Bvdiman, thanks for the info, in fact, the 611 and 801A are both in pristine condition. I was there for 4 hours listening. In the middle of listening session, there is one FMA owner shown up and join my audition, he also compared 801A and 611 before purchasing.
He also choose 801A instead of 611, 801A has more solid bottom end, mid and high are "darker" than 611, sound satge is deeper than 611. 611 is more pleasing to listen in the beginning, But 801A generates more accurate soundstage and more "body" than 611.
The owner of 801A is considering to buy 611, too, he told me that bi-wire is another "dream combo" he could reach another level of music heaven base on his real world experience. He also auditioned 1811, but the price is too steep for his budget, 1811 easily give him both world he is looking for (801A + 611), but bi-wire option can give him both world (95% of 1811) at less than half price of 1811.
810A has fan in the back side, which is noisy when it starts to function, so he decide to place 801A a little bit far from listening position, now he can live with 801A without the annoying fan noise.
