Need Help with Speakers/soundbar/etc. for Person with Hearing Difficulties

I recently purchased a new Samsung UN55ES6500 TV for my mother, who has minor hearing difficulties. She could hear the sound coming out of her old CRT fairly easily (requiring only a slight increase in volume). However, the new TV's sound was too high-pitched and hollow for her to discern dialogue, so I purchased a Samsung HW-E450 soundbar for her. This was an improvement over the internal speakers, but she still had problems with it. I suspect that the soundbar's 3d Sound Plus feature is the problem... the virtual surround creates a hollow tone that interferes with her hearing. What is the best solution to replicate the sound coming out of an old-school CRT TV set?