{"product_id":"radial-hdi-high-definition-studio-preamp","title":"Radial HDI High Definition Studio Preamp","description":"\u003ch2 class=\"intro-h2\"\u003eHigh Definition Studio Preamp\u003c\/h2\u003e\n\u003cdiv class=\"intro-p\"\u003e\n\u003cp\u003eThe HDI is a studio-quality preamp designed to create exceptional recordings with any instrument, utilizing premium Jensen transformers and a unique Color control that provides an entirely new yet familiar-sounding sonic palette to experiment with.\u003c\/p\u003e\n\u003ch2\u003eInstant Gratification\u003c\/h2\u003e\n\u003cp\u003eDespite the complex circuitry housed within the unit, the HDI has an elegant set of controls that allows the musician or engineer to dial up a record-ready sound with a minimal amount of tweaking required. The Level control drives the inputs of the HDI with instant visual feedback from the responsive front panel meter, while the Color knob provides seamless blending between an ultra-clean tone and amp-style distortion and saturation, so you can add just the right amount of character and grit to your instrument. A smooth Opto compressor can be engaged to control the peaks of the input signal, and a High-Pass Filter clears up any excessive low frequencies added by the Color control. Lastly, a Presence control accentuates the highs and high-mids, providing the ability to cut through the mix with results that are sure to impress.\u003c\/p\u003e\n\u003ch2\u003eLooks and Personality\u003c\/h2\u003e\n\u003cp\u003eWith its gunmetal anodized 1\/4\" thick milled front panel and distinctive styling reminiscent of classic outboard studio equipment, the HDI is sure to turn heads in any recording space. A custom output meter provides a level check at a glance, with oversized chrome knobs for precise adjustments and easy tweaking on-the-fly. The HDI is a stunning standalone unit, but it also comes complete with mounting hardware to install in standard 19\" equipment racks. One or two HDI's can be installed side-by-side in a 2RU rack space, and like all Radial products, they are built with rugged components and designed to easily withstand the rigors of concert touring.\u003c\/p\u003e\n\u003ctable class=\"table feature-product\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecifications\u003c\/th\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency response:\u003c\/td\u003e\n\u003ctd\u003eLine Output: 1Hz ~ 100kHz +0.25\/-3dB, 20Hz ~ 20kHz +\/-0.1dB Mic Output: 10Hz ~ 80kHz +0.25dB\/-3dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic range:\u003c\/td\u003e\n\u003ctd\u003e112dB (20-20k, unweighted, referred to +25dBu)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain:\u003c\/td\u003e\n\u003ctd\u003eMin Gain (Level CCW): -3dB Max Gain (Level CW): +31dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal harmonic distortion:\u003c\/td\u003e\n\u003ctd\u003e0.3% @20Hz, 0.22% @100Hz, 0.01% @1kHz (+4dBu In)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal to Noise:\u003c\/td\u003e\n\u003ctd\u003e91dB (20-20k, unweighted, referred to +4dBu)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input:\u003c\/td\u003e\n\u003ctd\u003e1\/4\" TS: +5dBu, 3 VAC RMS, 8.4 V Peak to Peak 3.5mm: +25dBu, 7 VAC RMS, 20V Peak to Peak (Level @ 12:00)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output:\u003c\/td\u003e\n\u003ctd\u003eLine Level XLR: +25dBu (1% THD at 1kHz) Mic Level XLR: +3.7dBu (1% THD at 1kHz) 1\/4\" Processed Out: +8dBu (Approx. unity gain with Level @ 12:00)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"heading\"\u003e\n\u003ctd colspan=\"2\"\u003eFeatures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\"\u003eGround lift, HPF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Connectors:\u003c\/td\u003e\n\u003ctd\u003e1\/4” TS (front and rear), 3.5mm Synth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Connectors:\u003c\/td\u003e\n\u003ctd\u003eXLR Line \/ Mic, 1\/4” TS Processed, 1\/4” TS Thru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtras:\u003c\/td\u003e\n\u003ctd\u003eOutput pad, Opto Compresser: 6:1 ratio, max 8dB gain reduction HPF: 40Hz \/ 100Hz rolloff @ -6dB\/octave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"heading\"\u003e\n\u003ctd colspan=\"3\"\u003eGeneral\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction:\u003c\/td\u003e\n\u003ctd\u003e14 gauge steel chassis, 1\/2” aluminum front panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize (L x W x D):\u003c\/td\u003e\n\u003ctd\u003e8.25” x 8.25” x 3.5”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight:\u003c\/td\u003e\n\u003ctd\u003e5.05lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower:\u003c\/td\u003e\n\u003ctd\u003e100-200VAC 0.45A ~ 50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConditions:\u003c\/td\u003e\n\u003ctd\u003eFor use in dry locations only between 5°C and 40°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty:\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\u003ca href=\"https:\/\/www.radialeng.com\/product\/hdi\/legal.php#Warranty\"\u003eRadial 3-year, transferable\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eBehind the Design\u003c\/h2\u003e\n\u003cp\u003eWhile the HDI is incredibly easy to use - requiring only a few seconds to achieve great-sounding results - both the design philosophy and the under-the-hood processes at work are anything but simple. Click here to read an interview with the HDI's designer, W.C. \"Hutch\" Hutchison for an in-depth look at how the HDI came to be and what makes its circuitry so unique.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Hear From Hutch Interview\" href=\"https:\/\/www.radialeng.com\/blog\/radial-hdi-direct-box\" target=\"_blank\"\u003eHear From Hutch\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Radial HDI Review By TapeOp Magazine\" href=\"https:\/\/www.radialeng.com\/wp-content\/uploads\/2021\/02\/TapeOP-HDI-Review-jan-feb.pdf\" target=\"_blank\"\u003eReview By TapeOp Magazine\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Radial HDI Smart Sheet\" href=\"https:\/\/www.radialeng.com\/wp-content\/uploads\/2025\/03\/Radial-SmartSheet-HDI-03-2025.pdf\" target=\"_blank\"\u003eSmart Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"Radial HDI User Guide\" href=\"https:\/\/www.radialeng.com\/wp-content\/uploads\/2020\/01\/HDI-owners-manual-v2.0-PRIN-07-2020.pdf\" target=\"_blank\"\u003eUser Guide\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.radialeng.com\/wp-content\/uploads\/2020\/05\/HDI-Rackmount-Manual_web.pdf\" target=\"_blank\" title=\"Radial HDI Rackmount Instructions\" rel=\"noopener\"\u003eRackmount Instructions\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Radial","offers":[{"title":"Default Title","offer_id":47957917237466,"sku":"R800 2025","price":849.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/9585\/9277\/files\/HDI-Front-1-1.jpg?v=1780767849","url":"https:\/\/www.rocketmusicshop.com\/products\/radial-hdi-high-definition-studio-preamp","provider":"RocketMusic","version":"1.0","type":"link"}