I currently have HTD level 3 mains which can be biwired and a pioneer 811s reciver. If I biwire, will the impedance of the HTDs change? They are rated at 8 ohms. The Pioneer manual states that I have to use speakers with impedance between 8 to 16 ohms. I have also read a thread here that said that the Pioneer have problems handling 6 ohms. Also, has anyone biwired the HTD 3? Did it improve sound quality? What do you guys think?