How to Improve OE Sub Bass Quality and Eliminate Vibrations

[RGlbk1]

This shows how to remove everything

Thank you!

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[chilly9797]

Hey all anyone know the part number to the piece you drill out the port holes? Want to modify an extra one. Not worried about the expense unless ridiculous. I am not too mechanically inclined so want the extra so I don’t mess up the original. And any suggestions where to buy online is greatly appreciated.

 

[30MilesOffshore]

Rear Cover - Toyota (64285-WAA01)

https://parts.olathetoyota.com/oem-...hJnk9MjAyMCZ0PXByZW1pdW0mZT0zLTBsLWw2LWdhcw==

 

[chilly9797]

Rear Cover - Toyota (64285-WAA01)

https://parts.olathetoyota.com/oem-parts/toyota-rear-cover-64285waa01?c=Zz1ib2R5JnM9aW50ZXJpb3ItdHJpbS1yZWFyLWJvZHkmbD0zMSZuPUFzc2VtYmxpZXMgUGFnZSZhPXRveW90YSZvPWdyLXN1cHJhJnk9MjAyMCZ0PXByZW1pdW0mZT0zLTBsLWw2LWdhcw==

Rear Cover - Toyota (64285-WAA01)

https://parts.olathetoyota.com/oem-parts/toyota-rear-cover-64285waa01?c=Zz1ib2R5JnM9aW50ZXJpb3ItdHJpbS1yZWFyLWJvZHkmbD0zMSZuPUFzc2VtYmxpZXMgUGFnZSZhPXRveW90YSZvPWdyLXN1cHJhJnk9MjAyMCZ0PXByZW1pdW0mZT0zLTBsLWw2LWdhcw==

this forum is amazing thank you so much. Any clue if it comes with the carpeting on it and the rear pads or is it just a plastic?

 

[speedlimit]

this forum is amazing thank you so much. Any clue if it comes with the carpeting on it and the rear pads or is it just a plastic?

I bought mine used off eBay for about $60 and it came with the panel and pads.

 

[afkdoorbell]

Do not overpack the bass cavity with wading...You'll destroy lower bass response..

As described in my writeup only the inner walls of the cavity should be covered...I know some people have had problems in the past placing the thin sheet wadding against the walls...And although less than ideal, you can also pull the wadding sheets apart to fluff them up and very loosely fill the cavity...Just do not compress the wadding or you'll greatly reduce low end bass response...

Hi,
So the key is to fill the cavity with the wadding but not pack it to max?
I filled mine up but haven't filled to the point where I can't stuff any more.

I just didn't know how to know when is the right amount?
Mine isnt' the roll up type, it's the polyfill
https://amzn.to/45NwpBW

 

[swrdply400mrelay]

Hi,
So the key is to fill the cavity with the wadding but not pack it to max?
I filled mine up but haven't filled to the point where I can't stuff any more.

I just didn't know how to know when is the right amount?
Mine isnt' the roll up type, it's the polyfill
https://amzn.to/45NwpBW

Not sure how to quantify it, but I initially packed it tight and tested the bass, it was horrible. Took some out and improved a lot. I’d test the sound to see if you can tell there’s an improvement.

 

[afkdoorbell]

Not sure how to quantify it, but I initially packed it tight and tested the bass, it was horrible. Took some out and improved a lot. I’d test the sound to see if you can tell there’s an improvement.

Yeah I'll play with how much. From what I'm seeing and reading, maybe have enough room for air flow and room inside.

 

[calmeda1]

Hi,
So the key is to fill the cavity with the wadding but not pack it to max?
I filled mine up but haven't filled to the point where I can't stuff any more.

I just didn't know how to know when is the right amount?
Mine isnt' the roll up type, it's the polyfill
https://amzn.to/45NwpBW

I originally over filled it and it killed the bass. I took it all out and re-filled it just enough to cover the inner walls. 10000% better. Just cover the walls and leave the center hollow

 

[afkdoorbell]

I originally over filled it and it killed the bass. I took it all out and re-filled it just enough to cover the inner walls. 10000% better. Just cover the walls and leave the center hollow

Yup, I took alot out and my god it sounds so good I wanna cry lol
My Supra actually sounds like it has subs instead of blown out 1920s speakers.

Yay!!

 

[Loco38SUP]

I originally over filled it and it killed the bass. I took it all out and re-filled it just enough to cover the inner walls. 10000% better. Just cover the walls and leave the center hollow

I did the same and took it all out. It sounded much better without it.

-RJM

 

[tadda]

If you go back to my very first post the intent was never to fill the entire volume of the cavity with batting...The sheet batting was to be used to simply line all the metal walls to soften the internal reflections effectively increasing the cavity volume...

That said, some people seem to struggle with unfolding the sheet batting to line the cavity walls and it ended up that they started overstuffing / packing the entire cavity with the batting which to no surprise degraded the bass response!

Side note: Can't believe it's been over 5 years since my original post!

 

[JerseyMKV3.0]

Did this and added some EarthQuake SWS 2ohm since I have a Mobridge amp crazy different now appreciate this post!

 

[chilly9797]

Hey all! So I did the fix sounds better ported. Though I feel like I am now getting feedback from a rear tweeter. Doubt it has anything to do with it as the sub seems to be fine. Is it coincidence or anyone have this issue? Did I blow a tweeter on a 6 month old car?

 

[mack73]

I did the normal mods here but was unhappy with the low hit - just not quite enough for me. So I swapped out my speakers with the Earthquake SWS 4ohm versions. Plug and play (includes spacer ring and wiring adapter to plug into OEM harness). Low hits are WAY better than the stockers - I haven't listened to the Bavsound or Alpha speakers so I can't compare, but for those that want some more low hit without an aftermarket amp/sub box this is a great option at $240 https://www.amazon.com/dp/B002MRD4SE . Thinking of adding some low pass inline filters to cut out the high frequencies. But even like it is now its great.

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