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  #11  
Old 03-02-2021, 04:19 PM
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Antonmb Antonmb is online now
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Originally Posted by PHC1 View Post
There is a limit to everything. One can keep pushing the transistors with brief bursts until one approximates the point at which they fail. Typically that is way outside the linear operating zone of the transistor or the sweet spot and would sound like crap anyways. Would not be honest but good for spec numbers.



Or one can conservatively say 180w vs the actual 200w that the amp can safely operate for example and call "that" extra headroom? That is not exactly good marketing either.



Further, the "dynamic headroom" breaks down into the chain of events that unfolds with various rooms/speakers. Same amp in two different systems would mean very different operating zones.



One guy listening at less than 1/3 rated power vs another who is bouncing off the dynamic ceiling with his large room, big, inefficient speakers and very loud SPL levels.



The more important question is, would an external device of any sort improve the actual specs of an amplifier?



Do the 200 mph ratings of expensive sport rubber tires make the car traveling at 55 mph faster? Would the car have more dynamic headroom at that speed because of those tires or because of its own reserves/dynamic headroom?



How about at 150 mph as the car bounces off the rev limiter and reaches the end of gearing and engine rpms? Does the rubber help it reach 200 mph?





Should one expect the amp to have a different bench measured result of performance plugged into the wall vs a power conditioner of choice? How does that work?


Yes, I get all that, I was just trying to state the commonly accepted definition of headroom in an amplifier. Re your car analogy, they would be 55mph rated tires that had the capability to be punched to 70 for brief durations.
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  #12  
Old 03-02-2021, 04:43 PM
PHC1 PHC1 is offline
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Yes, I get all that, I was just trying to state the commonly accepted definition of headroom in an amplifier. Re your car analogy, they would be 55mph rated tires that had the capability to be punched to 70 for brief durations.
Sure, if the amplifier can double its power into a decreasing load, it is said to have 3dB of headroom.

‘If the peak or dynamic power output rating is double the amount of the stated or measured RMS, Continuous, or FTC power rating, this would be an approximation of 3db dynamic headroom.”

Of course we all know that’s not twice as loud. To be twice as loud, it would need to increase power by a factor of 10.

What I’m confused about is when audiophiles talk about dynamic headroom when both the amplifier and power line supplying it with current are well within the operational zone and not at the limits.


The bass control and overall feel of amp to speaker interaction has much more to do with damping factors and current delivery of the amp. That has to do with the testicular fortitude of the amp itself. Capacitive storage, robust transformer and a beefy power supply.
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Old 05-16-2021, 08:01 AM
R.S. R.S. is offline
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My experience, after trying out stacks of poweramps, is that the trafo`s just has to be big. But not neccesarely that big in VA or watts but big in wire-diameter. Current is like water, and lower voltage means we need coarser pipes to compensate. Trafo`s primary windings should be ca the same diameter as what comes from the fusebox, and trafo`s secondary windings should then be big enough to compensate the voltagedrop.

And of course, speakerwires a.s.on must be same size if this shall breathe and bloom.

This should be the key to make what will be concidered as a "fast amp" while cheaper trafos with thinner windings might be compensated by using a huge capacitor-bank to help them breathe. But this "breathinghelp" will necessarily come a little afterwards and make the amp a bit slower or not so weightless, light on it`s feet.




This post has been made by using google translator
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