^ yea.. thats like apples/oranges.. [img]graemlins/laugh.gif[/img]

 

Last year I had to take a course entitled "Bioacoustics of Hearing".

At first I thought, "Hey! There talking about dB's and SPL's and stuff I could really dig this".

I got lost after the first paragraph explaining what decibels were. Mind you this was the first course I took since '96.

My studies never required knowing exactly how sound propagates. It more focused on how we hear. There were some interesting (but thick) reads on how sound travels.

How we hear is actualy quite misunderstood.

[ October 22, 2004, 06:34 PM: Message edited by: JRace ]

 

Actually 6dB is double acousical energy, IE double the displacement. Double power only yeilds sqrt(2) increase in excursion and therefore displacement, theoretically. </font>[/QUOTE]agreed..I believe I have posted before on this...not necessarily in the exact terminology but 4x power is required to make the cone of a speaker to move 2x as much wich in return only creates double acoustic energy..in open air will be received as 6dbB ..but in pressure it will be measured as only 3dB in an enclosed high pressure area such as an extreme vehicle

 

now its been a really long ime since I was a complete theory geek..maybe someone can refresh my memory... at which level will sound waves actually become visible? if I remember correctly ..is it not aprox 190dB? as you are speaking of it