External speaker is contained within the dock, you can try what Andrea suggests as the left lower part near home button is over the speaker connection. Otherwise you'll need to replace the dock.
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The external speaker is contained in an enclosure near the dock. You can try what Andrea suggests, as the left lower part near the home button is over the speaker connection. Otherwise, you'll need to replace the [https://www.ifixit.com/Guide/iPhone+4+Speaker+Enclosure+Replacement/4360|speaker enclosure].
External speaker is contained within the dock, you can try what Andrea suggests as the left lower part near home button is over the speaker connection. Otherwise you'll need to replace the dock.