In all honesty no, not yet. it's the same deep weighty bass from open box. The night is still young though! only 1/3 way through their service period. I had them plugged into my computer on first day through E10, I found the treble a little stabby, so I lowered eq to sufficent levels. Then today, (four days later) after some burning the settings were still saved in my EQ I plugged them and could notice it straight away having to adjust them higher a touch!
I'm not doing 300 hours, I'll meet them just over half way with 200, then let listening do the rest!
Listening Source: Sansa Clip+ + Fiio L8 + Fiio E11 !
And as ljokerl said in his GRO7 review: What a glorious sound it is!
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