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How many Speakers can be attached to an AMP?

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In order to make a speaker (SP) sound, it must be connected to an amplifier (AMP), but how many SPs can be attached to one AMP?​
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Lo-Z and Hi-Z

First of all, what we should be aware of from our professional knowledge is 
that there are two types of AMP and SP.
The two types are one for low impedance (Lo-Z) systems and one for high impedance (Hi-Z) systems.
Lo-Z system and Hi-Z system are mainly used as follows.
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​How many Speakers can be attached to an AMP?

These are determined by only two values: rated input value/output value (W) and impedance (Ω) determined for SP and AMP respectively. However, the conditions are different for Lo-Z and Hi-Z.
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>> Detail: In LoZ, which should be larger, AMP or SP?



​Below are some details.

How do we find each value?

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​How do we calculate the total impedance in Lo-Z?

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​What will happen to the system if the above conditions are not met?

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* However, in systems that handle large volumes, an AMP with a larger capacity than the total wattage of the SP is often selected in order to reliably amplify even momentary large peaks contained in the signal. In this case, of course, the SP must also be able to withstand the momentary peaks.
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