Trusted Reviews looked at the Logitech Z-5450 Wireless Speakers

The other half is audio. The vast majority of people are quite content
to simply use the built-in speakers in the TV. However, on some TVs, such
as a couple of the budget ones we tested here, the quality of the audio
output is less than stellar. Even for TVs where the sound quality is excellent,
the best you'll get is stereo. Certainly, some TVs offer pseudo surround
modes but it's still no substitute for a decent surround system, that can
really bring alive DVDs, or even watching sport.

Logitech Z-5450 Wireless Speakers Review