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Junior Varsity
Power amplifier sensitivity question....
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<blockquote data-quote="Michael John" data-source="post: 49905" data-attributes="member: 830"><p>Re: Power amplifier sensitivity question....</p><p></p><p>Thanks Ivan. My point is that the amp output will clip long before the input stage ever clips, so why does the input stage need so much headroom?</p><p></p><p>(Yes, I understand that turning the amp down allows me to drive the amp harder. In my case I get far better signal to noise because my Lake Contours can drive 20 dBu or higher on output. I typically run my QSC PLX series at -10 dB on the level controls and adjust the Lake limiters accordingly.)</p><p></p><p>Back to the QSC example I mentioned. This amp has two other sensitivity or "attenuated" settings/modes. These effectively change the amp gain from 34.5 dB to 32dB and 26 dB. The maximum input level changes from 11 V to 14.6 V and 25 V respectively. (The input sensitivity changes from 1.2 Vrms to 1.6 Vrms and 3.28 Vrms.) So from all these numbers, regardless of the input sensitivity setting/mode, the amp's output will clip long before the maximum input levels are ever reached.</p><p></p><p>Am I missing something?</p><p></p><p>Best,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 49905, member: 830"] Re: Power amplifier sensitivity question.... Thanks Ivan. My point is that the amp output will clip long before the input stage ever clips, so why does the input stage need so much headroom? (Yes, I understand that turning the amp down allows me to drive the amp harder. In my case I get far better signal to noise because my Lake Contours can drive 20 dBu or higher on output. I typically run my QSC PLX series at -10 dB on the level controls and adjust the Lake limiters accordingly.) Back to the QSC example I mentioned. This amp has two other sensitivity or "attenuated" settings/modes. These effectively change the amp gain from 34.5 dB to 32dB and 26 dB. The maximum input level changes from 11 V to 14.6 V and 25 V respectively. (The input sensitivity changes from 1.2 Vrms to 1.6 Vrms and 3.28 Vrms.) So from all these numbers, regardless of the input sensitivity setting/mode, the amp's output will clip long before the maximum input levels are ever reached. Am I missing something? Best, Michael [/QUOTE]
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