A:AnswerAny amp/recievers with either an optical input or standard L/R audio in. I can't imagine any modern recievers that wouldn't have either or both.
A:AnswerYes it can, I will give you some advise. When recording if you record at a slower speed you pretty much can play the recorded CD on any cd player.
A:AnswerPut a CD in it and push "play".
This is not a troubleshooting forum for your very old product - the dx-700 doesn't even have digital (coax or optical) outputs.