Press on Alt button and make simultaneously a mouse's click between the previous layer and the middle part of the recently made one. The layers will be placed one on the other.
Using the Ellipse Tool (U), we have to represent the next layer of the loud - speaker.
The layer's parameters:
Fill 0% on the layers.
Blending Options>Drop Shadow
Blending Options>Inner Shadow
Blending Options>Stroke
Gradient's parameters:
Make a copy of the last made layer and choose again the Free Transform option to change the copies' sizes and apply different parameters for the copies.
The layer's parameters:
Fill 0% on the layers.
Blending Options>Drop Shadow
Blending Options>Inner Shadow
Blending Options>Outer Glow
Blending Options>Stroke
Now we'll apply the previous instrument (Ellipse Tool (U)) and represent a circle. For the beginning we'll represent the outside edges and then press on the Alt button to cut out the inside part of the circle.
The layer's parameters:
Blending Options>Drop Shadow
Blending Options>Inner Shadow
Blending Options>Outer Glow
Blending Options>Gradient Overlay
More Tutorials: 
