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<blockquote data-quote="The Squeakquel" data-source="post: 8016682" data-attributes="member: 623069">That measurement has nothing to do with the amp being underrated.&nbsp; Your measurement doesn&#039;t include distortion, which is important when trying to compare to &quot;rated&quot; power which is rated at a specific distortion level.&nbsp; Every amplifier on the market is capable of producing more power than it&#039;s rated for, but the distortion increases to a significant amount at those levels.&nbsp; We also don&#039;t even know if that measurement with the DMM was RMS or peak, and that makes a huge difference.It also depends on how badly you were clipping the amplifier.&nbsp; Worst case scenario if you drove the amplifier to the point of producing a true square wave it would &quot;appear&quot; to have 2x the output since Vrms = Vpeak for a square wave.&nbsp; Point is, with knowing nothing but the voltage it&#039;s impossible to determine whether or not the amplifier is &quot;underrated&quot; as the results are in no way comparable to the rated power figure and generally aren&#039;t really useful at all.If you were using a 0db test tone then yes it&#039;s safe to go over 47.9V since music is almost never at a level of 0db.&nbsp; What is &quot;safe&quot; depends on many factors, and it&#039;s not something a DMM is going to be able to help you with.&nbsp; Which is why I said earlier to simply set it by ear.&nbsp; Even if you, for example, undershoot power by 20% by setting it by ear, the difference is not going to be audible.You don&#039;t need a scope, DMM or DD-1 to set a gain.&nbsp; Just your ear and common sense.In an ideal world the gain would be set exactly the same.&nbsp; All the gain is doing is adjusting the required input voltage to reach the target output voltage.</blockquote>

[QUOTE="The Squeakquel, post: 8016682, member: 623069"] That measurement has nothing to do with the amp being underrated. Your measurement doesn't include distortion, which is important when trying to compare to "rated" power which is rated at a specific distortion level. Every amplifier on the market is capable of producing more power than it's rated for, but the distortion increases to a significant amount at those levels. We also don't even know if that measurement with the DMM was RMS or peak, and that makes a huge difference. It also depends on how badly you were clipping the amplifier. Worst case scenario if you drove the amplifier to the point of producing a true square wave it would "appear" to have 2x the output since Vrms = Vpeak for a square wave. Point is, with knowing nothing but the voltage it's impossible to determine whether or not the amplifier is "underrated" as the results are in no way comparable to the rated power figure and generally aren't really useful at all. If you were using a 0db test tone then yes it's safe to go over 47.9V since music is almost never at a level of 0db. What is "safe" depends on many factors, and it's not something a DMM is going to be able to help you with. Which is why I said earlier to simply set it by ear. Even if you, for example, undershoot power by 20% by setting it by ear, the difference is not going to be audible. You don't need a scope, DMM or DD-1 to set a gain. Just your ear and common sense. In an ideal world the gain would be set exactly the same. All the gain is doing is adjusting the required input voltage to reach the target output voltage. [/QUOTE]

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