Role Audio | the best small speakers Submitted by role2 on Wed, 05/04/2022 - 12:09. I received an email recently from someone who was questioning my approach to transmission line speaker design as a special case of acoustic suspension sp Submitted by role2 on Wed, 05/04/2022 - 12:09. I received an email recently from someone who was questioning my approach to transmission line speaker design as a special case of acoustic suspension speaker design. He said his first speakers were AR 2A speakers. He said he is “a big advocate of sealed boxes since there's no question properly ...