Sound bar question

I know that using a sound bar would not improve the sound while using a loop system! However when I watch tv with the sound off  the sound is ok . When I watch tv with my wife she turns the volume up and this affects the quality of the sound.  However according to what is said the tv volume is best turned down with a sound bar. My question is would I still be able to hear through my Sarabec loop with a sound bar?