Was a noticeable improvement
Initial impressions with the Burson V6 Vivid opamp installed in place of the LM4552NA exhibited a much clearer instrument separation [...]
My group ordered 2 pieces of V6 classic dual & 2 pieces of V6 vivid dual. They are DIY headphone [...]
I purchased the Classic version and find it very musical, very good textures, no digital harshness, highly recommended.