It's been a while since I have mentioned the Fletcher-Munson curves as sound relates to the human ear. For a more complete explanation just Google it and read the information.

I have noticed at times when checking recording levels that certain passages will sound louder even tho the levels are correct while other passages will peak the meter but sound lower in volume. The ear is not a linear device as the tests have shown. Some balance has to be maintained in a recording so you don't overload parts of a recording and distortion happens. If you want to raise the level a bit when copying it can be done up to the red line.

One other thing is the playback equipment you are using. It may have some limits in reproducing the sound as well as it was recorded.

Ray E. Strode