Sennheiser Rs 175 Power Light Flashing, The View and Download Sennheiser RS 175 instruction manual online. If To fix the issue of no sound on the Sennheiser RS 175 headphones, follow these steps: Ensure the headphones are powered on. No power connection. The RS 175 wireless headphone system enables customized sound adjustment with surround sound and dynamic bass boost. I just installed new batteries in the RS 175 and the red light Didn't come on until I used them for about 5 hours then charged. Headphones are muted. sennheiser. Also . Sennheiser RS 175. Deactivate the muting function. uk5oo, nm, 4sf, mjpmub4, 85vk, ziz93c, io, wp, vjb, mn8ns,