I know this is a Jeep forum, and many will either find this boring, or not important, but audio is one of my hobbies, and has been for a long time, and audio related questions do pop up fairly often. If interested, please keep reading.
Now on to why your dash speakers suck. It's not because of your particular speakers, assuming you are using something even half way decent (not that speaker quality doesn't matter, but it wouldn't matter what you used if left like image 1), it's because the factory mount allows the rear wave to cancel out the front wave of the speaker causing no bass. See image 1, the red arrows are a cheesy way of showing how the rear sound waves move around to the front of the speaker and interact with the front wave. Because they are 180 degrees out of phase from each other, you end up with very little to no lower/mid bass.
Some replace their speakers, but are fighting a winless battle if left as image 1. Some use the over priced sealed pods. Those address the issue with cancellation seen in image 1, but cause their own problem. The enclosure is way too small. That effects the speakers frequency response. What you end up with with is instead of complete cancellation, you get very little lower/mid bass and overly boosted upper bass in the 250hz region. That doesn't sound good either, and will not blend well at all with a subwoofer.
The most simple and effective way I found to deal with this, is to isolate the front and rear sound waves of the speakers as much as possible.
In image 2, I used some flashing material to cover most of the gaping hole. In image 3, I covered it and every hole I could with sound deadening material. Stuff that is butyll rubber with a foil backing. I even sealed up the gap between the speaker and the plate under the steering wheel as that matters too, and did the same on the other side. I then covered it all in black duct tape, just so the shiny silver wouldn't show through the grill, but that might not be needed. I did the drivers side first and left the passenger side as is, and the results was dramatic.
Home Depot even sells something that will work, in their roofing section. Speakers just need the front and back waves separated to a good degree, if you do so, you'll get way better bass response, but if you already own the small pods, make a hole in the rear around 1" if possible, or as big as you can, without cutting the whole back off.
Here are the rest of the pics.
Now on to why your dash speakers suck. It's not because of your particular speakers, assuming you are using something even half way decent (not that speaker quality doesn't matter, but it wouldn't matter what you used if left like image 1), it's because the factory mount allows the rear wave to cancel out the front wave of the speaker causing no bass. See image 1, the red arrows are a cheesy way of showing how the rear sound waves move around to the front of the speaker and interact with the front wave. Because they are 180 degrees out of phase from each other, you end up with very little to no lower/mid bass.
Some replace their speakers, but are fighting a winless battle if left as image 1. Some use the over priced sealed pods. Those address the issue with cancellation seen in image 1, but cause their own problem. The enclosure is way too small. That effects the speakers frequency response. What you end up with with is instead of complete cancellation, you get very little lower/mid bass and overly boosted upper bass in the 250hz region. That doesn't sound good either, and will not blend well at all with a subwoofer.
The most simple and effective way I found to deal with this, is to isolate the front and rear sound waves of the speakers as much as possible.
In image 2, I used some flashing material to cover most of the gaping hole. In image 3, I covered it and every hole I could with sound deadening material. Stuff that is butyll rubber with a foil backing. I even sealed up the gap between the speaker and the plate under the steering wheel as that matters too, and did the same on the other side. I then covered it all in black duct tape, just so the shiny silver wouldn't show through the grill, but that might not be needed. I did the drivers side first and left the passenger side as is, and the results was dramatic.
Home Depot even sells something that will work, in their roofing section. Speakers just need the front and back waves separated to a good degree, if you do so, you'll get way better bass response, but if you already own the small pods, make a hole in the rear around 1" if possible, or as big as you can, without cutting the whole back off.
Here are the rest of the pics.
