In article ,
"Meindert Sprang" wrote:

You are right, of course, when it comes to a normal speaker and AC audio
signals. But the OP was talking about a fog horn, so I assumed this radio
has an extra DC output to drive a fog horn. Right?

Meindert

Nope, most, if not all, Radio/Hailer/Foghorn combo's use a Waveform
Generator feeding the audio circuit. The "Giveaway" was he stated that
it was a 20 Watt Audio Speaker, that he wanted to drive from both
systems.


Me