{"id":2179,"date":"2021-09-07T15:15:03","date_gmt":"2021-09-07T22:15:03","guid":{"rendered":"https:\/\/blogs.qsc.com\/systems\/?p=2179"},"modified":"2022-07-13T06:19:59","modified_gmt":"2022-07-13T13:19:59","slug":"what-about-long-term-amplifier-power-output-consultant-courier","status":"publish","type":"post","link":"https:\/\/blogs.qsc.com\/systems\/es\/2021\/09\/07\/what-about-long-term-amplifier-power-output-consultant-courier\/","title":{"rendered":"What About Long-Term Amplifier Power Output? (Consultant Courier)"},"content":{"rendered":"<div class=\"trp_language_switcher_shortcode\">\n<div class=\"trp-language-switcher trp-language-switcher-container\" data-no-translation>\n    <div class=\"trp-ls-shortcode-current-language\">\n        <a href=\"#\" class=\"trp-ls-shortcode-disabled-language trp-ls-disabled-language\" title=\"Espa\u00f1ol\" onclick=\"event.preventDefault()\">\n\t\t\t Espa\u00f1ol\t\t<\/a>\n    <\/div>\n    <div class=\"trp-ls-shortcode-language\">\n                <a href=\"#\" class=\"trp-ls-shortcode-disabled-language trp-ls-disabled-language\"  title=\"Espa\u00f1ol\" onclick=\"event.preventDefault()\">\n\t\t\t Espa\u00f1ol\t\t<\/a>\n                    <a href=\"https:\/\/blogs.qsc.com\/systems\/es\/wp-json\/wp\/v2\/posts\/2179\" title=\"English\">\n             English        <\/a>\n\n            <a href=\"https:\/\/blogs.qsc.com\/systems\/es\/wp-json\/wp\/v2\/posts\/2179\" title=\"Deutsch\">\n             Deutsch        <\/a>\n\n            <a href=\"https:\/\/blogs.qsc.com\/systems\/es\/wp-json\/wp\/v2\/posts\/2179\" title=\"Fran\u00e7ais\">\n             Fran\u00e7ais        <\/a>\n\n            <a href=\"https:\/\/blogs.qsc.com\/systems\/es\/wp-json\/wp\/v2\/posts\/2179\" title=\"English (UK)\">\n             English (UK)        <\/a>\n\n        <\/div>\n    <script type=\"application\/javascript\">\n        \/\/ need to have the same with set from JS on both divs. Otherwise it can push stuff around in HTML\n        var trp_ls_shortcodes = document.querySelectorAll('.trp_language_switcher_shortcode .trp-language-switcher');\n        if ( trp_ls_shortcodes.length > 0) {\n            \/\/ get the last language switcher added\n            var trp_el = trp_ls_shortcodes[trp_ls_shortcodes.length - 1];\n\n            var trp_shortcode_language_item = trp_el.querySelector( '.trp-ls-shortcode-language' )\n            \/\/ set width\n            var trp_ls_shortcode_width                                               = trp_shortcode_language_item.offsetWidth + 16;\n            trp_shortcode_language_item.style.width                                  = trp_ls_shortcode_width + 'px';\n            trp_el.querySelector( '.trp-ls-shortcode-current-language' ).style.width = trp_ls_shortcode_width + 'px';\n\n            \/\/ We're putting this on display: none after we have its width.\n            trp_shortcode_language_item.style.display = 'none';\n        }\n    <\/script>\n<\/div>\n<\/div>\n<p>Like most audio equipment, power amplifiers have a lot of specs associated with them, all of which can help us understand the performance and reliability of an amplifier. No single specification ever tells the whole story, which is why it\u2019s important to dig deeper to determine an amplifier\u2019s \u201cfit\u201d for the job.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Max Power<\/strong><\/h3>\n\n\n\n<p>Most manufacturers, including QSC, specify both the maximum (also called \u201cinstantaneous\u201d or \u201cburst\u201d) power capability and the continuous power capability of their amplifiers.&nbsp;The \u201cmax power\u201d spec for QSC amplifiers is measured with:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>a single amplifier channel driven<\/li><li>the rated low or high impedance load on the driven channel<\/li><li>a 20 ms sine wave burst at 1 kHz<\/li><li>the amplifier output just below clipping<\/li><\/ul>\n\n\n\n<p>While no amplifier can sustain this power output for an extended period of time, the \u201cmax power\u201d gives a good indication of how an amplifier performs on transient peaks.&nbsp;Since the burst is very short, max power is typically limited by one (or more) of these amplifier parameters: the amplifier\u2019s voltage rails, its power supply capacitance or its output stage current limit. Thermal limitations don\u2019t generally come into play with maximum power specifications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Long-Term Power<\/strong><\/h3>\n\n\n\n<p>However, thermal management capabilities begin to dominate amplifier power specifications in <em>long-term<\/em> power delivery.&nbsp;\u201cLong-term\u201d in this context means continuous operation until thermal equilibrium is reached \u2013 i.e., the amplifier is no longer decreasing its output power to maintain a safe operating temperature.&nbsp;The \u201cContinuous Power\u201d spec for QSC amplifiers is measured with:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>all amplifier channels driven<\/li><li>the rated low or high impedance load on all channels<\/li><li>a continuous sine wave input to all channels<\/li><li>the power output on all channel set to the continuous power spec level<\/li><\/ul>\n\n\n\n<p>The performance of the amplifier during this test indicates how it will fare delivering significant power day in, day out\u2026. for years. It\u2019s important that an amplifier not shut down or otherwise lose audio during this testing, but rather manage its output power to continue to operate both safely and without interruption. In doing so, the amplifier also safely limits its internal temperature rise.&nbsp;Since heat is the number one enemy of robust long-term operation of any electronic device, comprehensive thermal management is the key to long amplifier service life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Steps to Maximize Lifespan<\/strong><\/h3>\n\n\n\n<p>There are two key steps to take when installing amplifiers that maximize the useful life without adding cost. The first is proper ventilation: clean, low-humidity and unobstructed air is critical for cooling an amplifier. Providing an accurate heat load estimate to the venue\u2019s mechanical designers will insure adequate HVAC performance in the rack room without costly overdesign.&nbsp;Second, and just as important as proper ventilation, is powering the amplifiers with the highest AC input voltage (up to the amplifier\u2019s 240 VAC limit) available in the venue. For any given amplifier power output, higher AC input voltage means lower AC input current. This will ease the overall burden on the venue\u2019s power infrastructure.&nbsp;In addition, the amplifier\u2019s power supply is more efficient at higher voltages, so heat dissipation is substantially less.<\/p>\n\n\n\n<p>Below is a graph of AC mains current versus power output at three common AC input voltages.&nbsp;Note that the AC input current at 120 VAC exceeds 30 A at around 2500 W total output power.&nbsp;Compare that with 230 VAC, where the total power output is a little less than 5500 W before the AC input current exceeds 30 A. It\u2019s clear that higher AC input voltage not only maximizes amplifier efficiency, but also reduces instantaneous AC voltage drops on the mains that further limit maximum output power.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/blogs.qsc.com\/systems\/es\/app\/uploads\/sites\/2\/2021\/09\/figure-1.png\/\"><img decoding=\"async\" src=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-1024x768.png\" alt=\"\" class=\"wp-image-2180\" width=\"768\" height=\"576\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-1024x768.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-300x225.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-768x576.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-1536x1152.png 1536w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-2048x1536.png 2048w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-250x188.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-550x413.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-800x600.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-240x180.png 240w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-400x300.png 400w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-1-667x500.png 667w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n\n\n\n<p>The next graph shows the performance of the QSC <a href=\"https:\/\/www.qsys.com\/solutions-products\/power-amplifiers\/installed\/network\/cx-q-series\/cx-q-4k8\/\">CX-Q Series CX-Q 4K8<\/a> and <a href=\"https:\/\/www.qsys.com\/solutions-products\/power-amplifiers\/installed\/network\/cx-q-series\/cx-q-8k8\/\">CX-Q 8K8<\/a> amplifiers in a long-term continuous power test. Only the first 17 minutes of the test are shown since the amplifiers reach thermal equilibrium within that time and nothing changes substantially afterwards.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/blogs.qsc.com\/systems\/es\/app\/uploads\/sites\/2\/2021\/09\/figure-2.png\/\"><img decoding=\"async\" src=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-1024x768.png\" alt=\"\" class=\"wp-image-2181\" width=\"768\" height=\"576\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-1024x768.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-300x225.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-768x576.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-1536x1152.png 1536w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-2048x1536.png 2048w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-250x188.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-550x413.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-800x600.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-240x180.png 240w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-400x300.png 400w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/2\/2021\/09\/figure-2-667x500.png 667w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n\n\n\n<p>Both amplifiers are driving high impedance loads at 100 V drawing 600 W per channel (CX-Q 8K8) and 300 W per channel (CX-Q 4K8).&nbsp;All channels are loaded and driven with sine waves.&nbsp;For the first ten seconds, there\u2019s a gradual limiting of output power as the amplifier heats up.&nbsp;More aggressive protection happens between 10 and 100 seconds as the amplifier approaches its maximum allowable operating temperature. After this point, the amplifier\u2019s output power and operating temperature stabilize at a level that is both safe and sustainable indefinitely.&nbsp;At no time during this test did any channel exhibit signs of distress, such as excessive distortion, shut down or failure to reproduce the audio signal.<\/p>\n\n\n\n<p>While maximum power specifications are useful to suggest how amplifiers will perform under transient peak conditions, understanding continuous power specifications is essential when selecting an amplifier for high-availability use. While many amplifiers will simply shut down under continuous high-power use, the <a href=\"https:\/\/www.qsys.com\/solutions-products\/power-amplifiers\/installed\/network\/cx-q-series\/\">CX-Q Series<\/a> amplifiers will properly limit their output power under these same conditions to safe levels while producing uninterrupted audio.<\/p>","protected":false},"excerpt":{"rendered":"<p>Like most audio equipment, power amplifiers have a lot of specs associated with them, all of which can help us understand the performance and reliability of an amplifier. No single specification ever tells the whole story, which is why it\u2019s important to dig deeper to determine an amplifier\u2019s \u201cfit\u201d for the job. Max Power Most &hellip; <a href=\"https:\/\/blogs.qsc.com\/systems\/es\/2021\/09\/07\/what-about-long-term-amplifier-power-output-consultant-courier\/\">Read More<\/a><\/p>","protected":false},"author":35,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[28],"class_list":["post-2179","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-german"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What About Long-Term Amplifier Power Output? (Consultant Courier) - 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\/es\/2021\/09\/07\/what-about-long-term-amplifier-power-output-consultant-courier\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What About Long-Term Amplifier Power Output? (Consultant Courier) - Q-SYS\" \/>\n<meta property=\"og:description\" content=\"Like most audio equipment, power amplifiers have a lot of specs associated with them, all of which can help us understand the performance and reliability of an amplifier. No single specification ever tells the whole story, which is why it\u2019s important to dig deeper to determine an amplifier\u2019s \u201cfit\u201d for the job. 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