How are these materials for soundproofing?

[ice512]

Planning to line the floor and the wheel wells with some sound proofing material and was looking at Dynamat alternatives.

Does anyone have any input/opinion/knowledge/experience with the following materials?

http://www.aircraftspruce.ca/catalog/appages/supersoundproofmat.php

http://www.aircraftspruce.ca/catalog/appages/soundproofinstall.php

http://www.aircraftspruce.ca/catalog/appages/dampingpanels.php

http://www.aircraftspruce.ca/pages/ap/soundproof/insulator1.php

Thanks in advance!

[Lumberjack]

It all has to do with "resonance" of an object or material. Dynomat is very easy to work with and has sound deadening qualities. There is always a compromise between sound deadening and ease of installation. Personally, I have never bothered but I am getting old...