2024 CX-5 Turbo with Bose system. I installed the Caresa Cargo Liner (TPE - rubber-ish plastic) and I have a sense that the Bose spare tire well subwoofer is not a "punchy" as before, but it could be my imagination. Has anyone else noted any change in sound with a cargo mat installed and, if so, what Bass setting did you find most helpful?

Michael

 

I have the Mazda OEM rubber mat and it doesn't really impact my Bose subwoofer at all. I think I have my bass set to +2.

 

Any added layer of material between you and your audio system speakers will impact the sound of said hardware, including a subwoofer.
Noticing any difference depends on the hearing abilities of the individual who is listening.
With your hearing you detected a difference which likely means there is a difference.
If you are so inclined, you can measure the decibel levels to give you a definitive scientific answer.
But you must use the exact same audio format/music track and volume setting.

 

Regarding woofers and sub woofers. Generally, it is the tone that changed which non-audiophiles call muffled. Also, BOSE system in any vehicle is specifically designed which includes how the frequencies are adjusted to the exact interior with no mats, factory or aftermarket.