations requiring compact form factor, flexible impedance operation, and reliable continuous-duty performance. As part of Quest Engineering’s advanced QX Rackmount Series, the QX4300 combines ultra-efficient Class-D amplification, intelligent load sensing, and installation-focused processing features within a compact 1RU chassis.\u003c\/p\u003e\n\u003cp data-start=\"765\" data-end=\"1230\"\u003eDesigned for modern commercial and AV environments, the QX4300 delivers 4 × 300W output power per channel with automatic load sensing capability supporting both low-impedance (4–16Ω) and high-impedance (70V\/100V) speaker systems without manual switching. This flexible architecture simplifies installation while enabling the amplifier to integrate seamlessly into distributed audio infrastructures and multi-zone sound systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1232\" data-end=\"1686\"\u003eThe amplifier incorporates Quest’s UMAC™ full-bandwidth PWM Class-D modulation technology with ultra-low distortion, delivering clean and efficient audio performance while minimizing heat generation and power consumption. Integrated HPF, LPF, limiter, and standby controls are independently selectable per channel, allowing system integrators to configure speaker optimization directly within the amplifier platform. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1688\" data-end=\"2080\"\u003eEngineered for professional reliability, the QX4300 includes comprehensive protection systems including short-circuit, DC, under-voltage, overload, temperature, and HF protection. The advanced UREC™ universal switch-mode power supply with power factor correction improves efficiency and operational stability during demanding continuous-use applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2082\" data-end=\"2398\"\u003eThe compact 1RU rack-mount chassis makes the QX4300 ideal for AV racks and centralized commercial audio systems where space efficiency and channel density are critical. Optional Dante™\/AES67 expansion capability further enhances integration into networked audio infrastructures. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"o3tx9j\" data-start=\"2400\" data-end=\"2427\"\u003ePerformance Highlights:\u003c\/h3\u003e\n\u003cp data-start=\"2428\" data-end=\"2719\"\u003e• Professional 4-channel 1RU Class-D installation amplifier\u003cbr data-start=\"2487\" data-end=\"2490\"\u003e• 4 × 300W output power for distributed audio systems\u003cbr data-start=\"2543\" data-end=\"2546\"\u003e• Auto Load Sensing supports 4–16Ω, 70V \u0026amp; 100V operation\u003cbr data-start=\"2602\" data-end=\"2605\"\u003e• Independent HPF, LPF, limiter \u0026amp; standby controls per channel\u003cbr data-start=\"2667\" data-end=\"2670\"\u003e• Dante™ \/ AES67 expansion capability available\u003c\/p\u003e\n\u003ch2 data-section-id=\"1071k5m\" data-start=\"2721\" data-end=\"2755\"\u003eWhy You Should Buy This Product\u003c\/h2\u003e\n\u003cp data-start=\"2757\" data-end=\"3111\"\u003e• ⭐ Ultra-compact 1RU design maximizes rack efficiency\u003cbr data-start=\"2811\" data-end=\"2814\"\u003e• ⭐ Flexible low-impedance and 70V\/100V compatibility simplifies installations\u003cbr data-start=\"2892\" data-end=\"2895\"\u003e• ⭐ Energy-efficient Class-D platform reduces heat and power consumption\u003cbr data-start=\"2967\" data-end=\"2970\"\u003e• ⭐ Ideal for multi-zone commercial audio and AV integration systems\u003cbr data-start=\"3038\" data-end=\"3041\"\u003e• ⭐ Advanced protection systems ensure reliable continuous operation\u003c\/p\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"3113\" data-end=\"3128\"\u003eKey Features\u003c\/h2\u003e\n\u003cp data-start=\"3130\" data-end=\"3652\"\u003e• 4-channel professional installation amplifier\u003cbr data-start=\"3177\" data-end=\"3180\"\u003e• 4 × 300W power output\u003cbr data-start=\"3203\" data-end=\"3206\"\u003e• UMAC™ Class-D full-bandwidth PWM modulation\u003cbr data-start=\"3251\" data-end=\"3254\"\u003e• Auto Load Sensing (4–16Ω \/ 70V \/ 100V)\u003cbr data-start=\"3294\" data-end=\"3297\"\u003e• Individual HPF, LPF, limiter \u0026amp; standby controls per channel\u003cbr data-start=\"3358\" data-end=\"3361\"\u003e• Dante™ \/ AES67 expansion card compatibility\u003cbr data-start=\"3406\" data-end=\"3409\"\u003e• UREC™ switch-mode power supply with PFC\u003cbr data-start=\"3450\" data-end=\"3453\"\u003e• Euroblock input\/output connectors\u003cbr data-start=\"3488\" data-end=\"3491\"\u003e• DynamiQ Bass Technology®\u003cbr data-start=\"3517\" data-end=\"3520\"\u003e• Energy Star compliant standby operation\u003cbr data-start=\"3561\" data-end=\"3564\"\u003e• Fast 1ms wake-up time from standby\u003cbr data-start=\"3600\" data-end=\"3603\"\u003e• Designed, engineered \u0026amp; assembled in Australia\u003c\/p\u003e\n\u003ch1 data-section-id=\"zjxypn\" data-start=\"3654\" data-end=\"3680\"\u003eTechnical Specifications\u003c\/h1\u003e\n\u003ch2 data-section-id=\"1ykprhv\" data-start=\"3682\" data-end=\"3692\"\u003eGeneral\u003c\/h2\u003e\n\u003cp data-start=\"3694\" data-end=\"3789\"\u003e• Product Type: Multi-Channel Installation Power Amplifier\u003cbr data-start=\"3752\" data-end=\"3755\"\u003e• Brand: Quest\u003cbr data-start=\"3769\" data-end=\"3772\"\u003e• Model: QX4300\u003c\/p\u003e\n\u003ch2 data-section-id=\"1khwwct\" data-start=\"3791\" data-end=\"3813\"\u003eAudio \u0026amp; Performance\u003c\/h2\u003e\n\u003cp data-start=\"3815\" data-end=\"4088\"\u003e• Amplifier Channels: 4 Channels\u003cbr data-start=\"3847\" data-end=\"3850\"\u003e• Output Power: 4 × 300W\u003cbr data-start=\"3874\" data-end=\"3877\"\u003e• Amplifier Class: Class-D\u003cbr data-start=\"3903\" data-end=\"3906\"\u003e• Frequency Response: —\u003cbr data-start=\"3929\" data-end=\"3932\"\u003e• Total Harmonic Distortion: Ultra-Low Distortion UMAC™ Design\u003cbr data-start=\"3994\" data-end=\"3997\"\u003e• Dynamic Range Technology: DynamiQ Bass Technology® \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"zfpcnp\" data-start=\"4090\" data-end=\"4107\"\u003ePower Handling\u003c\/h2\u003e\n\u003cp data-start=\"4109\" data-end=\"4279\"\u003e• Low-Impedance Operation: 4–16Ω\u003cbr data-start=\"4141\" data-end=\"4144\"\u003e• High-Impedance Operation: 70V \/ 100V\u003cbr data-start=\"4182\" data-end=\"4185\"\u003e• Auto Load Sensing: Yes\u003cbr data-start=\"4209\" data-end=\"4212\"\u003e• Bridge Mode: Not Supported \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"18e5g2k\" data-start=\"4281\" data-end=\"4305\"\u003eProcessing \u0026amp; Controls\u003c\/h2\u003e\n\u003cp data-start=\"4307\" data-end=\"4487\"\u003e• High Pass Filter: 80Hz HPF\u003cbr data-start=\"4335\" data-end=\"4338\"\u003e• Low Pass Filter: 100Hz LPF\u003cbr data-start=\"4366\" data-end=\"4369\"\u003e• Input Limiter: Selectable\u003cbr data-start=\"4396\" data-end=\"4399\"\u003e• Standby Mode: Per Channel\u003cbr data-start=\"4426\" data-end=\"4429\"\u003e• Wake-Up Time: 1ms \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"ujm01s\" data-start=\"4489\" data-end=\"4504\"\u003eConnectivity\u003c\/h2\u003e\n\u003cp data-start=\"4506\" data-end=\"4683\"\u003e• Audio Inputs: Euroblock \/ Phoenix Connectors\u003cbr data-start=\"4552\" data-end=\"4555\"\u003e• Speaker Outputs: Euroblock Outputs\u003cbr data-start=\"4591\" data-end=\"4594\"\u003e• Network Audio Expansion: Dante™ \/ AES67 Optional \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"1u06rja\" data-start=\"4685\" data-end=\"4698\"\u003eProtection\u003c\/h2\u003e\n\u003cp data-start=\"4700\" data-end=\"4911\"\u003e• Short Circuit Protection: Yes\u003cbr data-start=\"4731\" data-end=\"4734\"\u003e• DC Protection: Yes\u003cbr data-start=\"4754\" data-end=\"4757\"\u003e• Under Voltage Protection: Yes\u003cbr data-start=\"4788\" data-end=\"4791\"\u003e• Temperature Protection: Yes\u003cbr data-start=\"4820\" data-end=\"4823\"\u003e• Overload Protection: Yes\u003cbr data-start=\"4849\" data-end=\"4852\"\u003e• HF Protection: Yes \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"16n806i\" data-start=\"4913\" data-end=\"4939\"\u003ePhysical \u0026amp; Installation\u003c\/h2\u003e\n\u003cp data-start=\"4941\" data-end=\"5154\"\u003e• Rack Space: 1RU\u003cbr data-start=\"4958\" data-end=\"4961\"\u003e• Chassis Construction: Metal\u003cbr data-start=\"4990\" data-end=\"4993\"\u003e• Finish: Black\u003cbr data-start=\"5008\" data-end=\"5011\"\u003e• Cooling System: Fan-Cooled Temperature-Dependent Cooling\u003cbr data-start=\"5069\" data-end=\"5072\"\u003e• Dimensions: 19” Rack Width × 345 mm Depth \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"1kmusxh\" data-start=\"5156\" data-end=\"5172\"\u003eConfiguration\u003c\/h2\u003e\n\u003cp data-start=\"5174\" data-end=\"5440\"\u003e• Amplifier Type: Installation Power Amplifier\u003cbr data-start=\"5220\" data-end=\"5223\"\u003e• System Type: Multi-Zone Commercial Audio Amplifier\u003cbr data-start=\"5275\" data-end=\"5278\"\u003e• Built-in DSP: Basic Filter \u0026amp; Limiter Processing\u003cbr data-start=\"5327\" data-end=\"5330\"\u003e• Transformer: Integrated Hi-Z Operation Support\u003cbr data-start=\"5378\" data-end=\"5381\"\u003e• Mode: Low \u0026amp; High Impedance Professional Audio Operation\u003c\/p\u003e\n\u003ch2 data-section-id=\"ntyisd\" data-start=\"5442\" data-end=\"5453\"\u003eIncluded\u003c\/h2\u003e\n\u003cp data-start=\"5455\" data-end=\"5544\"\u003e• 1 × 4-Channel Installation Power Amplifier\u003cbr data-start=\"5499\" data-end=\"5502\"\u003e• 1 × Power Cable\u003cbr data-start=\"5519\" data-end=\"5522\"\u003e• User Documentation\u003c\/p\u003e","brand":"Quest","offers":[{"title":"Default Title","offer_id":52966290293055,"sku":"Quest QX4300","price":308100.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/5942\/1272\/files\/QX4300_01.webp?v=1778676797","url":"https:\/\/audiomaxx.in\/products\/quest-qx4300-professional-4-300w-class-d-1ru-installation-power-amplifier-with-auto-load-sensing-70v-100v-dsp-control","provider":"Audiomaxx India","version":"1.0","type":"link"}