TV Sound Compression

I understand the need for compression (tiny TV speakers), but thought that it is done by TV station.  I discovered "Compression" setting in the menu on my new Sony TV.  When I turned it off sound became more dynamic, as expected.  I wonder if this particular TV has additional compression, that can be turned off, or TV sends always uncompressed audio.  I have no way to check/measure it.  My older Sony TV sounded compressed even when sending signal to external DAC-Amp-Speakers.