The UltraWhamos are 7-1/2' tall 9" wide and 21" deep and use the Raven R2 tweeter, as does jc morrison's open baffle speaker. jc's speaker also uses a subwoofer for bass below about 200Hz. The Ultrawhamo takes advantage of the 55-1870 driver's great bass, the tower is composed of individual .4 cu. ft. vented compartments for each woofer.  Response is amazingly flat down to 40 Hz. Crossover is currently 3rd order, around 4kHz. SPL is 99 dB. the tweeter also has it's own chamber, which contains the crossover. Wiring is CAT-5 cable.

Here is the backside of the tower, showing the individual 3/4" dia. 3/4" long ports for each woofer. The cabinets are currently lined with "acoustic foam". Doc thought that felt carpet padding might work better, as there is a wee bit of 'muddle' in the mid to lower midrange. probably caused by internal reflections that come back out thru the cone.
The bracing created by the dividers for the individual bass boxes makes the tower super rigid. The cabinet sounds like concrete when you rap on it!
In spite of the small woofers, bass is ample In Ed's room - it is actually a bit on the heavy side at certain frequencies. The difference between tube rectification and solid state rectfication was quite obvious, with ultrafast SS rectifiers clearly winning in terms of bass speed and control.
Also seen in the photo above are Ed's Altec A5s. While the A5s had the advantage in midrange presence (a problem in the UltraWhamos which was addressed, as shown on the next page), the Ultrawhamos pretty much whupped their butts on th bottom end. The Raven is superb on the top end, with either the UltraWhamo, or used as a supertweeter for the A5s.