Yeah, if you try out various recordings you get an idea what certain transducers perform best on. I really like the mids of dynamic drivers like the HD6XX if it's sourced well. The mids sounds quite natural. But also I do love the shimmer of the highs of the planars, which provides bite and shimmer to the instrumentals. If I were to make an ideal transducer it would be something that can bring natural mids of dynamics and lows and highs of planars. Certain recordings do sound really good out of dynamic driver like the HD6XX. There's a reason why Utopia has a bit of a shimmer at the highs for a dynamic. It's not a typical mylar or biocellulose, it's the stiff material type right? Beryllium HD6XX is an interesting headphone. It can sound a bit warm in the mids depending on the source. It can also sound more damped and naturally detailed there as well.