“Is there an audible echo effect when using the Sennheiser RS 160 Headphones with TV external speakers also on? I have about a 65% hearing loss and would like to use the headphones to help me hear the TV while others are watching. I hope to use them with my over the ear hearing aids on. I have read multiple reviews, some of which suggest there is an echo effect caused by a slight timing difference in the TV speakers and headphone sound, others claim they do not hear this effect.”