This is somthing to do with so called "Spatial effect". The methodsdecribed above are not easy to achieve and tune with limited mechanicalspace and allocations. As you may see, these type of cellphones arerelatively large.
For your information, this can also be done through software DSP with ONE loudspeaker.
Believe it or not....amzing results....
[br]<p align=right><font color=red>+5 RD币</font></p>