I hate to say it, but those foam baffles really won't do much, nor does polyfill. I've tried the polyfill before and all it did was collect dust back there. The biggest issue the stock dash speakers have, is that the mount is full of gaping holes, and that leads to bass cancellation because the rear sound waves from the speaker interact with the front. Not unlike holding a speaker in your hand and playing it. It will have no bass.
If you use a small sealed pod, it eliminates the front to rear sound wave cancellation, but then restricts the speakers ability to make bass because it's too small, so you end up with excessive upper bass, which not only sounds bad, it also gives the impression of no lower bass.
The absolute simplest and most effective approach, baring something very complex, is to simply seal the front of the mounting surface and do nothing behind the speaker. This works, and works very well in comparison to anything else I've tried.
As the mount is from the factory, you can see how the rear wave can and does cancel out the front wave, causing very weak bass.
And then below, you can see how I sealed the mounting surface, and the bass is dramatically improved. There is nothing going on behind the speaker at all. Just the mounting surface is sealed off, and this prevents the rear sound waves from negatively impacting the front wave.
View attachment 125213
View attachment 125214
or to replace them with what others have been posting here for years?
