{"id":175,"date":"2016-08-23T17:38:41","date_gmt":"2016-08-23T17:38:41","guid":{"rendered":"http:\/\/blogs.qsc.com\/systems\/?p=175"},"modified":"2022-07-13T06:48:29","modified_gmt":"2022-07-13T13:48:29","slug":"fast-flexible-amplifier-summing-technology","status":"publish","type":"post","link":"https:\/\/blogs.qsc.com\/systems\/fr\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/","title":{"rendered":"FAST (Flexible Amplifier Summing Technology)"},"content":{"rendered":"<p>Every so often a new technology paradigm comes along that causes you to forget everything you know, and eventually changes the way you specify or design systems.<\/p>\n<p>A few years ago, QSC introduced a new platform of four-channel DSP power amplifiers, available in three flavors &#8211; <span style=\"color: #0055ff\"><a style=\"color: #0055ff\" href=\"http:\/\/www.qsys.com\/live-sound\/products\/power-amplifiers\/pld-series\/?utm_source=Blog&amp;utm_medium=Blog%20Post&amp;utm_content=PLD%20Series&amp;utm_campaign=FAST%20Blog%20-%20PLD%20Series\">PLD Series <\/a><\/span>for live sound, <span style=\"color: #0055ff\"><a style=\"color: #0055ff\" href=\"http:\/\/www.qsys.com\/systems\/products\/power-amplifiers\/dsp-amplifiers-usb\/cxd-series\/?utm_source=Blog&amp;utm_medium=Blog%20post&amp;utm_content=CXD%20Series&amp;utm_campaign=FAST%20Blog%20-%20CXD%20Series\">CXD Series <\/a><\/span>for install sound, and <span style=\"color: #0055ff\"><a style=\"color: #0055ff\" href=\"http:\/\/www.qsys.com\/cinema\/products\/power-amplifiers\/dpa-series\/?utm_source=Blog&amp;utm_medium=Blog%20Post&amp;utm_content=DPA%20Series&amp;utm_campaign=FAST%20Blog%20-%20DPA%20Series\">DPA Series<\/a><\/span> for cinema sound. They offer:<\/p>\n<ul>\n<li>4<sup>th<\/sup> generation PowerLight switching power supply<\/li>\n<li>Power Factor Correction (PFC)<\/li>\n<li>Built-in DSP for loudspeaker processing<\/li>\n<li>QSC\u2019s third generation Class-D topology<\/li>\n<li>Most importantly, a unique technology that we proudly refer to as <strong>FAST (Flexible Amplifier Summing Technology\u2122). <\/strong>FAST is one of those monumental paradigm shifts for amplifier bridging that hit the big reset switch on industry thinking.<\/li>\n<\/ul>\n<h4>Understanding FAST Requires&nbsp;Understanding Ohms Law<\/h4>\n<p>Power (in watts) equals voltage squared divided by resistance (or in this case the loudspeaker\u2019s impedance which changes with frequency and temperature).&nbsp; Traditional amplifiers have always been designed by manipulating the current and voltage limits to provide highest power at 2 ohms without bridging. This allows the manufacturer to boast a high power rating at 2 ohms.<\/p>\n<p><a href=\"http:\/\/blogs.qsc.com\/systems\/fr\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single.png\/\" rel=\"attachment wp-att-176\"><img decoding=\"async\" class=\"wp-image-176 alignnone\" src=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single.png\" alt=\"FAST-Channel-Graph_single\" width=\"765\" height=\"312\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single.png 1500w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-300x122.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-768x313.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-1024x418.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-250x102.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-550x224.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-800x326.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-441x180.png 441w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-735x300.png 735w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single-1225x500.png 1225w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/a><\/p>\n<p>When bridging the amplifier, you are effectively doubling the voltage; however, the current limit remains the same. Because the most current is required at lower impedances, where heat is a real concern, doubling voltage only really benefits the user when using a 4 ohm load or higher.&nbsp; This is why you never see a 2 ohm bridged rating on a spec sheet.<\/p>\n<p><a href=\"http:\/\/blogs.qsc.com\/systems\/fr\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged.png\/\" rel=\"attachment wp-att-177\"><img decoding=\"async\" class=\"wp-image-177 alignleft\" src=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged.png\" alt=\"FAST-Channel-Graph_bridged\" width=\"738\" height=\"301\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged.png 1500w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-300x122.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-768x313.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-1024x418.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-250x102.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-550x224.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-800x326.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-441x180.png 441w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-735x300.png 735w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_bridged-1225x500.png 1225w\" sizes=\"(max-width: 738px) 100vw, 738px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>QSC\u2019s new generation of FAST amplifier offer both types \u2013 \u201cCountry and Western\u201d, ooops, I mean \u201cBridge and Parallel\u201d.&nbsp;Unlike traditional amplifiers which are designed to deliver the highest single channel power at 2 ohms, these FAST amplifiers are designed to deliver the highest single channel power at 6 ohms (halfway between 4 and 8 ohms). This allows the amplifier to operate in both Bridge and Parallel modes.<\/p>\n<h4>So What is the Difference Between Bridge and Parallel?<\/h4>\n<p><a href=\"http:\/\/blogs.qsc.com\/systems\/fr\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1.png\/\" rel=\"attachment wp-att-178\"><img decoding=\"async\" class=\"alignright wp-image-178\" src=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1.png\" alt=\"battery_diagram1\" width=\"379\" height=\"180\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1.png 1920w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-300x143.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-768x365.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-1024x487.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-250x119.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-550x262.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-800x380.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-379x180.png 379w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-631x300.png 631w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/battery_diagram1-1051x500.png 1051w\" sizes=\"(max-width: 379px) 100vw, 379px\" \/><\/a>The best way to understand the difference is to use an AA battery analogy. When two batteries are wired end-to-end and connected to a lightbulb they are now in series (2x the voltage) and as a result the lightbulb will glow brighter. This is the equivalent of bridging&nbsp;a traditional power amplifier. When the same 2x batteries are wired side by side, they are now in parallel (2x the current), and although the bulb will not glow brighter, you can now connect more bulbs to the circuit. This is the equivalent of paralleling amplifier channels, &nbsp;because at low impedances there is already plenty of voltage available, having more current is what actually gives you higher power to drive more loudspeakers on the circuit.<\/p>\n<p>Using FAST, bridging two channels will give you greater power optimized for higher impedances (8-16 ohms). HOWEVER, paralleling two channels will give you greater power optimized for lower impedances (2-4 ohms).<\/p>\n<p><a href=\"http:\/\/blogs.qsc.com\/systems\/fr\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2.jpg\/\" rel=\"attachment wp-att-216\"><img decoding=\"async\" class=\"alignnone wp-image-216\" src=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2.jpg\" alt=\"FAST-parallel2\" width=\"500\" height=\"314\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2.jpg 900w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-300x188.jpg 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-768x482.jpg 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-250x157.jpg 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-550x345.jpg 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-800x502.jpg 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-287x180.jpg 287w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-478x300.jpg 478w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel2-796x500.jpg 796w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>And that\u2019s not all, FAST amplifiers also offer the ability to combine three (or even four) channels into parallel mode to achieve ridiculously high current at low impedances (1-2 ohms).&nbsp; And for that super mono-block, you can even bridge-parallel all four channels to achieve 8000 watts of dynamic power optimized for a 4-8 ohm load.<\/p>\n<p><a href=\"http:\/\/blogs.qsc.com\/systems\/fr\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2.jpg\/\" rel=\"attachment wp-att-215\"><img decoding=\"async\" class=\"alignnone wp-image-215\" src=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2.jpg\" alt=\"FAST-parallel-burst2\" width=\"500\" height=\"387\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2.jpg 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-300x232.jpg 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-768x594.jpg 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-250x193.jpg 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-550x426.jpg 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-233x180.jpg 233w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-388x300.jpg 388w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-parallel-burst2-646x500.jpg 646w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>So this begs the question, if parallel mode offers greater power compared to bridge mode at these lower impedances, then why doesn\u2019t everyone do it?&nbsp; The answer is quite simple \u2013 it\u2019s really hard to design! That\u2019s why QSC has the best engineers in the industry \u2013 they actually figured it out!<\/p>\n<h4 style=\"text-align: center\">Flexible Amplifier Summing Technology.&nbsp; It\u2019s pretty cool stuff!<\/h4>","protected":false},"excerpt":{"rendered":"<p>Every so often a new technology paradigm comes along that causes you to forget everything you know, and eventually changes the way you specify or design systems. A few years ago, QSC introduced a new platform of four-channel DSP power amplifiers, available in three flavors &#8211; PLD Series for live sound, CXD Series for install &hellip; <a href=\"https:\/\/blogs.qsc.com\/systems\/fr\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/\">Read More<\/a><\/p>","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FAST (Flexible Amplifier Summing Technology) - Q-SYS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.qsc.com\/systems\/fr\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FAST (Flexible Amplifier Summing Technology) - Q-SYS\" \/>\n<meta property=\"og:description\" content=\"Every so often a new technology paradigm comes along that causes you to forget everything you know, and eventually changes the way you specify or design systems. A few years ago, QSC introduced a new platform of four-channel DSP power amplifiers, available in three flavors &#8211; PLD Series for live sound, CXD Series for install &hellip; Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.qsc.com\/systems\/fr\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/\" \/>\n<meta property=\"og:site_name\" content=\"Q-SYS\" \/>\n<meta property=\"article:published_time\" content=\"2016-08-23T17:38:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-07-13T13:48:29+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2016\/08\/FAST-Channel-Graph_single.png\" \/>\n<meta name=\"author\" content=\"David Fuller\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"David Fuller\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.qsc.com\/systems\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/\",\"url\":\"https:\/\/blogs.qsc.com\/systems\/2016\/08\/23\/fast-flexible-amplifier-summing-technology\/\",\"name\":\"FAST (Flexible Amplifier Summing Technology) - 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