@Vtory The only drivers that stand out as substantially 'different' sounding beyond unit variation is the brass ring OG HD580 / Early HD600 drivers which seem to have better bass distortion but also are hotter 3k and up. Still a minor difference though. That said haven't been able to control the brass ring drivers quite as well in the highs to suit my preference. Always tweaking...
600 vs 650 driver - 650 driver basically tilted downward 1 degree of slope. I don't think the dynamic nuance or staging ability is meaningfully different.
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