User's Manual

UE910 V2 Hardware User Guide

1VV0301065 Rev.1 – 2013-12-12

9.1.3. EAR Connection

The audio output of the UE910 V2 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 32Ohm.

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.