At 06:19 AM 10/10/2012, you wrote:
>I'm guessing the problem isn't with the grounding of the speaker but more
>likely something else since the message comes up saying the voltage is too
>high (or too low?). Grounding everything together is typically not a bad
>idea but grounding a speaker wire is typically not done on purpose.
If the audio output stage uses a bridged output stage (a common way
to increase output power on a limited DC supply voltage), then
connecting one side of the speaker to ground will put one of the
halves of the audio amp across the DC supply, putting stress on that
output transistor and any voltage regulators in circuit. Another
potential issue is if voltage regulation takes place on the negative
side of the supply. In this case, you'd short out the regulator
and expose the radio to overvoltage.
73 de VK3JED / VK3IRL