Can I run a Passive Speaker without an amplifier?

Joson asked Oct 16,2020

Can I connect a 0.5W Speaker direct to an input (Raspberry pi in my case) and expect it to be as loud as a let's say a phone speaker? Will a very small speaker work directly from an input? If not which low powered amplifier would you recommend in my case where I don't have much space to spare for.

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