I have checked for specs on the audio output of the Tivo S1 RCA jacks but can't find any info. What I want to do is to run audio to a set of earbuds. The TV has RCA audio outputs but I need to crank the volume way up to hear it. I briefly tried the earbuds on the Tivo RCA outputs and it was plenty loud. I have a headphone adapter on order that includes a volume control but I'd feel better if I knew that I wasn't going to overdrive the Tivo audio out with the low impedance of the earbuds.