Dynaudio Core Series User Manual page 14

Vertical angle
The vertical angle of the monitors should orient the monitor directly toward the listener's ear level. If the monitor is
placed higher than the listener, they should be angled downward. Conversely, if the monitor is below the listener's
ear level, they can be angled upward to point at the ear as shown in Figure 5.
Figure 5: Listening angle vertical
14 Core User manual