I just replaced my SR Purple fuse with QSA Red in my Ferrum Oor+Hypsos headphone amp stack. Some preliminary impressions: Big increase in soundstage size and resolution. The sound is so pure it seems more like light and shadow than texture and solidity. Overall a very round signature, though also a bit analytical in the way it reveals all the layers and details. Seems to have a little bit of sheen and politeness. Extremely smooth and low ear fatigue.
Not as good: Doesn't seem to have the involving and energetic punch in the bass and midrange as SR, more restrained. Not as black of a background, or vibrant color. Some will miss the musical midrange signature of the Purple. I am hoping that all these things improve over the coming days. This first impression is after only a few minutes, so these have a way to go. Difference is obvious.
Not as good: Doesn't seem to have the involving and energetic punch in the bass and midrange as SR, more restrained. Not as black of a background, or vibrant color. Some will miss the musical midrange signature of the Purple. I am hoping that all these things improve over the coming days. This first impression is after only a few minutes, so these have a way to go. Difference is obvious.
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