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To connect two Era 100 speakers to your Yamaha 5.1 analog amplifier, you'll need to ensure the speakers have the necessary inputs for an analog connection. The Era 100 speakers are likely designed for digital connectivity, so you may need a digital-to-analog converter (DAC) if they don't have analog inputs. First, connect your amplifier's pre-out or speaker outputs to the DAC, and then connect the DAC to your Era 100 speakers using the appropriate cables. Make sure your amplifier supports the additional load of the Era 100s, and adjust the settings to balance the sound output between all speakers. If the speakers support Bluetooth or Wi-Fi( Read more Your wifi name), you could also consider using a compatible receiver to integrate them wirelessly into your setup.

Note that there will be a 75ms delay when you connect the Era 100 speakers with an analog line in. Making them unsuitable for use with any speakers powered by your Yamaha for a 5.1 signal. 
 

Tenga en cuenta que habrá un retraso de 75 ms cuando conecte los altavoces Era 100 con una línea analógica. Haciéndolos inadecuados para su uso con cualquier altavoz alimentado por su Yamaha para una señal 5.1.

Muchas gracias a todos.