Hi, and just briefly. Just got rid of my B&W XT 4`s as I`ve moved to a smaller place. I`m considering one of the two options. What on earth is the difference? Apart from the fact the 706`s are twice the price. Specs are identical, just about, although the 706`s have a Soft-Dome Tweeter as opposed to the 606`s Dome Tweeter, whatever that means? Even the same size, and they look the same. My amp and CD player are the Cambridge Audio Azur 651A and 651C. Transcriptors turntable. Many thanks