> 7.1 | Mechanical and Quality Issues

> High sensitivity of microphone and small speaker distortion increase the efficiency of DSP echo cancellation and noise reduction routine.
> If the microphone is sealed with rubber or glue on its backside, this reduces the backward sensitivity of the microphone.
> The speaker shall combine high modulation of membrane with low distortion. A lot of distortion is produced in the plastic housing of the speaker or, for example, in the glass display of PDA or phone. A high speaker volume will be achieved if forward and backward space of the speaker are well separated by sealing the speaker at the housing.