"Cold, metallic sound"???
I don´t have the same experience with them. I used to have them as front speakers with Beolab 4000 in the back and vice versa for a short period. The 6000s had a nice, warm feel to them, but they lack some bass. I connected an active KEF subwoofer, a sub suitable for music.
I was very happy with this setup. I sounded very nice. And the 6000s look stunning!
My 6000s were from year 2000, I am not familiar with any changes but it is peculiar that the opinions about this speaker differs that much.
BV10, Avant DVD, BL5, BL4000, BS2300, BV6-26, MX 4002, 2xBeocom 6000, LC2