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2021 TB Zues Bronze Activ
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Discussion Starter · #1 ·
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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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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I spoke with the dealership manager where we purchased our Trailblazer and asked about the speaker under the spare. He said it's a subwoofer which is part of the Bose 7 speaker system. Basically it's the 7th speaker in the system instead of the base 4 or 6 speaker systems. If you remove the spare and play some music you can hear speaker playing the lower frequencies.

Steve
 
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How does that explain the presence of this speaker in models without the Bose 7 speaker system? At this point, I have literally zero faith in the credibility of dealership knowledge for the '21 Trailblazer.

It is possible that both explanations are true, and the speaker is used for the ANC sound system as well as the entertainment sound system, concurrently.
 

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The fact that the speaker plays music says it's at least part of the sound system and has to be a subwoofer since the frequencies it plays are low. It is also possible that it's part of the sound cancellation system, but I can't find any information to support it. I agree it's a good idea not to trust everything the dealership tells you since they all act like they know everything anyway, but it's clear they don't know much about the new Trailblazer.

Steve
 
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It would be good to learn which vehicle configurations do not include the speaker under the spare tire.

Our Activ AWD has one despite not having the Bose sound system, but the speaker housing also has a suspicious sticker labelling it as a pre-production sample. Could our early Activ have been accidentally misconfigured at the factory, perhaps?
 

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Discussion Starter · #9 ·
I don't think I have the Bose system (doesn't say anything about it anywhere) but I have the speaker back there. I will have to look for the sticker about a "sample".
 

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Discussion Starter · #11 ·
hum will have to look for that.
 

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Found more info about the spare tire speaker and the active noise cancellation system.

ANC is standard on all AWD equipped Trailblazers, but isn't available without AWD. ANC uses the small microphones inside the cabin to listen for unwanted noise/harmonics and then transmits a sound signal to all of the speakers to cancel the unwanted frequencies.

The subwoofer under the spare tire is made by Bose and is called a Richbass woofer. It should be part of the Bose 7 speaker system, but many people here have it without the upgraded Bose system. The "pre production sample" sticker might indicate that many of the early Trailblazers got the speaker even though they don't have the Bose system. It would be helpful if we did a poll to see how many people without the Bose system still got the spare tire subwoofer.

Steve
 

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Discussion Starter · #13 ·
How do I know if I have the Bose system? I do have the rear bass speaker but have not looked closely for the "pre production" sticker thingy.
 

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How do I know if I have the Bose system? I do have the rear bass speaker but have not looked closely for the "pre production" sticker thingy.
Do you still have the window sticker which shows what options your Trailblazer is equipped with? You could also look for the RPO (regular production option) code found on the production code list which I believe is under the cargo tray. I do know that the Bose system has a small "Bose" logo on the front door speakers, at least mine does anyway.

Steve
 

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Discussion Starter · #15 ·
does not sound like I have Bose then. Still sounds pretty good.
 

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Some pics of the spare tire subwoofer in my RS with the Bose premium 7 speaker system. I do not have the "pre production sample" sticker that some have, just a GM sticker with "Made in Germany" on it. It's a cool little subwoofer with a clear cone and bass vent port.

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Steve
 

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I just order a Trailblazer LT with out the Bose. Not because i didn't want it just didn't want fake leather seats lol.
It would be nice too see how many none Bose systems have that speaker
 

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It would be nice too see how many none Bose systems have that speaker
Yes and the people who do have the sub without the Bose system also seem to have the "pre production sample" sticker on the housing. My RS with the Bose premium system doesn't have that sticker.

Steve
 
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