So my truck came with the MTX Thunderforms speaker box under the rear seat. To me the sound was always a 4/10. Better than nothing but still really really sub par. A buddy of mine needed money and I bought his Rockford Fosgate P3 10" subs from him. They are huge compared to the MTX subs. They are both 10" but I swear the RF is more like an 11" sub. Its way wider. At least the mounting ring is at least 1" wider.
To get them to fit I had to create some space. I made a ring out of 3/4" wood. The weird thing is that the opening in the sub box isn't perfectly round. Not even close. So I had to make this weird oval type shape. I also had to trim the mountings for the subs a little bit. I also have to raise the rear seats at least 3/4" to clear the box. Easy with some 1" round stock I had laying around. Fun little project. I hope they sound good!
I don't know if this was typical but I used some black RTV silicone on the underside of the wooden ring. The mounting surface is a little uneven and I was worried that the screws alone wouldn't make a tight seal.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fxkz1yxldf%2FIMG_0442.jpg&hash=7ab12e39f44257757dde1523ae760748)
Had some spare speaker box carpet from a project like 8 years ago. I am glad I don't get rid of anything.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2F4vc629u83%2FIMG_0443.jpg&hash=9f4196e00ab1263470c9aab06c2c993f)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fg7ork35hv%2FIMG_0444.jpg&hash=e71bea99469dd0ea77fec6db3c28f941)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fue4ifat7n%2FIMG_0448.jpg&hash=22131120f42592ea79bc2fc3a89354e4)
Look at the difference!
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fg7ork2amr%2FIMG_0445.jpg&hash=9cb1423d709069b22b9f34dd708cb170)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fx87nsratf%2FIMG_0446.jpg&hash=2ad005ac8c06bc837dd5815daa655630)
Also, this music station or whatever on youtube is excellent.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2F7rz72lps3%2FIMG_0449.jpg&hash=d86e0771bf29585b4a69825aeacc3e2c)
To get them to fit I had to create some space. I made a ring out of 3/4" wood. The weird thing is that the opening in the sub box isn't perfectly round. Not even close. So I had to make this weird oval type shape. I also had to trim the mountings for the subs a little bit. I also have to raise the rear seats at least 3/4" to clear the box. Easy with some 1" round stock I had laying around. Fun little project. I hope they sound good!
I don't know if this was typical but I used some black RTV silicone on the underside of the wooden ring. The mounting surface is a little uneven and I was worried that the screws alone wouldn't make a tight seal.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fxkz1yxldf%2FIMG_0442.jpg&hash=7ab12e39f44257757dde1523ae760748)
Had some spare speaker box carpet from a project like 8 years ago. I am glad I don't get rid of anything.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2F4vc629u83%2FIMG_0443.jpg&hash=9f4196e00ab1263470c9aab06c2c993f)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fg7ork35hv%2FIMG_0444.jpg&hash=e71bea99469dd0ea77fec6db3c28f941)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fue4ifat7n%2FIMG_0448.jpg&hash=22131120f42592ea79bc2fc3a89354e4)
Look at the difference!
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fg7ork2amr%2FIMG_0445.jpg&hash=9cb1423d709069b22b9f34dd708cb170)
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2Fx87nsratf%2FIMG_0446.jpg&hash=2ad005ac8c06bc837dd5815daa655630)
Also, this music station or whatever on youtube is excellent.
![](/proxy.php?image=https%3A%2F%2Fs19.postimg.cc%2F7rz72lps3%2FIMG_0449.jpg&hash=d86e0771bf29585b4a69825aeacc3e2c)