I know this is probably an obvious question. If tubes works way above almost all speaker impedance and a speaker varies from a dead short to 20 ohms (8 ohm speaker) when it moves causing distortion, why can't you just have a huge resistor inline? I was just figuring a 800 ohm tube 792 ohm resistor with 8ohm speaker varies around 792 to 812 thats around 2.5% of variation which would cause that a nearly fixed sound response from the tube right and, tuning to a fixed response could mean the perfect amp? I was just thinking.
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This would give you something approximating to a current-driven speaker, rather than voltage driven. In general, SPL is roughly proportional to voltage drive rather than current drive, so you would get some unpleasant frequency response errors with that resistor in place. Not to mentions the astonishing waste of power in the resistor!
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