The Ohm versions of the Walsh drivers suffered from very poor assembly techniques. That is, the voice coil was not properly placed in relationship to the magnet / pole piece and the suspension ( spider, surrounds, etc...) were not properly slected. The end result is less than optimum performance in most every respect and drastically reduced efficiency / drastically increased compression.
This is why Bill Legall of Millersound referred to the Ohm A's & F's as being "broken from the factory". Addressing these problems basically means rebuilding the driver, but the results can be staggering to say the least.
I'm quite certain that the increased efficiency of the DDD stems from FAR greater attention to detail in the design & assembly of the driver. By limiting bandwidth of the driver, efficiency is also increased. If one were to read Walsh's original patent info, Walsh specifically stated that this design could be built to cover a VERY wide frequency spectrum. Only problem is that the wider the spectrum, the lower the efficiency.
Line: I'm lost as to what you're trying to say. Then again, i've not gotten much sleep in the last few days, so...
Unsound: The German Physiks speaker uses a passive crossover, not an electronic crossover. While the passive could be considered "electronic", that terminology is typically reserved for an "active" crossover. Don't know if that's what you meant, but thought this should be clarified for those that aren't familiar with the design. Sean
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