I have a 10" Powered Kenwood sub that is in the design of a bazooka tube. Right now it is sitting parallelto my rear seats...right against them and touching the right corner. I hear a lot of vibration instead of pure thump when music with heavy base is played (rap). How can i reduce the vibrations i hear of the subwoofer so that i get a crisp, thumping base that i feel more than hear. I was thinking about sitting the sub on foam, or a towel or something...but i don't want to reduce any power and im not sure if that material would do that...any help?

 

Dynamat? Or, ice and water shield (roofers use it).

ice and water shield is similar stuff... and costs about 1/50th of dynamat.

 

I have a 15 in the back of my b5, and i've tried a could configurations:
1) in the spare tire well. Actually sounded really good i think because the accoustics where amplified by being in a sort of second chamber.
2) directly behind the rear seats standing up and facing toward them. My logic: if the speaker is pointing directly to the cab, it should be louder right??? WRONG. sounded like ****. finally, simply sitting in the trunk facing UP. actually works the best, and sounds the cleanest because it is using the trunk as another air box and the accoustics aren't being muffled at all.

I think when i get a better sub though I'll be fiberglassing it into the spare tire well so it's flush with the trunk floor.

 

The key to sub performance is an absolutely rock solid mounting. I made a custom enclosure out of 3/4" MDF that replaces the storage cubby on the passenger side in the trunk (I refuse to give up trunk space). It is a single 10" Pol/Momo sub driven by an 1100 watt dedicated amp, and the sound is awesome. The key is not only the glued and screwed enclosure (including a double layer of MDF on the surface where the sub is mounted), but also that it is solidly bolted to the body at the three mount points where the storage cubby was attached. At high volume the enclosure does not move at all.

If your enclosure moves at all, this is power you are spending that is not going to moving the cone, and therefore is not generating sound waves. The parasitic loss can be very significant. My advice would be to securely attach your tube sub.

(Oops - meant to say the storage cubby on the DRIVER'S side)

 

so i gotta anchor the sub down somehow....velcro strips maybe? i will think of something

 

Unfortunately when it comes to tubes or boxes, the manufacturers expect you to screw them down (see http://www.crutchfield.com/S-FFz64Ri...&display=L#Tab and http://www.crutchfield.com/S-FFz64Ri...5B702KIT&g=743). If you would rather not drill holes, gripping onto the carpet with some kind of hooks/spikes might work, or you could screw the tube onto something heavy like a patio stone or heavy piece of timber (spikes on the bottom would prevent it from sliding around). I had considered a tube sub but rejected it since I didn't like the mounting options.