Create Blue Speaker

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.

Click to enlarge

Representing the loud - speaker came to end!