Dear Hifineubee,
Thank you very much for your kind reply. I can see that you are quite familiar with B & W speaker series system. One of the audio dealer also has same opinion about the lip &mouth's friction (high frequency) produced by B & W's tweeter. Also, I can aware some abnormal high frequency response on the B & W D seriesspeakers on the Youtube. The obstruction of the high frequency sounds odd. That means they are not smooth.
As for the 805D3, I have seen HiFi + web review that the speaker need to be played with higher volume. I think it would not be normal for I have heared the speaker,but with high volume, it would bring stress either on the ears as well as psychology pressure.
Recently, I pay attention to the listneing surroundings in HongKong's audiophiles. As you might know that most of Hongkong's home are rather samll, but as I notice that many of the audiophile in there have owned more than one system or with complicated accomodations with various accessories to bring up their sound better. You can find they have small speakers more than one pair, but also they have various gears to serve them. Some small space also use big size speakers.
I'll consult with the experienced audio dealer in Taipei about your opinion and hope I can get the conclusion for my next step with better sound. Anyway, thank you very much for your generous sharing of precious knowledge about B &W speakers.
See you again.