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

Gradient’s parameters:

Using the same Ellipse Tool (U), we’ll represent the primary layer of the loud – speaker’s clamp.

The layer’s parameters:
Fill 0% on the layers.
Blending Options>Inner Glow

Blending Options>Gradient Overlay

Gradient’s parameters:

Applying the last instrument, it’s possible to draw the upper part of the speaker’s clamp.

The layer’s parameters:
Fill 0% on the layers.
Blending Options>Outer Glow

Blending Options>Gradient Overlay

Gradient’s parameters:

Blending Options>Stroke

Now we have to combine in a group all the layers composing the speaker’s clamp (press on Ctrl button and mark out the necessary layers. Then make a click on the left mouse’s button to take the marked layers downside on Create a new group option). The group must get the next parameters:
The Opacity is set on 80%.

Make three copies of the last made group and select Free Transform option to change the sizes for each copy and their position on the picture.

Representing the loud – speaker came to end!

View full size here.