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<blockquote data-quote="trumpet" data-source="post: 8149016" data-attributes="member: 628688">I&#039;ve seen that before somewhere, and it&#039;s a bunch of hogwash. This is written from the perspective of someone who has a huge bias against full range Class D technology without doing any actual research into the current state of the technology. The JL XD series does not use negative feedback. They filter the switching noise. Test reports on <a href="http://www.pasmag.com" target="_blank">PASMAG | PERFORMANCE AUTO AND SOUND - Welcome</a> show the actual measured output, including THD, of many Class D amplifiers of a wide range of prices.Here&#039;s one: <a href="http://www.pasmag.com/car-audio/test-reports/1805-test-report-precision-power-p9004-amplifier-" target="_blank">Precision Power P900.4</a><a href="http://www.pasmag.com/car-audio/reports/2516-jl-audio-xd5003-amplifier-review-" target="_blank">JL XD500/3 review</a><a href="http://pasmag.com/car-audio/reports/3179-clarion-xc1410-amplifier" target="_blank">Clarion XC1410</a><a href="http://pasmag.com/car-audio/reports/2625-clarion-xc6410-amplifier-review" target="_blank">Clarion XC6410</a><a href="http://pasmag.com/car-audio/reports/2366-kicker-ix5004-amplifier-review" target="_blank">Kicker IX500.4</a>All of these amplifiers, including the one you own, should be totally transparent. This means the amplifier is strictly increasing the amplitude of the music coming in without adding or taking anything away.</blockquote>

[QUOTE="trumpet, post: 8149016, member: 628688"] I've seen that before somewhere, and it's a bunch of hogwash. This is written from the perspective of someone who has a huge bias against full range Class D technology without doing any actual research into the current state of the technology. The JL XD series does not use negative feedback. They filter the switching noise. Test reports on [URL="http://www.pasmag.com"]PASMAG | PERFORMANCE AUTO AND SOUND - Welcome[/URL] show the actual measured output, including THD, of many Class D amplifiers of a wide range of prices. Here's one: [URL="http://www.pasmag.com/car-audio/test-reports/1805-test-report-precision-power-p9004-amplifier-"]Precision Power P900.4[/URL] [URL="http://www.pasmag.com/car-audio/reports/2516-jl-audio-xd5003-amplifier-review-"]JL XD500/3 review[/URL] [URL="http://pasmag.com/car-audio/reports/3179-clarion-xc1410-amplifier"]Clarion XC1410[/URL] [URL="http://pasmag.com/car-audio/reports/2625-clarion-xc6410-amplifier-review"]Clarion XC6410[/URL] [URL="http://pasmag.com/car-audio/reports/2366-kicker-ix5004-amplifier-review"]Kicker IX500.4[/URL] All of these amplifiers, including the one you own, should be totally transparent. This means the amplifier is strictly increasing the amplitude of the music coming in without adding or taking anything away. [/QUOTE]

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