"Timbre is the “quality” of sound (not good or bad), but how we recognize whether the sound is a clarinet, trumpet or vocalist playing/singing the same pitch. It is the absence or presence (strengths) of all the overtones above the fundamental or any pitch that is heard. Of course, this goes out at least four octaves and in reality, more. Ergo, if the bandwidth begins to drop at 20KHz, so does the ability to comprehend the full quality (timbre) of the notes, especially in the upper registers or tessitura."The point here is that maintaining bandwidth, and using every trick in the book to preserve musical timbre, happens in the input stage of a power amplifier. It is critical. That said, once we've built up high enough pressure in the input gain stage it is time to convert that pressure into something useful to a loudspeaker. Power. This task takes the muscle of the output current stage, the meat of a power amplifier, where pressure is turned into power. I want to spend at least one more day looking at the output stage without such a long, and necessary, preamble as we had today.
Pressure to power
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