{"product_id":"ultrafide-sp500-power-amplifier-ex-demonstration","title":"Ultrafide SP500 Power Amplifier - Ex-Demonstration","description":"\u003cstyle\u003e\n  .hb-tabs { margin: 18px 0; border: 1px solid rgba(0,0,0,0.12); border-radius: 10px; overflow: hidden; }\n  .hb-tabs input { display: none; }\n  .hb-tab-labels { display: flex; gap: 0; border-bottom: 1px solid rgba(0,0,0,0.12); background: rgba(0,0,0,0.03); }\n  .hb-tab-labels label {\n    flex: 1;\n    padding: 12px 14px;\n    cursor: pointer;\n    font-weight: 600;\n    text-align: center;\n    user-select: none;\n  }\n  .hb-panels { padding: 14px 16px; background: #fff; }\n  .hb-panel { display: none; }\n\n  #hb-ultrafide-sp500-tab-1:checked ~ .hb-tab-labels label[for=\"hb-ultrafide-sp500-tab-1\"],\n  #hb-ultrafide-sp500-tab-2:checked ~ .hb-tab-labels label[for=\"hb-ultrafide-sp500-tab-2\"] {\n    background: #fff;\n    border-bottom: 2px solid rgba(0,0,0,0.65);\n  }\n\n  #hb-ultrafide-sp500-tab-1:checked ~ .hb-panels #hb-ultrafide-sp500-panel-1,\n  #hb-ultrafide-sp500-tab-2:checked ~ .hb-panels #hb-ultrafide-sp500-panel-2 {\n    display: block;\n  }\n\n  .hb-panels h3 { margin: 18px 0 12px; font-size: 1.05em; }\n  .hb-panels p { margin: 20px 0 6px; }\n  .hb-panels ul { margin: 8px 0 20px 18px; }\n\u003c\/style\u003e\n\u003cdiv class=\"hb-tabs\"\u003e\n\u003cinput checked id=\"hb-ultrafide-sp500-tab-1\" name=\"hb-ultrafide-sp500-tabs\" type=\"radio\"\u003e \u003cinput id=\"hb-ultrafide-sp500-tab-2\" name=\"hb-ultrafide-sp500-tabs\" type=\"radio\"\u003e\n\u003cdiv class=\"hb-tab-labels\"\u003e\n\u003clabel for=\"hb-ultrafide-sp500-tab-1\"\u003eProduct Summary \u0026amp; Benefits\u003c\/label\u003e \u003clabel for=\"hb-ultrafide-sp500-tab-2\"\u003eTech Specs \u0026amp; Box Contents\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb-panels\"\u003e\n\u003cdiv id=\"hb-ultrafide-sp500-panel-1\" class=\"hb-panel\"\u003e\n\u003ch3\u003eProduct Summary\u003c\/h3\u003e\n\u003cp\u003eThe Ultrafide SP500 is a high-performance stereo power amplifier designed to bring Ultrafide’s professional audio heritage into a sleek, more compact hi-fi form. Short for squaredPOWER, the SP500 uses minimalist square casework that fits neatly into a wider range of systems, while retaining the powerful Ultra Sigma amplifier technology first introduced in the flagship U500DC.\u003c\/p\u003e\n\u003cp\u003eDelivering 500 W per channel into 4 Ohms and 250 W per channel into 8 Ohms, the SP500 has the drive and control needed to partner a wide variety of loudspeakers with confidence. Its Ultra Sigma Class D output topology is supported by a robust 500 VA linear power supply, helping the amplifier deliver scale, grip and dynamic stability without adding unnecessary bulk.\u003c\/p\u003e\n\u003cp\u003eThe SP500 is fully DC coupled from input to output, supporting clean, accurate signal transmission and fast transient response. Balanced XLR and RCA inputs are both included, with XLR link outputs and multiple speaker connection options giving useful flexibility for hi-fi, studio and custom installation systems.\u003c\/p\u003e\n\u003cp\u003eWith its Pure Timbre sonic signature, professional-grade engineering and elegant compact chassis, the SP500 is an excellent choice for listeners who want serious amplifier power, low distortion and refined musical performance in a more understated design.\u003c\/p\u003e\n\u003cp\u003eThis is an ex-demonstration model that has been very well cared for. It comes supplied with original boxing and accessories.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDelivers powerful speaker control with 500 W per channel into 4 Ohms and 250 W per channel into 8 Ohms\u003c\/li\u003e\n\u003cli\u003eUltra Sigma Class D topology offers high power, low distortion and excellent efficiency\u003c\/li\u003e\n\u003cli\u003e500 VA linear power supply helps maintain strong, stable performance during demanding music passages\u003c\/li\u003e\n\u003cli\u003eFully DC-coupled signal path supports fast, clean and accurate audio transmission\u003c\/li\u003e\n\u003cli\u003ePure Timbre sonic signature is designed for a clear, engaging and natural presentation\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and RCA inputs make it easy to integrate with a wide range of pre-amplifiers\u003c\/li\u003e\n\u003cli\u003eXLR link outputs, binding posts and speakON connections provide useful system flexibility\u003c\/li\u003e\n\u003cli\u003eCompact square casework fits neatly into mixed hi-fi systems and custom installations\u003c\/li\u003e\n\u003cli\u003eRack mounting kit available for studio and custom installation use\u003c\/li\u003e\n\u003cli\u003e5 years manufacturer's warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"hb-ultrafide-sp500-panel-2\" class=\"hb-panel\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAmplifier Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType: Stereo power amplifier\u003c\/li\u003e\n\u003cli\u003eChannels: 2\u003c\/li\u003e\n\u003cli\u003eDesign Topology: Ultrafide Ultra Sigma Class D topology with Sigma-Delta modulation\u003c\/li\u003e\n\u003cli\u003eInter-stage Coupling: Fully DC coupled\u003c\/li\u003e\n\u003cli\u003ePower Supply: 500 VA linear power supply\u003c\/li\u003e\n\u003cli\u003eSound Signature: Pure Timbre\u003c\/li\u003e\n\u003cli\u003eRack Mounting: Optional rack mounting kit available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRMS Power into 4 Ohms: 500 W per channel, 600 W at high gain setting\u003c\/li\u003e\n\u003cli\u003eRMS Power into 6 Ohms: 333 W per channel, 400 W at high gain setting\u003c\/li\u003e\n\u003cli\u003eRMS Power into 8 Ohms: 250 W per channel, 300 W at high gain setting\u003c\/li\u003e\n\u003cli\u003eRMS Power into 12 Ohms: 166 W per channel, 200 W at high gain setting\u003c\/li\u003e\n\u003cli\u003eMaximum Voltage: 70 V\u003c\/li\u003e\n\u003cli\u003eMaximum Current: 30 A, pulsed testing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAudio Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFrequency Response: 5 Hz – 20 kHz, ±0.3 dB\u003c\/li\u003e\n\u003cli\u003eDistortion: 0.003% at 5 W\u003c\/li\u003e\n\u003cli\u003eDynamic Range: 115 dB, unweighted, 22 Hz – 22 kHz\u003c\/li\u003e\n\u003cli\u003eOutput Impedance: 25 mOhms\u003c\/li\u003e\n\u003cli\u003eInput Impedance: 10 kOhms, RCA and XLR\u003c\/li\u003e\n\u003cli\u003eInput RFI Filtering Capacitance: 550 pF, RCA and XLR\u003c\/li\u003e\n\u003cli\u003eSensitivity: 2.2 V\u003c\/li\u003e\n\u003cli\u003eVoltage Gain: 26 dB standard factory setting, 29 dB optional high gain setting\u003c\/li\u003e\n\u003cli\u003eStability: Unconditional\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eConnections \u0026amp; Controls\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAudio Inputs: 2 × RCA single-ended and 2 × XLR balanced\u003c\/li\u003e\n\u003cli\u003eAudio Outputs: Binding posts, NL4 speakON and XLR link outputs\u003c\/li\u003e\n\u003cli\u003eSpeaker Outputs: 3 pairs, including 2 × binding post and 2 × NL4 speakON\u003c\/li\u003e\n\u003cli\u003ePower Supply Connector: 10 A Furutech C13 IEC\u003c\/li\u003e\n\u003cli\u003ePower Isolation Switch: Rear panel\u003c\/li\u003e\n\u003cli\u003eStandby Switch: Front panel\u003c\/li\u003e\n\u003cli\u003eRemote Standby Connector: Rear panel\u003c\/li\u003e\n\u003cli\u003ePower Indicator: White for out of standby; red LED for clipping or protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOperational Power Consumption: 200 W average, 1000 W maximum\u003c\/li\u003e\n\u003cli\u003eIdle Power Consumption: 15 W\u003c\/li\u003e\n\u003cli\u003eStandby Power Consumption: 1 W\u003c\/li\u003e\n\u003cli\u003eNominal Supply Voltage: 230 V AC 50 Hz or 120 V AC 60 Hz\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions (L × W × H): 318 × 355 × 90 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 12.5 kg\u003c\/li\u003e\n\u003cli\u003ePacked Dimensions (L × W × H): 590 × 405 × 152 mm\u003c\/li\u003e\n\u003cli\u003ePacked Weight: 14.65 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUltrafide SP500 stereo power amplifier\u003c\/li\u003e\n\u003cli\u003eMains power cable\u003c\/li\u003e\n\u003cli\u003eProduct documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Ultrafide","offers":[{"title":"Default Title","offer_id":58142058414467,"sku":null,"price":2990.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0160\/4606\/3670\/files\/Untitled_3500x3500px_-2026-05-09T101932.194.png?v=1778318622","url":"https:\/\/www.holburnonline.co.uk\/products\/ultrafide-sp500-power-amplifier-ex-demonstration","provider":"Holburn Online","version":"1.0","type":"link"}