Yamaha YAS-109 Schnellstartanleitung Seite 140

Part names and functions
Front/top panel
a Speakers
b Dual built-in subwoofers
The built-in subwoofers are located in the top part of the unit.
10
En
a
b
c
d
b
a
c Remote control sensors
Receive infrared (IR) signals from the remote control of the unit
(p.13).
d Microphones
Used to interact with Alexa.