{"product_id":"allnic-audio-rd-7500-otl-ocl-dac","title":"Allnic Audio RD-7500 OTL\/OCL DAC","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesign Goal:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eMinimization of Distortion (Straight Wire with Gain)\u003c\/p\u003e\n\u003cp\u003eThe “Straight Wire with Gain”—the North Star of audio design—is the goal of delivering an input signal with zero modulation or processing, increasing only its magnitude with absolute precision.\u003c\/p\u003e\n\u003cp\u003eUnlike general amplifiers that amplify power, a DAC is a device that converts delicate digital signals into analog and transmits them to the next stage. Therefore, “precision” and “signal purity” are the highest priorities. To achieve this, the RD-7500 eliminates all interference that obstructs the signal flow throughout the entire digital and analog process.\u003c\/p\u003e\n\u003cdiv class=\"fusion-text\"\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eDigital Part: The World’s Most Precise DAC Chip (ESS ES9039PRO)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003ePrecise analog transmission begins with perfect digital reconstruction. The RD-7500 is equipped with the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eES9039PRO\u003c\/strong\u003e, the flagship chip from ESS Technology, widely regarded as the finest DAC chip in existence.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHyperStream IV Architecture:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUtilizing 4th-generation technology, it undergoes a conversion process far more sophisticated than previous generations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-High Resolution Data Processing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBased on a 32-bit, 8-channel architecture, it achieves overwhelming Dynamic Range (DNR) and extreme Total Harmonic Distortion (THD+N). It perfectly restores even the micro-details hidden within digital sources.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003col start=\"2\"\u003e\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fusion-sep-clear\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"fusion-separator fusion-full-width-sep sep-none\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"table-1\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003col start=\"2\"\u003e\n\u003cli\u003e\u003cstrong\u003eMethodology 1: Non-Feedback (Zero Negative Feedback)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eWhile Negative Feedback (NFB) is an engineering “correction tool” used to adjust measured figures, \u003cstrong\u003eNon-Feedback\u003c\/strong\u003e is an “artistic frontal assault” that maximizes the inherent purity of the components.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"table-1\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003e\u003cstrong\u003eNegative Feedback (NFB)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003e\u003cstrong\u003eNon-Feedback (Allnic)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDesign Philosophy\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003eCompares output to input to correct errors\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eAmplifies the input signal exactly as it is\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDistortion (THD)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003eLowers distortion figures artificially\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eResolved through the component’s own linearity\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eResponse Speed\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003eMicro-delays occur due to loop latency\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eInstantaneous response without delay (Transient)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePhase Characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003ePossible phase distortion in high frequencies\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eExtremely stable phase across all bandwidths\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003eForcibly lowered through feedback\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eDetermined solely by the component’s low internal resistance\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSonic Character\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003ePrecise but can be somewhat flat\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eVividness, vast openness, and natural harmonics\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDesign Difficulty\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"206\"\u003e\n\u003cp\u003eRelatively easy due to corrective circuitry\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"249\"\u003e\n\u003cp\u003eExtremely difficult; the circuit itself must be perfect\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fusion-text\"\u003e\n\u003cdiv\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/div\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003col start=\"2\"\u003e\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fusion-text\"\u003e\n\u003cp\u003e\u003cstrong\u003eThe Essential Difference:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIf feedback is a method of “fixing a mistake after it happens,” Allnic’s Non-Feedback is a method of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e“ensuring no mistake happens from the very beginning.”\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis design is made possible by the overwhelming linearity of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5687 vacuum tube\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003col start=\"3\"\u003e\n\u003cli\u003e\u003cstrong\u003eMethodology 2: OTL\/OCL (Output Transformer-Less \/ Output Capacitor-Less)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThrough its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOTL\/OCL\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edesign, the RD-7500 completely removes the physical signal barriers of output transformers and coupling capacitors. This realizes true broadband transmission—from DC to ultra-high frequencies far exceeding the audible range—without phase distortion or information loss.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemoval of Transformer (L):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBy fundamentally blocking leakage inductance and distributed capacitance that degrade high-frequency resolution, it secures a crystal-clear high end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemoval of Capacitor (C):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBy breaking down the reactance (XC) barrier that blocks low frequencies, it eliminates low-end phase shift. The result is an extremely elastic and fast bass response.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003col start=\"4\"\u003e\n\u003cli\u003e\u003cstrong\u003eMethodology 3: Single-Stage 5687 Vacuum Tube Amplification\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIn a DAC, signal purity is more important than excessive amplification. For this reason, the RD-7500 insists on a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSingle-Stage 5687 amplification\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecircuit.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRealization of the Shortest Path:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUnlike IC\/TR circuits or multi-stage amplification circuits that pass through dozens of components, the RD-7500 prevents signal contamination at the source through a single stage of amplification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Power of Direct Drive:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 5687 tube features very low internal resistance and high transconductance. This allows it to secure sufficient gain and low output impedance simultaneously with just one stage, driving the connected amplifier with powerful authority.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003col start=\"5\"\u003e\n\u003cli\u003e\u003cstrong\u003eConclusion: An Unprecedented Design Solving Technical Challenges Simultaneously\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThe RD-7500 is an uncompromising reference for audiophiles worldwide.\u003c\/p\u003e\n\u003cp\u003eCombining the world’s best chip, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eES9039PRO\u003c\/strong\u003e, with Allnic’s proprietary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSingle-Stage, Non-Feedback, and OTL\/OCL technologies\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003einto a single circuit is a high-level engineering achievement—designed to reach the pinnacle of digital precision and analog purity at the same time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-1\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eItem\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Inputs\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eInput Terminals\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eOne (1) USB, One (1) Optical, One (1) AES\/EBU, One (1) Coaxial\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBluetooth\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eBluetooth 5.1 (aptX, aptX-LL, aptX-HD, aptX Adaptive)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDAC Chip\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eOne (1) ES9039PRO (32-bit HyperStream IV Architecture)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSample Rates\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003ePCM: 44.1kHz – 384kHz \/ DSD: DSD64 – DSD512\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDoP \/ S\/PDIF\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eDoP: up to DoP512 \/ S\/PDIF: up to 192kHz\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eDNR: +132dB \/ THD+N: −122dB \/ Output: Balanced 2Vrms\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSupported OS\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eUSB Input\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eWindows (7, 8, 10\/11), Mac (OSX 10.6+), Linux (UAC2 compliant)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eAnalog Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCircuit Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eFull OTL\/OCL (Output Transformer-Less \/ Output Capacitor-Less)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eVacuum Tubes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e5687 x 2\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eGain \/ Impedance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eGain: +5dB \/ Output Impedance: 500Ω\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eS\/N Ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e-110dB\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical \u0026amp; Control\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFront Panel\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eButtons \u0026amp; LEDs (USB, Optical, AES\/EBU, COAX, BT, Ext. Clock)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions (W×D×H)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e35.5cm x 44.5cm x 14.0cm (14 x 17.5 x 5.5 inches)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Allnic","offers":[{"title":"Sort","offer_id":57819104608587,"sku":null,"price":64900.0,"currency_code":"DKK","in_stock":true},{"title":"Sølv","offer_id":57819104641355,"sku":null,"price":64900.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/7991\/2779\/files\/rd01.jpg?v=1783692107","url":"https:\/\/sallingboeaudio.com\/products\/allnic-audio-rd-7500-otl-ocl-dac","provider":"Sallingboe Audio","version":"1.0","type":"link"}