Yes, DBpoweramp compares to Accurate Rip if this is enabled.
I have done FLAC, AIFF and ALAC to .wav comparisons at shows for probably 7 years now. Its easy to hear the compression effect of these, even on a show system. Why do they do this? I can only speculate. Maybe has to do with the offset or floating point rounding. Maybe has to do with erroneous behavior when the CODEC is running real-time.
Every time I play FLAC, AIFF or ALAC files, I notice a "tunnel" effect. This is kind of like compression. Makes the sound stage narrower. I only have .wav on my server and that is all I play at shows.
There is one exception. The Antipodes server playing FLAC and .wav files sounds identical from what I can tell. There is a lot of custom software running on Linux there.
You don't need to keep the .wav files. You can always create the .wav back from them.
Steve N.
Empirical Audio