This is the Decware Phase Guide that we use to modify the 8 inch Fostex, Audio Nirvana and Lowther drivers...

It is now available for the D.I.Y. speaker builders and hardcore tweakers.

Installed, this guide will focus up and extend the highs resulting in a very noticable imaging improvement.

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Read about it here!

Diameter:  1.300 inches

Height:  1.575 inches

This is a 3D view of the Decware Phase Guide.  

You can read about how it works in the white paper.