Designed meaning that if it is not allowed to put out all the current it can, then you won't get the full rated power, meaning your sound will be quieter and maybe less clear. The amp will pretty much put out how much voltage it's putting out in any situation, and it's designed to put out a certain amount of current along with that. That means your amp is designed to put out its rated power with a specific ratio of voltage to current. The answer to that question is chosen by the amp designer and is your amp's rated output impedance. But you need lots of current to make a speaker move, so you have to trade some of that voltage in for more current. The ratio of voltage to current coming out of power tubes is relatively high. What does that mean? Well if you know what voltage and current and power are, then one way to look at impedance is how much of the power you are putting out is in voltage and how much is in current? That ratio is one interpretation of impedance. A tube power amplifier (like the final stage in your Mark V) has to have an output transformer to lower the output impedance (the "Ohms") to a level appropriate to drive a speaker.
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