Thanks for the quick reply goodvibes! I appreciate the information, and yes, it did help conceptually with the issue.
However, I'm still in the same position because I'm not sure where 0dB would be on the volume control for the Sansa Clip+. Apologies if that's because I'm an idiot.
Apparently when using rockbox the volume controls gives a readout of the current dB, however the stock firmware volume control does not show the dB level, its simply a bar-type graphic.
I have the stock firmware and don't have any desire to switch to rockbox. If I need rockbox to get an accruate readout of the dB level I might consider using it, but I would prefer to continue using the stock firmware for now.
My assumption, based on the replies in this thread, is that on the stock Clip+ 0dB is at full/max volume. Correct?