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How does everything else from the speaker sound? If everything else sounds muffled, then there might be an issue with the speaker itself, which isn't readily repairable. If everything else is fine, check and see if the sound is coming out of the correct speaker. I am assuming you've adjusted the alarm volumes and rebooted the device...
3. If your Nuvi has a FM transmitter, is it selected to "FM" or "Speaker"? The "FM" setting will mute the internal speaker. Setting it to "Speaker" will send sound to the speaker.
if this side of it works then the FM transmitter is faulty
Check that the sound has not been MUTED
plug the earphone into the socket to see if any sound is heard. The socket is also a switch that takes sound from internal speaker to ephone and reverse. If no sound is hear in either FM or normal mode your unit is faulty and needs repair
If these speakers are two or three way speakers, it is possible that the tweeter(s) are blown in them.
Try and remove cover to check.
If the sound is not distorting, but just flat and muddy its the tweeters.
Put the other ones on this channel, to make sure it is not the amp.
First thing you wanna do is to try another set of headphones. If it still sounds muffled then theres a fault in the audio output section and these things are non user serviceable. Your gonna need to send back to the manufacturer. Good Luck