Only found this forum recently and reading your posts (and debate) - extremely useful for beginners such as myself!!!

Im currently looking to upgrade the source for my stereo system. A local dealer lended me a DAC that has a pre-amp in it. Just for my understanding:

1) connecting the DAC to the current integrated amp (using RCA interconnects), am I using both pre-amps in the DAC and integrated amp? believe both dont have by-pass function.

2) if yes, does this complicate things, as signals are going through more circuits, and thus degrade the sound?

3) Can someone pls explain what exactly the pre-amp and power amp do to the sound signals respectively? I sort of understand the both are to "amplify" the signals.

Thanks.