"Mystery" Rectilinear Model
I have posted this before (and there are probably less than a dozen people in the world who care about this), but according to a 1976
driver replacement price list published by Rectilinear Research, the company issued the following Rectilinear speaker models and drivers (somewhat simplified with regards to categorization) from the launch of the III in 1966 to 1976; the year of publishing (all drivers in published diameter in inches):
As can be seen from the table, there are only five R models running four different drivers - III, Lowboy, 5, 7 and Disco 7. However, the owner states that the woofer is 10", and none of Rectilinear's models had four different drivers and a 10" woofer.
In case the owner is incorrect and the woofer is instead a 12", his mystery model could, if we go by the table alone, be the 5 or 7 (incl. Disco): However, we have ads (and other documentation, incl. photos) of the 5 and 7, and they look nothing like the photo in the picture. The mid looks like the 5" Philips whizzer, too, and not like a "7 in. mid woofer". One point of uncertainty is the Model XI, which seems to have undergone numerous iterations through its life. As well as the "7 Disco" - I have no idea about it, but one would think it would be a more recent (typically, this meant lower quality drivers and builds for Rectilinear) model.
One would think, based on the appearance of the mystery model, that this was a contemporary model to the III, Mini-III and Lowboy, and therefore a straightforward ID: But it is not - based on available information (see link to my Rectilinear database for the full reference) I have no idea what model this speaker is. I would love to find out (it couldn't be a custom built cab based on R drivers, could it?).:scratch2:
Ideas or suggestions are welcome!