{"product_id":"audio-research-i-55-integrated-amplifier","title":"Audio Research I\/55 Integrated Amplifier","description":"\u003cdiv class=\"vc_custom_heading_wrap\"\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cdiv class=\"vc_custom_heading_wrap\"\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cdiv class=\"vc_custom_heading_wrap\"\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThe I\/55 takes advantages of new features and advancements from the I\/70 to create a worthy successor to the I\/50. \u003c\/p\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eI\/55 imports all the functionality of the I\/70 into a chassis that maintains the look and power output of the I\/50. \u003c\/p\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThe foundation is an all-tube amplification circuit using two matched sets of 6550 power tubes, fed by 6922 input tubes. The traditional combination of power and grace for which Audio Research is renowned is instantly recognisable even in this compact model. Challenge the I\/55 and be surpriosed by its depth of bass and dynamic expressio. Two LexieTubes provide display information for input selection and volume. \u003c\/p\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eChief among the improvements from I\/50 to I\/55 is the addition of auto-bias. This keeps the output tubes in their optimal operating range for the life of the tubes. \u003c\/p\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThe I\/55 integrated amp has independent tube preamplifier and tube amplifier sections, providing flexibility with a set of stereo preamplifier outputs. While we suspect very few listeners will pair it with an external power amp, many will need this feature to feed powered subwoofers that offer only low-level inputs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThe active preamplifier also offers a much wider range of gain setting compared to the passive preamp on board the I\/50. This is especially helpful with recordings that are cut at a low gain setting for wide dynamic range. Despite its identical power rating to the I\/50, the I\/55 will offer additional output due to both additional gain and higher headroom in its preamplifier section.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"vc_custom_heading_wrap\"\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-500 text-color-wvjs-color\"\u003eThe headphone output is driven by the 6550 output tubes. It was designed for high quality headphones, able to provide the best possible personal listening experience.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003e \u003c\/p\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThe DAC card’s AKM Velvet Sound DAC chip provides high resolution formats over USB, Optical, Coax, and Bluetooth. All are upsampled. The result is fine resolution, great transparency, and tonal purity that is rarely heard outside of the finest separate DACs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp class=\"clear\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"vc_custom_heading_wrap\"\u003e\n\u003cdiv class=\"heading-text el-text\"\u003e\n\u003cp class=\"font-156269 fontsize-594395 fontheight-140156 font-weight-300\"\u003eThere are three sets of single-ended inputs and one set of Balanced XLR inputs. The optional phono card has both MC and MM gain settings, controlled via the I\/55 remote.  MC loading is also adjustable, from 50 to 1k ohms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"font-156269 h6 font-weight-400 text-uppercase\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003ch2 class=\"font-156269 h6 font-weight-400 text-uppercase\"\u003e\u003cspan\u003eTECHNICAL SPECIFICATIONS\u003c\/span\u003e\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"empty-space empty-quart\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003cdiv class=\"wptb-root wptb-table-134381 wptb-style-isolation\" data-table-id=\"134381\" data-last-device=\"desktop\"\u003e\n\u003cdiv class=\"wptb-table-wrapper\" data-table-id=\"134381\"\u003e\n\u003cdiv class=\"wptb-table-container wptb-scroll-x\"\u003e\n\u003ctable class=\"wptb-table wptb-has-link-color\"\u003e\n\u003ccolgroup\u003e \u003ccol class=\"\"\u003e \u003ccol class=\"\"\u003e \u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"0\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003ePower Output\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"0\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e50 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% per channel, below 0.1% at 1 watt (Note that actual power output is dependent upon both line voltage and “condition” i.e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not critical)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"1\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003ePower Bandwidth\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"1\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e (-3dB points) 10Hz to 22kHz\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"2\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eFrequency Response\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"2\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e (-3dB points at 1 watt) 7Hz to 30kHz\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"3\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eInput Sensitivity\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"3\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e1.25V RMS for rated output\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"4\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eInput Impedance\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"4\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e100K ohms Balanced, 48K ohms Single Ended\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"5\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eOutput Polarity\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"5\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eNon-inverting. Balanced input pin 2+ (IEC-268)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"6\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eInputs\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"6\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e4 Inputs – 1 balanced, 3 single-ended\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"7\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eOutput Taps\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"7\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e8 ohms, 4 ohms\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"8\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003ePower Requirements\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"8\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e105-130VAC 60Hz (210-250VAC 50Hz) 252 watts at rated output\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"9\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eTube Required\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"9\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e2 matched pairs 6550WE; 3 x 6922 (1 input, 2 driver)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"wptb-row\"\u003e\n\u003ctd class=\"wptb-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"10\" data-col=\"0\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eDimensions\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"wptb-cell wptb-row-ending-cell\" colspan=\"1\" rowspan=\"1\" data-row=\"10\" data-col=\"1\"\u003e\n\u003cdiv class=\"wptb-cell-content\"\u003e\n\u003cdiv class=\"wptb-text-container\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eWidth 16.5” (42 cm)\u003c\/p\u003e\n\u003cp\u003eHeight 7.25” (18 cm)\u003c\/p\u003e\n\u003cp\u003eDepth 13.5” (34 cm)\u003c\/p\u003e\n\u003cp\u003eWeight: 40 lbs (18.1 kg); 51 lbs (23.1kg) shipping weight\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\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\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Audio Research","offers":[{"title":"Audio Research I\/55 - Black with Black \/ With Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034144588,"sku":"ARCI\/50BLKBLK","price":7415.0,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with Black \/ With Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034177356,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with Black \/ Without Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034210124,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with Black \/ Without Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034242892,"sku":null,"price":5748.33,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with White \/ With Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034275660,"sku":"ARCI\/50BLKWHT","price":7415.0,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with White \/ With Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034308428,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with White \/ Without Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034341196,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with White \/ Without Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034373964,"sku":null,"price":5748.33,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with Red \/ With Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034406732,"sku":"ARCI\/50BLKRED","price":7415.0,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Black with Red \/ With Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034439500,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - 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Silver with Silver \/ With Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034799948,"sku":"ARCI\/50SLVSLV","price":7415.0,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Silver with Silver \/ With Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034832716,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Silver with Silver \/ Without Phono Module \/ With Digital Module (Roon Ready)","offer_id":59648034865484,"sku":null,"price":6581.67,"currency_code":"GBP","in_stock":true},{"title":"Audio Research I\/55 - Silver with Silver \/ Without Phono Module \/ Without Digital Module (Roon Ready)","offer_id":59648034898252,"sku":null,"price":5748.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1053\/6891\/2204\/files\/I50-Red-front.jpg?v=1793366322","url":"https:\/\/www.stoneaudio.co.uk\/products\/audio-research-i-55-integrated-amplifier","provider":"Stone Audio","version":"1.0","type":"link"}