‘Thin’ is still subjective. With all the different ways that AVR allows you to alter the lower frequencies, I have never experienced this particular negative symptom. To me it sounds like configuration is the key here. Plus an active subwoofer helps too. :) I think the setup/configuration is salient. If the EQ software doesn't have the subwoofer level high enough, I think the sound will seem "thin". Active subwoofers helps for sure to treat thin-sound sickness. :D