Imac 12 watt digital amplifier

I saw in specifications of new imac 12 watt digital amplifier. What does this means exactly. Is this ment for driving passive speakers and also head phones.
Does this mean that 12 w are on the output of the audio line out?
Thanks in advance

The Apple developer note for each model lists the audio specifications. The digital amplifier is for the built in speakers. The primary external sound output is the optical digital line. The audio output (same connector) is specifically for headphones, not speakers. Specifications say Output Level: 1.75VRMS (+7.1 dBu). You need to supply a suitable amplifier if wanting to feed external speakers.

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