[drdoan]

you must use the RCA connection as the optical is digital and my not work. If your mixer has a digital output, you could go from the mixer to the stereo with the optical connection. Your mixer's output will work either way (tape out, or, main out) as long as you set the levels correctly. the RCA out may not have the volume control inline and won't be adjustable, but, it could. the Main out will be adjustable by the mixer's level controls. Your Mike cable length is fine. The mixer's levels will have to be set to allow the correct output to the stereo. I believe you can do this using Room EQ Wizard. I think most people who are having adaptor problems are using USB to MIDI adaptor cables to go from their computor to the Barringher Feedback Destroyer, your cables and mixer should be fine. Remember you will have to get a response curve for whatever mike you use and enter that into the Wizard. And finally, the Radio Shack SPL will do a great job and is easier to set up. Hope this helps, but, please wait for others with more knowledge to answer. Have fun, Dennis

update: i posted my response before I saw Brucek's more correct response. Dennis