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What is the purpose of that back there if it is COVERED. Really odd.
 

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I have an educated guess about this.

We do not have the Technology Package on our TB, so it's the standard entertainment sound system. However, we do have a second sound system which is the Active Noise Cancellation (ANC comes standard with AWD). The ANC system should be playing back an inversion of the wave patters from road noise and engine noise, to reduce the interior perception of these sounds.

The standard entertainment sound system is specified to have 6 speakers. There are two speakers for each front door, and one speaker for each rear door, making the six. However, there are additional tiny speakers located at the interior handles above the front doors. I think that these speakers are part of the ANC sound system, and I suspect that the speaker inside the spare tire is also part of the ANC sound system. I doubt that Chevrolet would miss out on an opportunity to market the inclusion of a "subwoofer" with the entertainment sound system.

I might be wrong about this, but that's my guess.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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It's a subwoofer. That's why it's mounted under the cargo tray. Subs only produce non directional low frequencies. It's still very small and questionable how much low end it really adds though.

Steve
 
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