I'm with Andrea on the first one.
The Pro sounded richer to me, not just because of the extra bass.
It didn't sound muffeld at all to my ears, as Scott said. I guess I like the rich deep sound better.
But they where all good.

1. 9K Pro
2. Tyros
3. Exp. card

This is my final answer....

Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer