Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
Transmission lines and bass-reflex speakers have some similarities. Both have a primary resonance that is used in conjunction with the driver's resonance, to control it and to tune the system. The thing that makes transmission lines tricky is the fact that there are multiple higher resonants that need to be addresed. I suggest that you model any proposed TL speaker with Martin King's spreadsheets at www.quarter-wave.com.