I couldn't find much information on these through google. This speaker is a 12" by the control panel and a 10" in the front.
There are no air escape ports.
This is good , deep bass , you'll hear basically zero highs .
It has all of the old school A/V source inputs and a dial volume control
If i had to guess this is mid 1980's 
Dimensions are: 20" tall 14" wide and 15" deep
42 pounds without packaging
It has some light scuffs , and average wear for its age, but it looks really nice in the Light Oak color.