Muffling Peak Pressure Waves, a little physics

[kach22i]

Attached is an image of four simple systems, two are loudspeakers, two are air fans.

My goal here is to examine if any of these "boxes" do anything to lower the peak amplitude of the energy in the system and which does it better and why.

Could we think of any of these boxes as a muffler hooked up to a car engine? How similar or dissimilar would that be to what is shown?

.................................................. .................................

Q1: Imagine the loudspeaker generates a real low and then a real high frequency sound pressure wave.

1a. Which box muffles/dampens/attentuates the extremes better?

.................................................. .................................

Q2: Imagine the fan varies it's speed to generate real low and then a real high air flows which then result in low and high pressure waves.

2a. Which box muffles/dampens/attentuates the extremes better?

.................................................. ..................................