I hate to tell you this the hard way, but, its just the way that this particular model was made. The speakers on those models only output 5 watts if I am not mistaken, possibly 10(which still isnt very loud). The manufactures just made them that way. The only way you are going to get any more sound from them is if you use some sort of external speakers.
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Based on what you have tried if a buzz or loud static via the speakers you have something wrong in the audio output circuit of the set--problem here is that circuit may be part of the Main board that processes all signal---a look inside---following the speaker leads back would lead you to that board.
A simple thing to do to narrow it a little (you may have done this) is with sound all the way off put your ear to the internal speaker--hear anything at all like a deep hum?
Depending on age of set and cost of the board likely bad it may or may not be a do it yourself repair.
Tries tv unplug,replug it back like about an hour later to let the tv resetting itself back to the factory setting.Go into Menu go to AUDIO Setting go down to reset back to the original setting.If this dosen't help the whole tv Tuner signal board is the causes and the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a whloe refurbish tv Tuner signal board for the replacement.
Sharp has had a few problems with their audio boards, not finding any bulletins on this model, but a few complaining about low audio on amazon reviews section. If using an antenna you will experience some channels with low audio. If using cable you should get good sound on all channels..
the 9.1 and 9.2 are digital channels and sharp does display them for at least a few seconds when you switch to that channel. Check all your setting in the audio to Stereo never SAP. To options for you are get a cable box, first check in the back and see if there is another coax in, if there are two try both rescanning after connecting.