User's Manual

GL865 Hardware User Guide

1vv0300910 Rev.1 – 2011-07-22

page 51 of 79

EAR connection connection

The audio output of the GL865 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 8Ohm.

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 (ex:

16 or 8 Ohm), 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.

EAR+

EAR

MODULE

OUTPUT

DAC