Originally Posted by mogrub
... Next time you play music that doesn't sound right to you (missing or muddled bass), go look at your Marantz. What does it say the playback audio mode is -- does the display say stereo, or does it say something else? Depending on your settings, it is possible your sub is not even receiving a signal during some or all of your music listening. That would very tidily explain why bass in your movies sound great ("the room shakes"), but bass in your music seems missing.
Of course, a very poor quality source material could have a similar effect.
The clip directly below is from page 179 of your manual, and your AVR will tell us (and you) everything we need to know about what kind of audio signal your various sources are feeding the AVR:
Shows the audio information for MAIN ZONE, as follows.
Sound Mode: The currently set sound mode.
Input Signal: The input signal type.
Format: The number of input signal channels (presence of front, surround, LFE).
Sample Rate: The input signal’s sampling frequency.
Offset : The dialogue normalization correction value. (Supe, ignore dialogue normalization, this has nothing to do with your issue.)
Flag: This is displayed when inputting signals including a surround back channel. “MATRIX” is displayed with Dolby Digital EX and DTS-ES Matrix signals, “DISCRETE” with DTS-ES Discrete signals.