The speaker cone for the 2067 Master Station is mounted to the back of the plastic face plate. The 2067 / 2068 are identical except for the color of the Master Station. The 2067 has a brown finish and and the 2068 was a creamy white color. Based on the number of Master Stations I have seen, the 2068 in white was not nearly as popular as the 2067.
There is a cousin model to the 2067 / 2068, the 2062. The 2062 has a completely different face plate and since is was a lower priced model, it does not have any room control switches. Also the Master Station only has a 5" diameter speaker cone, compared to the 5" x 7" speaker in the 2067 / 2068