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UnsungZero_OldTimeAdMan

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What about this? Seems to be designed for free air use, and with a relatively shallow mounting depth requirement.

https://www.cdtaudio.com/cdtnew22/products/components/woofers/cl69subcf.php

Caveat: I have literally zero knowledge about car stereo components, so I could be way off
Great find! It should still work well in an enclosure? Lowest frequency response is not as low as the MMAT but enough for most types of music. Probably better material than factory. And it needs less power (125 RMS). Now we just need to find out factory sub's mounting depth and impedance.

Rivian 2025 R1T Tri Max - Subwoofer Replacement - Upgrade to Premium Audio {filename}
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There is someone who did a 6x9 swap a couple of years ago with an amp.
My recollection is they did do some cutting inside the box.
I will try to find the link.
 

Reed1T

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Sooo, long story short, I have no idea how to link to another thread.

but if you search “ Aftermarket 6X9 subwoofer experiment in a 2023 R1T “

you will find someone who did a 6x9 swap.

edit: I added the link below.
 
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UnsungZero_OldTimeAdMan

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Sooo, long story short, I have no idea how to link to another thread.

but if you search “ Aftermarket 6X9 subwoofer experiment in a 2023 R1T “

you will find someone who did a 6x9 swap.

Top right corner of post... three connected dots, click/tap on that, you'll see social icons and a link URL below them. Left of URL, two overlapping rectangles, click/tap on that to copy link.
 

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UnsungZero_OldTimeAdMan

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Thanks for the tip!

here’s the link for anyone wanting to try a closer to drop in setup.

6x9 subwoofer replacement experiment experiment
Interesting. Rockville must be closing out that sub down to $60 now, originally $210. Lowest frequency response is higher than the other two, at 50 Hz. Mounting depth is longer at 4.75" and he got it to fit with some modifications to the enclosure, so that answers one question. Two things I would have done different: deadening mat on any available flat exterior of the enclosure + some poly fill inside the box. Poly fill "tricks" sub into behaving like it's inside a bigger enclosure. It's what car audio guys do when space is limited.
 

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Do we know if the factory "sub" is actually a sub... or is it a full range speaker with software crossovers to make it seem like a sub?
 

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Do we know if the factory "sub" is actually a sub... or is it a full range speaker with software crossovers to make it seem like a sub?
I would bet mid-bass speaker with software defined crossover.
 

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I bet not too many people were willing to buy a sub that bottomed out at 50hz. So the 60$ sale price doesn’t seem too far fetched.
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