A:AnswerThe RCA outs do NOT bypass the built-in speakers, as far as I can tell. The external speakers I'm experimenting with have RCA- and aux-in. Aux-in does appear to bypass the built-in speakers, playing only through the externals.
A:AnswerAre you sure you’re putting the toggle lever in the UP position and making sure you have set the dial to the right function you’re trying to use?