Phase plug [pair] for coaxial drivers.

This is a phase plug for when you use an external horn for the tweeter with the coaxial drivers as the midrange.  You can leave it empty and is sounds very good, but this also helps smooth the response when in use.  The phase plug comes to the edge of the cone where the surround starts, this helps guide the sound from the cones center to the baffles exit limiting phase issues.  Hence the name phase plug. 

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