@shadorne
You’re clearly not a fan of B&W and that’s quite alright. But I expect you to conduct a thorough research before you diss a fine product.
In addition to minor cosmetics changes, the D2 version made significant improvements starting with the Rohacell woofers redesigned with smaller dustcaps, but their smaller size is a function of a B&W’s new "mushroom" diaphragm construction, which bonds the cone, dustcap, and voice-coil bobbin into a single unit rigid as a girder. A more potent electromagnetic engine drives the new woofers, powered by a motor system with two neodymium magnets to provide a more symmetrical magnetic field over long excursions, thereby reducing distortion and increasing dynamic response.
D2 diamond tweeter was reengineered as well. It has a new suspension, and four high-permeability magnets are used to reduce dynamic compression at high volumes.
And lastly, the use of gold-silver-oil Mundorf capacitors in the HF crossover filter.
Hmmm...I see how all of the above adds up to very colored sound :-)
In some circles, continues improvements over a existing design is a sign of forward progress and not a sign of inconsistency.
PS: I believe Benchmark didn’t start with DAC3, it was culmination of design improvements over DAC1 and DAC2.