Talk:Phase plug

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A fact from Phase plug appeared on Wikipedia's Main Page in the Did you know column on 27 February 2013 (check views). The text of the entry was as follows:

Did you know... that the first phase plug in a horn loudspeaker was developed in the 1920s by Bell System engineers?

A record of the entry may be seen at Wikipedia:Recent additions/2013/February. The nomination discussion and review may be seen at Template:Did you know nominations/Phase plug.

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Compression Ratio

What is the Compression Ratio from the phaseplugs and what is the increase of the db?