So I just filled my trunk well with a roll of foam, and in my frunk I put a memory foam pillow and then packed the rest of the frunn void with a duvet (yeah, real scientific). I then brought up a audio spectrum analyzer on screen and recorded a loop around the block: half traveling 60km/h on a straight way that had different asphalt patches, the other half was 40km/h residential.
I then removed all the padding and did it again. I can't say I noticed much difference, but I will listen to the audio and look at the analyzer graphs later when I get a chance.
But until I get a chance (I may not), here are two screenshots from the analyzer from the two separate laps, at the same point on the road:
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