Right know while writing this thread I do extensive listening tests with my 4313B clones since one have a biased network clone now.

I found the 4313Bs where amazing from the first time I heard them.

The biased version still needs time to "burn" in. What I can say that the sharpness of female voices or trumpets or saxophones is gone. Additionally the highs open up. The biased version sounds absolutely open.

It's hell of work to build biased networks but I must say it pays off.

Who have similar or different experience with this?