{"product_id":"ultrafide-u4pre-pre-amplifier-ex-demonstration","title":"Ultrafide U4PRE Pre-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-u4pre-tab-1:checked ~ .hb-tab-labels label[for=\"hb-ultrafide-u4pre-tab-1\"],\n  #hb-ultrafide-u4pre-tab-2:checked ~ .hb-tab-labels label[for=\"hb-ultrafide-u4pre-tab-2\"] {\n    background: #fff;\n    border-bottom: 2px solid rgba(0,0,0,0.65);\n  }\n\n  #hb-ultrafide-u4pre-tab-1:checked ~ .hb-panels #hb-ultrafide-u4pre-panel-1,\n  #hb-ultrafide-u4pre-tab-2:checked ~ .hb-panels #hb-ultrafide-u4pre-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-u4pre-tab-1\" name=\"hb-ultrafide-u4pre-tabs\" type=\"radio\"\u003e \u003cinput id=\"hb-ultrafide-u4pre-tab-2\" name=\"hb-ultrafide-u4pre-tabs\" type=\"radio\"\u003e\n\u003cdiv class=\"hb-tab-labels\"\u003e\n\u003clabel for=\"hb-ultrafide-u4pre-tab-1\"\u003eProduct Summary \u0026amp; Benefits\u003c\/label\u003e \u003clabel for=\"hb-ultrafide-u4pre-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-u4pre-panel-1\" class=\"hb-panel\"\u003e\n\u003ch3\u003eProduct Summary\u003c\/h3\u003e\n\u003cp\u003eThe Ultrafide U4PRE is a pure analogue pre-amplifier designed to act as the control centre of a serious hi-fi system. Part of Ultrafide’s Ultra Sigma series, it brings together flexible source management, a high-quality configurable phono stage, quad outputs and precision analogue volume control in a compact, beautifully engineered chassis.\u003c\/p\u003e\n\u003cp\u003eWith five stereo inputs and four stereo outputs, the U4PRE is ideal for systems that need more than a simple source selector. RCA and balanced XLR inputs allow it to work with a wide range of source components, while its parallel quad outputs give extra flexibility for bi-amping, multi-amplifier systems or more complex setups.\u003c\/p\u003e\n\u003cp\u003eThe built-in phono stage is highly configurable for both moving magnet and moving coil cartridges, with adjustable capacitance, resistance and gain. This makes the U4PRE especially useful for vinyl listeners who want a clean, low-noise analogue signal path without adding a separate phono stage.\u003c\/p\u003e\n\u003cp\u003eA discrete Class A\/B headphone amplifier is also built in, giving private listening the same level of attention as the main system outputs. With an OLED display, aluminium remote control and digital control over volume, balance, source naming and gain offset, the U4PRE combines analogue purity with everyday usability.\u003c\/p\u003e\n\u003cp\u003eThis is an ex-demo 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\u003eActs as a flexible analogue control centre for high-quality stereo systems\u003c\/li\u003e\n\u003cli\u003eFive stereo inputs allow multiple sources to be connected at once\u003c\/li\u003e\n\u003cli\u003eQuad parallel outputs are ideal for bi-amping, multi-amplifier systems and future system expansion\u003c\/li\u003e\n\u003cli\u003eConfigurable MM\/MC phono stage supports a wide range of turntables and cartridges\u003c\/li\u003e\n\u003cli\u003eClass A circuitry and a short signal path help preserve clarity, timing and musical detail\u003c\/li\u003e\n\u003cli\u003eDiscrete Class A\/B headphone amplifier provides high-quality private listening\u003c\/li\u003e\n\u003cli\u003eOLED display and aluminium remote make source selection, volume, balance, mute and standby easy to control\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and RCA connections make it suitable for both domestic hi-fi and professional-inspired systems\u003c\/li\u003e\n\u003cli\u003eDesigned as a natural partner for Ultrafide power amplifiers including the U500DC and SP500\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-u4pre-panel-2\" class=\"hb-panel\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePre-Amplifier Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType: Pure analogue pre-amplifier\u003c\/li\u003e\n\u003cli\u003eChannels: 2, left and right\u003c\/li\u003e\n\u003cli\u003eSeries: Ultrafide Ultra Sigma\u003c\/li\u003e\n\u003cli\u003eCircuit Design: Class A circuits with minimum signal path\u003c\/li\u003e\n\u003cli\u003eSignal Path: DC and super-low-frequency coupled systems\u003c\/li\u003e\n\u003cli\u003ePhono Stage: Configurable MM\/MC phono input with ultra-precise RIAA recovery stage\u003c\/li\u003e\n\u003cli\u003eHeadphone Amplifier: Discrete Class A\/B design\u003c\/li\u003e\n\u003cli\u003eDisplay: OLED screen\u003c\/li\u003e\n\u003cli\u003eRemote Control: Aluminium remote for standby, mute, source selection and volume\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAudio Inputs: 5 stereo inputs\u003c\/li\u003e\n\u003cli\u003eRCA Inputs: 3 stereo pairs, including phono input\u003c\/li\u003e\n\u003cli\u003eXLR Inputs: 2 stereo pairs balanced\u003c\/li\u003e\n\u003cli\u003eInput Impedance RCA: 47 kOhms\u003c\/li\u003e\n\u003cli\u003eInput Impedance XLR: 10 kOhms\u003c\/li\u003e\n\u003cli\u003eInput RFI Filtering Capacitance: 100 pF RCA, 500 pF XLR\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAudio Outputs: 4 stereo outputs\u003c\/li\u003e\n\u003cli\u003eRCA Outputs: 2 stereo pairs single-ended\u003c\/li\u003e\n\u003cli\u003eXLR Outputs: 2 stereo pairs balanced\u003c\/li\u003e\n\u003cli\u003eHeadphone Output: 1\/4 inch headphone jack\u003c\/li\u003e\n\u003cli\u003eLine Output Impedance: 75 Ohms\u003c\/li\u003e\n\u003cli\u003eHeadphone Output Impedance: 200 mOhms\u003c\/li\u003e\n\u003cli\u003eMaximum Line Output: 2.5 Vrms\u003c\/li\u003e\n\u003cli\u003eMaximum Headphone Output: 7 Vrms, 1.5 W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePhono Stage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCartridge Compatibility: Moving magnet and moving coil\u003c\/li\u003e\n\u003cli\u003ePhono Gain: +35 dB to +71 dB in 3 dB steps\u003c\/li\u003e\n\u003cli\u003ePhono Sensitivity: 0.16 mV to 5 mV for 316 mV output at 1 kHz\u003c\/li\u003e\n\u003cli\u003eAdjustable Resistance: 7 steps from 85 Ohms to 500 Ohms, plus 47 kOhms for moving magnet\u003c\/li\u003e\n\u003cli\u003eAdjustable Capacitance: 8 switch-selectable capacitance settings from 100 pF to 470 pF\u003c\/li\u003e\n\u003cli\u003ePhono Frequency Response: 20 Hz – 20 kHz, ±0.2 dB including RIAA\u003c\/li\u003e\n\u003cli\u003ePhono Johnson Noise: -146 dBu EIN, high gain, 0 Ohm source\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAudio Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLine Frequency Response: 5 Hz – 20 kHz, ±0.1 dB\u003c\/li\u003e\n\u003cli\u003eDynamic Range: 115 dB, unweighted, 22 Hz – 22 kHz\u003c\/li\u003e\n\u003cli\u003eDistortion: 0.003%\u003c\/li\u003e\n\u003cli\u003eLine Voltage Gain: 0 dB nominal\u003c\/li\u003e\n\u003cli\u003eHeadphone Voltage Gain: +10 dB nominal\u003c\/li\u003e\n\u003cli\u003eVolume Control Range: -95 dB to +10 dB in 1 dB steps, ±0.05 dB\u003c\/li\u003e\n\u003cli\u003eBalance Control: 0.5 dB step balance control with zero crossing detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePower \u0026amp; Control\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePower Supply Connector: 6 A IEC\u003c\/li\u003e\n\u003cli\u003eFuse: 1 A\u003c\/li\u003e\n\u003cli\u003eNominal Supply Voltage: 115 V AC 60 Hz or 230 V AC 50 Hz\u003c\/li\u003e\n\u003cli\u003ePower Consumption: 20 W operational, 1 W standby\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: Rear-panel connectors\u003c\/li\u003e\n\u003cli\u003eExpansion Port: 9-pin D-sub carrying DC power and balanced audio for future expansion products\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): 382 × 325 × 97 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 13.05 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 U4PRE pre-amplifier\u003c\/li\u003e\n\u003cli\u003eAluminium remote control\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":58142107566467,"sku":null,"price":3500.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0160\/4606\/3670\/files\/Untitled_3500x3500px_-2026-05-09T102328.089.png?v=1778318790","url":"https:\/\/www.holburnonline.co.uk\/products\/ultrafide-u4pre-pre-amplifier-ex-demonstration","provider":"Holburn Online","version":"1.0","type":"link"}