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HEXFRED's diodes — Do they brightnen the sound?

Posted by megalomaniac on May 23, 2010 at 11:35:58:
I am planning to replace the stock, general-purpose rectifier diodes of my power amp with FRED diodes (IXYS DSEI120-06A [gold-doped], chosen for its low voltage forward), but I have read some disconcerting reports from a few members of this forum in the sense that these diodes in reality add *edginess* to the sound, causing an imbalance between the mid/high frequencies and the bass frequencies.

How coud this be? According to the datasheets of these parts, they have *SOFT* recovery characteristics and lack of ringing, thus generating less RFI/EMI.

That being the case, I understand that they should have the opposite effect, a *lessening* of the glare, edginess and grit of the sound, that is.

Any comment about this?