Nil wrote:
On 19 Aug 2012, cj wrote in alt.home.repair:

I recently bought a new flat screen tv that I hooked up directly
to the cable line coming into the house( no cable box). The sound
quality was crummy so I returned it and went with a different
manufacturer and still the sound quality is bad...sounds like its
coming from an empty can, that is, it sounds hollow. I am
wondering if its because I don,t have a cable box. I tried to
tweak the bass and treble but it still sounds hollow, for lack of
a better word. Anyone else have a similar problem?

Bass and treble controls will do nothing to affect a "hollow" sound
quality. Those controls only affect the bass and treble (surprise,
surprise!)

Try hooking your computer speaker system up to the TV as a test. You
will almost certainly hear a dramatic improvement. Then look for a
permanent solution.

Hmmm,
Tone control? Really good amp/speakers needs only volume control.
If you want to have good sound system, sky is the limit for the cost.
Also real good pro level Tv does not have audio amp inside or speakers.
It is just a display panel fed by amps. and video/audio processor.