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Damping isn't an issue, but damping factor can be

A single ended triode amplifier without global feedback will have a damping factor much lower than 20, more like 3, and if it's connected to a speaker with a widely varying impedance curve (say a three way bass reflex speaker with a complex crossover), there will be noticibly variations in frequency response of the system. It's not a show stopper, but it makes matching speakers all the more critical. My amplifiers have damping factors of about 4-5, and it definitely impacts the frequency response with some speakers.


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