Hoffman's Iron Law of Loudspeakers and Related Discussion
Yang Ding-jun · Audio Engineering · 2010
In 1960s,a rule of thumb in loudspeaker design was described by Mr.J.A.Hoffman.It is called Hoffman's Iron Law.In the later years,Mr.A.N.Thiele and Mr.R.H.Small refined the law's mathematics.The Iron Law states that the efficiency of a loudspeaker system is directly proportional to its cabinet volume and the cube of its cutoff frequency.The importance of the rule is emphasized.Especially it means some specification limitations for different kind of loudspeakers.Design trade-offs is necessary.For mini loudspeaker systems,some solution ways are discussed.