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New QSC amp ????
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<blockquote data-quote="John Roberts" data-source="post: 92843" data-attributes="member: 126"><p>Re: New QSC amp ????</p><p></p><p></p><p></p><p>In fact peak or max current has been a design limitation for class D power amps since the early days. Class D involves saturated switch power devices that output a PWM or duty cycle modulated square wave. In slower analog power amps it is common to parallel multiple power devices to get more current. For high speed switching applications trying to parallel devices and get them to switch at exactly the same time is not so easy. </p><p></p><p>A lot of the increases in class D power output have been linked to device technology advances (higher voltage higher current individual devices). I am still making wild assed guesses about these new amps, but suspect they use an IC chipset driving outboard power devices, but still simple device pairs per output. I have talked to people smarter than me about this and they say it is possible to parallel switching devices, but i have not seen this done in mass market designs so believe what you want. </p><p></p><p>Getting back to the question a basic class D power amp will be power limited by power supply voltage, and power supply current, "and" device voltage/current limits. I haven't been in the trenches for a while, in the early days the class D amps were challenged by switching device voltage and current (early Peavey class D amps only delivered modest power by today's standards and did not support 2 ohm operation limited by the SOTA for switching devices back then). </p><p></p><p>Devices keep getting better but I doubt large audio amps are a big enough market to justify huge component development investment just for them. Perhaps a chip set for all power levels, but not just for high power. For the record I have no idea what the current SOTA is for these guys. or what industry is really driving the switching device development (IMO not audio, maybe solar power or electric cars? While electric cars are low volume too... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />.</p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 92843, member: 126"] Re: New QSC amp ???? In fact peak or max current has been a design limitation for class D power amps since the early days. Class D involves saturated switch power devices that output a PWM or duty cycle modulated square wave. In slower analog power amps it is common to parallel multiple power devices to get more current. For high speed switching applications trying to parallel devices and get them to switch at exactly the same time is not so easy. A lot of the increases in class D power output have been linked to device technology advances (higher voltage higher current individual devices). I am still making wild assed guesses about these new amps, but suspect they use an IC chipset driving outboard power devices, but still simple device pairs per output. I have talked to people smarter than me about this and they say it is possible to parallel switching devices, but i have not seen this done in mass market designs so believe what you want. Getting back to the question a basic class D power amp will be power limited by power supply voltage, and power supply current, "and" device voltage/current limits. I haven't been in the trenches for a while, in the early days the class D amps were challenged by switching device voltage and current (early Peavey class D amps only delivered modest power by today's standards and did not support 2 ohm operation limited by the SOTA for switching devices back then). Devices keep getting better but I doubt large audio amps are a big enough market to justify huge component development investment just for them. Perhaps a chip set for all power levels, but not just for high power. For the record I have no idea what the current SOTA is for these guys. or what industry is really driving the switching device development (IMO not audio, maybe solar power or electric cars? While electric cars are low volume too... :-). JR [/QUOTE]
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