Cherry's MTM and accompanying subwoofer
Cherry designed and built an MTM tower using PE's discontinued 6.5inch Bravox 4 ohm drivers and a peerless tweeter.  Lefty (aka Dan Carroll) had an opportunity to hear these speakers several months ago.
Cherry has now added an Onkyo 6x9 subwoofer (based upon 3 of the drivers plus a PE 300-792 plate amp) in a 3 cubic foot sealed box.  We fired up the sub today and obtained the expected performance (lots of bass).  These are 2 ohm drivers, so she wired them is series.  The plate amp has more than enough power to drive three of these drivers with lots of punch.  We estimate the anechoic F3 to be 53 Hz.