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Old 10th Aug 2018, 1:45 am   #5
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
Default Re: Payphone 500 / 600 handsets

A PA horn will give as much audio from 10mW as 100mW into a typical cone speaker. Adequate listening power from a tranny in other words.
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