I too have burned audio only on DVD. Sound quality is very good. That is why you will never see a DVD recorder with digital inputs.
>>"I was also wondering if I were to feed prerecorded dvd video/audio signals to the dvd recorder via my receiver would the copy guard still be a factor or will the receiver act as a filter and allow the dvd recorder to copy the movie?"<<
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Forget that, if the DVD you want to copy has copy protection your receiver will not filter it out.
What you can record from a copy protected DVD is the audio only. The copy code protection is in the video carrier. Just disconnect the video from the DVD recorder.
>>"I was also wondering if I were to feed prerecorded dvd video/audio signals to the dvd recorder via my receiver would the copy guard still be a factor or will the receiver act as a filter and allow the dvd recorder to copy the movie?"<<
>>>>>>>
Forget that, if the DVD you want to copy has copy protection your receiver will not filter it out.
What you can record from a copy protected DVD is the audio only. The copy code protection is in the video carrier. Just disconnect the video from the DVD recorder.