The Classic4B, like the Classic4, is a reference loudspeaker system. This speaker system can be used as a stereo pair, or with the either the AC12 or Iso212 subwoofer. The driver type and placement allows for a larger critical listening area, providing a Hi-End audio experience in a listening area that normally might not. 
The relatively narrow vertical dispersion and extra wide horizontal dispersion accomplish this. The amazing Morel 130 Supreme mid-tweeter is transparent, resonant free and dynamic. The dual Vifa 7" bass drivers have a fast and deep presentation.
The Enclosure
The Classic4B enclosure is a 2 chamber, 4 driver, front vented oak or walnut enclosure. The Classic4B uses a vertical Bass-HF-Bass driver alignment. As with the Classic4 and Ibex, the Classic4B has removable levelung spikes on the bottom of the enclosure.The Drivers
The PRES Classic4B midrange-tweeter is a Morel Supreme ST 1308 dome, with a ferro fluid damped and vented neodymium pancake magnet system. This ensures a low resonant frequency with minimal resonance magnification and maximum driver control. This stability and control results in highly accurate, extended response with extraordinary power handling capacity and dynamic range. The ST1308 employs a super linear underhung VC and still has a 92dB sensitivity rating, due to the lightweight VC and neo magnet system. Dynamic Range you can hear.
Crossover Networks
The PRES Classic4B uses 14g I-core and air core inductors, Solen polypropylene capacitors and precision wire wound resistors in it's networks. We have developed, over time, optimal crossover points and slopes, resonance dampening and impedance equalization techinques, to produce the most linear and dynamic speaker we can. The Classic4 employs 3rd order Butterworth network filters.
Classic4B with tiptoes: Dimensions: 38"h x 9 1/2 "w x 7 1/2 "d (Tiptoes 1 1/2")
Frequency Response: 40- 20,000hz
Impedance: 8 Ohms nominal
Power Capacity: 400 WRMS
Dynamic Range: 75db (at rated power), 80db (10MS)
Subwoofer: AS12 or Iso212
Price: $1200.00 pr*
*depends on the dollar and does not include shipping
**This measurement was taken in the listening environment. A Free Field measurement would have been less meaningful for this loudspeaker, in my opinion.