This may be irrelevant because They are so old, and apparently scarce . . .
I have a pair of Infinity Monitor IIa speakers that I bought in 1974/5. They are described in the user manual as Transmission line and go on to elaborate on the spec's (ie the length of the line). They listed in 1975 for $700. The published frequency response is 22Hz - 27kHz +/- 3dB. Regardless of whether they really do 22 Hz at -3dB, the bass I hear is wonderful. They are a 4-way design - the super tweeter is an inverted cone Walsh tweeter. I still love to listen to them. I switch between them and my Totem Sttafs. They don't image as quite nicely as the Totems, and the upper bass isn't as well defined, but I get that good, deep, and natural bass with them that works better on a lot of music.
I'd like to have another pair for my home theater . . . but haven't found anyone else that has a set, much less one they are willing to part with.
I have a pair of Infinity Monitor IIa speakers that I bought in 1974/5. They are described in the user manual as Transmission line and go on to elaborate on the spec's (ie the length of the line). They listed in 1975 for $700. The published frequency response is 22Hz - 27kHz +/- 3dB. Regardless of whether they really do 22 Hz at -3dB, the bass I hear is wonderful. They are a 4-way design - the super tweeter is an inverted cone Walsh tweeter. I still love to listen to them. I switch between them and my Totem Sttafs. They don't image as quite nicely as the Totems, and the upper bass isn't as well defined, but I get that good, deep, and natural bass with them that works better on a lot of music.
I'd like to have another pair for my home theater . . . but haven't found anyone else that has a set, much less one they are willing to part with.