Hi GreenLeo,
I received your email, thanks
If you plan to use an Integrated Amp (which already has a volume control), then I recommend you go with the FIXED rca outputs. There would be no reason to put another volume control in the signal path. It will be cleaner to use a fixed rca output, and use the volume control in your integrated amp.
If you were using a home audio power amp (and do not plan to purchase an external preamp), then the VARIABLE rca outputs are great because you can connect the rca output directly to your power amp and you'll have a remote volume control for it.
Correct - dedicated power amps do not have a volume control. They require a preamp (active or passive) to control the signal level coming from the source component. Otherwise, you'd get full output volume all the time!
I forgot to say 'thank you' to Cheemo for posting in response to your question (which I missed) to help you - thanks, cheemo!
Best regards,
Vinnie