I have two tubes. Both are 12 feet long. One is 4" diameter for its entire length. The other has a 4" diameter segment for 4 feet, expands to 5" diameter for 4 feet, then reduces back to 4" for the remaining 4 feet. If the same sound is injected into both tubes, will the sound exiting the far end of both tubes be the same ??? Any info would be helpful. Thanks.