{"product_id":"quest-qx4750-professional-4-750w-class-d-2ru-installation-power-amplifier-with-auto-load-sensing-70v-100v-dante™-expansion-support","title":"Quest QX4750 Professional 4×750W Class-D 2RU Installation Power Amplifier with Auto Load Sensing, 70V\/100V \u0026 Dante™ Expansion Support","description":"\u003cp data-start=\"161\" data-end=\"803\"\u003eThe Quest QX4750 is a professional high-performance 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-demand professional sound installations requiring exceptional output power, flexible impedance compatibility, and reliable continuous-duty operation. As part of Quest Engineering’s advanced QX Rackmount Series, the QX4750 combines powerful Class-D amplification, intelligent load sensing, and installation-focused DSP functionality within a rugged 2RU rack-mount chassis.\u003c\/p\u003e\n\u003cp data-start=\"805\" data-end=\"1271\"\u003eDesigned for demanding commercial and professional AV environments, the QX4750 delivers 4 × 750W output power at 4Ω with bridgeable channel operation capable of delivering 2 × 1500W for both low-impedance and high-impedance speaker systems. Auto Load Sensing technology allows seamless operation with 4–16Ω, 70V, and 100V systems without requiring manual reconfiguration, greatly simplifying large-scale installation deployment. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1273\" data-end=\"1779\"\u003eThe amplifier utilizes Quest’s UMAC™ full-bandwidth PWM Class-D modulation technology with ultra-low distortion, delivering outstanding dynamic range, exceptional efficiency, and clean high-output performance while minimizing heat generation and energy consumption. Individual channel controls include volume adjustment, 80Hz high-pass filter, 100Hz low-pass filter, limiter activation, standby mode, and bridge-mono configuration for maximum installation flexibility. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1781\" data-end=\"2268\"\u003eBuilt for professional reliability, the QX4750 incorporates comprehensive protection systems including thermal protection, over-current protection, DC protection, under-voltage protection, overload protection, and HF protection to ensure stable operation under demanding continuous-use conditions. The UREC™ universal switch-mode power supply with integrated Power Factor Correction (PFC) further enhances operational efficiency and power stability. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2270\" data-end=\"2628\"\u003eThe QX4750 also supports optional Dante™\/AES67 network audio expansion, making it suitable for modern networked AV infrastructures and enterprise-level distributed audio systems. Designed, engineered, and assembled in Australia, the amplifier delivers premium-grade performance for professional commercial installations. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"o3tx9j\" data-start=\"2630\" data-end=\"2657\"\u003ePerformance Highlights:\u003c\/h3\u003e\n\u003cp data-start=\"2658\" data-end=\"2922\"\u003e• Professional 4-channel 2RU Class-D installation amplifier\u003cbr data-start=\"2717\" data-end=\"2720\"\u003e• 4 × 750W output power @ 4Ω\u003cbr data-start=\"2748\" data-end=\"2751\"\u003e• Bridgeable to 2 × 1500W for low- or high-impedance systems\u003cbr data-start=\"2811\" data-end=\"2814\"\u003e• Auto Load Sensing supports 4–16Ω, 70V \u0026amp; 100V operation\u003cbr data-start=\"2870\" data-end=\"2873\"\u003e• Dante™ \/ AES67 expansion capability available\u003c\/p\u003e\n\u003ch2 data-section-id=\"1071k5m\" data-start=\"2924\" data-end=\"2958\"\u003eWhy You Should Buy This Product\u003c\/h2\u003e\n\u003cp data-start=\"2960\" data-end=\"3335\"\u003e• ⭐ Extremely powerful 4-channel amplifier for large-scale commercial systems\u003cbr data-start=\"3037\" data-end=\"3040\"\u003e• ⭐ Flexible low-impedance and 70V\/100V operation simplifies installations\u003cbr data-start=\"3114\" data-end=\"3117\"\u003e• ⭐ High-efficiency Class-D architecture reduces heat and power consumption\u003cbr data-start=\"3192\" data-end=\"3195\"\u003e• ⭐ Advanced protection systems ensure reliable long-term operation\u003cbr data-start=\"3262\" data-end=\"3265\"\u003e• ⭐ Dante™ expansion support enables modern networked AV integration\u003c\/p\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"3337\" data-end=\"3352\"\u003eKey Features\u003c\/h2\u003e\n\u003cp data-start=\"3354\" data-end=\"3902\"\u003e• 4-channel professional power amplifier\u003cbr data-start=\"3394\" data-end=\"3397\"\u003e• 4 × 750W @ 4Ω output power\u003cbr data-start=\"3425\" data-end=\"3428\"\u003e• 2 × 1500W bridged-mono capability\u003cbr data-start=\"3463\" data-end=\"3466\"\u003e• UMAC™ Class-D full-bandwidth PWM modulation\u003cbr data-start=\"3511\" data-end=\"3514\"\u003e• Auto Load Sensing (4–16Ω \/ 70V \/ 100V)\u003cbr data-start=\"3554\" data-end=\"3557\"\u003e• Individual HPF, LPF, limiter \u0026amp; standby controls per channel\u003cbr data-start=\"3618\" data-end=\"3621\"\u003e• Dante™ \/ AES67 expansion card compatibility\u003cbr data-start=\"3666\" data-end=\"3669\"\u003e• UREC™ switch-mode power supply with PFC\u003cbr data-start=\"3710\" data-end=\"3713\"\u003e• DynamiQ Bass Technology®\u003cbr data-start=\"3739\" data-end=\"3742\"\u003e• Euroblock balanced link connectors\u003cbr data-start=\"3778\" data-end=\"3781\"\u003e• SpeakON speaker outputs\u003cbr data-start=\"3806\" data-end=\"3809\"\u003e• Energy Star compliant standby operation\u003cbr data-start=\"3850\" data-end=\"3853\"\u003e• Designed, engineered \u0026amp; assembled in Australia\u003c\/p\u003e\n\u003ch1 data-section-id=\"zjxypn\" data-start=\"3904\" data-end=\"3930\"\u003eTechnical Specifications\u003c\/h1\u003e\n\u003ch2 data-section-id=\"1ykprhv\" data-start=\"3932\" data-end=\"3942\"\u003eGeneral\u003c\/h2\u003e\n\u003cp data-start=\"3944\" data-end=\"4039\"\u003e• Product Type: Multi-Channel Installation Power Amplifier\u003cbr data-start=\"4002\" data-end=\"4005\"\u003e• Brand: Quest\u003cbr data-start=\"4019\" data-end=\"4022\"\u003e• Model: QX4750\u003c\/p\u003e\n\u003ch2 data-section-id=\"1khwwct\" data-start=\"4041\" data-end=\"4063\"\u003eAudio \u0026amp; Performance\u003c\/h2\u003e\n\u003cp data-start=\"4065\" data-end=\"4527\"\u003e• Amplifier Channels: 4 Channels\u003cbr data-start=\"4097\" data-end=\"4100\"\u003e• Amplifier Class: Class-D\u003cbr data-start=\"4126\" data-end=\"4129\"\u003e• Frequency Response: 20 Hz – 20 kHz (±0.3 dB)\u003cbr data-start=\"4175\" data-end=\"4178\"\u003e• Dynamic Range: 111 dB (A-weighted)\u003cbr data-start=\"4214\" data-end=\"4217\"\u003e• Noise Level: -72 dBu (A-weighted)\u003cbr data-start=\"4252\" data-end=\"4255\"\u003e• Peak Output Current: 40A\u003cbr data-start=\"4281\" data-end=\"4284\"\u003e• Crosstalk (1kHz @ 1W \/ 8Ω): -90 dB\u003cbr data-start=\"4320\" data-end=\"4323\"\u003e• Gain: 26 dB \/ 32 dB\u003cbr data-start=\"4344\" data-end=\"4347\"\u003e• Maximum Input Level: +24 dBu\u003cbr data-start=\"4377\" data-end=\"4380\"\u003e• Total Harmonic Distortion (1kHz @ 1W \/ 8Ω): 0.004%\u003cbr data-start=\"4432\" data-end=\"4435\"\u003e• Total Harmonic Distortion (1kHz @ 50W \/ 8Ω): 0.003% \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"zfpcnp\" data-start=\"4529\" data-end=\"4546\"\u003ePower Handling\u003c\/h2\u003e\n\u003cp data-start=\"4548\" data-end=\"4867\"\u003e• Output Power @ 8Ω: 4 × 400W\u003cbr data-start=\"4577\" data-end=\"4580\"\u003e• Output Power @ 4Ω: 4 × 750W\u003cbr data-start=\"4609\" data-end=\"4612\"\u003e• Bridged Output @ 8Ω: 2 × 1500W\u003cbr data-start=\"4644\" data-end=\"4647\"\u003e• Bridged Output @ 4Ω: 2 × 1400W\u003cbr data-start=\"4679\" data-end=\"4682\"\u003e• Bridged Output @ 70V: 2 × 1500W\u003cbr data-start=\"4715\" data-end=\"4718\"\u003e• Bridged Output @ 100V: 2 × 1500W\u003cbr data-start=\"4752\" data-end=\"4755\"\u003e• Low-Impedance Operation: 4–16Ω\u003cbr data-start=\"4787\" data-end=\"4790\"\u003e• High-Impedance Operation: 70V \/ 100V \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"18e5g2k\" data-start=\"4869\" data-end=\"4893\"\u003eProcessing \u0026amp; Controls\u003c\/h2\u003e\n\u003cp data-start=\"4895\" data-end=\"5099\"\u003e• High Pass Filter: 80Hz HPF\u003cbr data-start=\"4923\" data-end=\"4926\"\u003e• Low Pass Filter: 100Hz LPF\u003cbr data-start=\"4954\" data-end=\"4957\"\u003e• Input Limiter: Selectable\u003cbr data-start=\"4984\" data-end=\"4987\"\u003e• Auto Standby Mode: Yes\u003cbr data-start=\"5011\" data-end=\"5014\"\u003e• Wake-Up Time: 1ms\u003cbr data-start=\"5033\" data-end=\"5036\"\u003e• Bridged Mono Mode: Yes \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"ujm01s\" data-start=\"5101\" data-end=\"5116\"\u003eConnectivity\u003c\/h2\u003e\n\u003cp data-start=\"5118\" data-end=\"5330\"\u003e• Audio Inputs: XLR Balanced Inputs \u0026amp; Euroblock Links\u003cbr data-start=\"5171\" data-end=\"5174\"\u003e• Speaker Outputs: SpeakON Outputs\u003cbr data-start=\"5208\" data-end=\"5211\"\u003e• Optional Expansion: Dante™ \/ AES67 Network Audio\u003cbr data-start=\"5261\" data-end=\"5264\"\u003e• Mains Connector: powerCON \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"1u06rja\" data-start=\"5332\" data-end=\"5345\"\u003eProtection\u003c\/h2\u003e\n\u003cp data-start=\"5347\" data-end=\"5553\"\u003e• Thermal Protection: Yes\u003cbr data-start=\"5372\" data-end=\"5375\"\u003e• Over-Current Protection: Yes\u003cbr data-start=\"5405\" data-end=\"5408\"\u003e• DC Protection: Yes\u003cbr data-start=\"5428\" data-end=\"5431\"\u003e• Under Voltage Protection: Yes\u003cbr data-start=\"5462\" data-end=\"5465\"\u003e• Overload Protection: Yes\u003cbr data-start=\"5491\" data-end=\"5494\"\u003e• HF Protection: Yes \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"16n806i\" data-start=\"5555\" data-end=\"5581\"\u003ePhysical \u0026amp; Installation\u003c\/h2\u003e\n\u003cp data-start=\"5583\" data-end=\"5809\"\u003e• Rack Space: 2RU\u003cbr data-start=\"5600\" data-end=\"5603\"\u003e• Chassis Construction: Metal\u003cbr data-start=\"5632\" data-end=\"5635\"\u003e• Finish: Black\u003cbr data-start=\"5650\" data-end=\"5653\"\u003e• Cooling System: Temperature-Dependent Fan Cooling\u003cbr data-start=\"5704\" data-end=\"5707\"\u003e• Dimensions (H × W × D): 88 × 482 × 416 mm\u003cbr data-start=\"5750\" data-end=\"5753\"\u003e• Weight: 10.2 kg \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"jd8yrj\" data-start=\"5811\" data-end=\"5831\"\u003ePower Consumption\u003c\/h2\u003e\n\u003cp data-start=\"5833\" data-end=\"5972\"\u003e• Standby Power Consumption: 4.8W\u003cbr data-start=\"5866\" data-end=\"5869\"\u003e• Muted Power Consumption: 16W\u003cbr data-start=\"5899\" data-end=\"5902\"\u003e• Idle Power Consumption: 28W \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"1kmusxh\" data-start=\"5974\" data-end=\"5990\"\u003eConfiguration\u003c\/h2\u003e\n\u003cp data-start=\"5992\" data-end=\"6270\"\u003e• Amplifier Type: Multi-Channel Installation Power Amplifier\u003cbr data-start=\"6052\" data-end=\"6055\"\u003e• System Type: Commercial Distributed Audio Amplifier\u003cbr data-start=\"6108\" data-end=\"6111\"\u003e• Built-in DSP: HPF \/ LPF \/ Limiter Processing\u003cbr data-start=\"6157\" data-end=\"6160\"\u003e• Transformer: Integrated Hi-Z Operation Support\u003cbr data-start=\"6208\" data-end=\"6211\"\u003e• Mode: Low \u0026amp; High Impedance Professional Audio Operation\u003c\/p\u003e\n\u003ch2 data-section-id=\"ntyisd\" data-start=\"6272\" data-end=\"6283\"\u003eIncluded\u003c\/h2\u003e\n\u003cp data-start=\"6285\" data-end=\"6435\"\u003e• 1 × 4-Channel Power Amplifier\u003cbr data-start=\"6316\" data-end=\"6319\"\u003e• 1 × Mains Power Cable\u003cbr data-start=\"6342\" data-end=\"6345\"\u003e• 1 × Euroblock Connector Set\u003cbr data-start=\"6374\" data-end=\"6377\"\u003e• 1 × User Manual\u003c\/p\u003e","brand":"Quest","offers":[{"title":"Default Title","offer_id":52966294749503,"sku":"Quest QX4750","price":314800.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/5942\/1272\/files\/QX4750_01_1.webp?v=1778676949","url":"https:\/\/audiomaxx.in\/products\/quest-qx4750-professional-4-750w-class-d-2ru-installation-power-amplifier-with-auto-load-sensing-70v-100v-dante%e2%84%a2-expansion-support","provider":"Audiomaxx India","version":"1.0","type":"link"}