Which SR Blue or black Fuse

So my SR Blue just arrived and I popped it into my amp's main IEC connector.  Straight out of the box it sounds a bit dark to me and the lows aren't quite as tight.  I will search the forum to see if others noticed this during the burn in period.  I know this fuse is directional so it's also possible I need to flip it around.  For the life of me I couldn't determine which way current flows through my connector (Note: I know current is supposed to flow from the S to the R printed on the fuse).  Any useful comments are welcome.

If you find the highs rolled off or recessed compared to how it used to sound, along with the lows being loose or phasey, just flip it and all should be good.

All the best,
Nonoise

You don’t have to know which way current or signal flows in the circuit since almost no aftermarket fuses are marked for directionality anyway. Thus, you should try both ways in any situation.

Flip it. One direction will clearly be superior.

Ok, I honestly can't believe what a difference flipping the fuse made.  Geez, seriously...that took me by surprise.  Thanks for the very quick and sage advice from @nonoise @geoffkait  and @david_ten .  You guys were all spot on!  The highs are back and detailed, the bass no longer loose, and the overall resolution of sound is so much more pure than using the stock fuse already.  My best descriptor would be a more realistic sound.  Grant Green's guitar sounds like it's being played out of my Mesa Boogie tube guitar amp and I could feel Ben Tucker's bass strings reverberate cleanly.  Was streaming Grant Green's "Green Street" MQA version as my reference for this fuse.  Impressed so far and appreciate your quick rescue guys.