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<blockquote data-quote="THATpurpleKUSH" data-source="post: 7284902" data-attributes="member: 615398">Vas is NOT the amount of box volume that the speaker uses......Vas/Cms&nbsp; &nbsp; &quot;Equivalent volume of compliance&quot;, this is a volume of air whose compliance is the same as a driver&#039;s acoustical compliance Cms (q.v.), in cubic meters. &quot;Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker. Vas is one of the trickiest parameters to measure because air pressure changes relative to humidity and temperature — a precisely controlled lab environment is essential. Cms is measured in meters per Newton. Cms is the force exerted by the mechanical suspension of the speaker. It is simply a measurement of its stiffness. Considering stiffness (Cms), in conjunction with the Q parameters gives rise to the kind of subjective decisions made by car manufacturers when tuning cars between comfort to carry the president and precision to go racing. Think of the peaks and valleys of audio signals like a road surface then consider that the ideal speaker suspension is like car suspension that can traverse the rockiest terrain with race-car precision and sensitivity at the speed of a fighter plane. It’s quite a challenge because focusing on any one discipline tends to have a detrimental effect on the others. &quot;I suggest reading this page:<a href="http://www.the12volt.com/caraudio/thiele.asp" target="_blank">Car Audio: Thiele-Small Parameters</a></blockquote>

[QUOTE="THATpurpleKUSH, post: 7284902, member: 615398"] Vas is NOT the amount of box volume that the speaker uses...... Vas/Cms "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters. "Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker. Vas is one of the trickiest parameters to measure because air pressure changes relative to humidity and temperature — a precisely controlled lab environment is essential. Cms is measured in meters per Newton. Cms is the force exerted by the mechanical suspension of the speaker. It is simply a measurement of its stiffness. Considering stiffness (Cms), in conjunction with the Q parameters gives rise to the kind of subjective decisions made by car manufacturers when tuning cars between comfort to carry the president and precision to go racing. Think of the peaks and valleys of audio signals like a road surface then consider that the ideal speaker suspension is like car suspension that can traverse the rockiest terrain with race-car precision and sensitivity at the speed of a fighter plane. It’s quite a challenge because focusing on any one discipline tends to have a detrimental effect on the others. " I suggest reading this page: [URL="http://www.the12volt.com/caraudio/thiele.asp"]Car Audio: Thiele-Small Parameters[/URL] [/QUOTE]

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