Question about Optoma Hd144x

I have never measured it. But in normal mode, the beamer is already audible. However, the sound drowns out the noise of the projector.
In Eco mode, on the other hand, you can't hear it even without sound.
The projector is placed right above the sofa.

Hello Herzogn

The manufacturer's homepage also says 25dB.
I assume that if it were louder, the manufacturer would have declared this.

Greetings John