Quote:
Originally Posted by Ian - G4JQT
It doesn't matter. There is no DC going through a speaker when driven through a transformer. In fact there should never be any DC going through a loudspeaker in a conventional set up, so it never matters.
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It matters if you have more than one speaker, either stereo or twin speaker mono. If they are out of phase you will get signal cancellation.
Quote:
Originally Posted by Stylo N M
I would be a bit carefull about placing a fully charged 9 volt battery directly accross the speaker terminals, as the susspension of the voice coil, could easily be damaged, due to it's age brittleness and fragility.
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Good point, with an older small speaker such as this probably best to use a 1.5v battery.