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12.1.3 EAR Connection
The audio output of the UE910 is balanced, this is helpful to double the level and to reject
common mode (click and pop are common mode and therefore rejected).
These outputs can drive directly a small loudspeaker with electrical impedance not lower than
16 Ohm.
TIP: in order to get the maximum audio level at a given output voltage level (dBspl/Vrms), the
following breaking through procedure can be used. Have the loudspeaker as close as you can to
the listener (this simplify also the echo cancelling); choose the loudspeaker with the higher
sensitivity (dBspl per W); choose loudspeakers with the impedance close to the limit, in order to
feed more power inside the transducer (it increases the W/Vrms ratio). If this were not enough,
an external amplifier should be used.
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