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.