Thanks. This has been a fun discussion but apologies to 69x22 for pulling the topic of this post not just into the weeds but now through the weeds, through the guard rail and halfway into the corn field.
You're absolutely right. Formed steel is completely different. With different boundary constraints, bends and dimples, you can change the performance of the panel. They test it by having something apply a known force and measure the response using an array of accelerometers to measure the response.
Dynamat has done something to determine the effects of their acoustic material to the patterns. Look at what they say for their XTreme product.
http://www.dynamat.com/technical_spe...at_xtreme.html
I'm not sure what the effective absorbing range it can cover but for gear noise it needs to be most effective in the 300 - 600 Hz range to absorb gear mesh frequencies. That product may only be effective at absorbing lower road noise related frequencies.
Not sure on that.
