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I'm interested in the optimal alignment for absorbing the rear radiation of a high frequency loudspeaker (ie ribbon).
A stuffed transmission line is intuitively the alignment that comes to mind as it theoretically dissipates waves completely above a certain frequency that is relative to the length of the line. What happens to waves that are larger than 1/4WL of the longest dimension?
For example, lets assume that a ribbon loudspeaker is mounted at one end of a closed 12" transmission line that is stuffed with polyurethane open-cell foam (similar to what Dr. Geddes uses in the Summa for the foam plugs). What happens to waves >48" (1/4WL, 279hz).
A stuffed transmission line is intuitively the alignment that comes to mind as it theoretically dissipates waves completely above a certain frequency that is relative to the length of the line. What happens to waves that are larger than 1/4WL of the longest dimension?
For example, lets assume that a ribbon loudspeaker is mounted at one end of a closed 12" transmission line that is stuffed with polyurethane open-cell foam (similar to what Dr. Geddes uses in the Summa for the foam plugs). What happens to waves >48" (1/4WL, 279hz).