Aftermarket fuse to tame a bright system?

Gavin,

i had a similar issue a couple years ago.  I spoke with Chris at VH Audio and he was very helpful suggesting a HiFi Tuning fuse which was quite helpful.  
Best of luck!  A bright system can get very fatiguing!

It took me a while to realize that over damping a room with bass baffles and traps can sometimes boost treble. Duh!

@jjj666

"Ahem...changing the toe-in (or lack thereof) of your speakers can greatly impact treble. Give it a try before lightening the wallet with multi-colored unidirectional fuses."

Believe it or not, there is a very high probability that most people here have played with toe-in,,, extensively.

@jasonbourne71 Maybe fuses make no difference in your system.  In all of my friends systems and mine, fuses make a substantial difference.  With Acme treated fuses, always positive.  With SR fuses, it was a mixed bag (and now 10X more expensive).  I won't touch fuses where the manufacturer specifies not to or where boutique fuses require higher ratings to perform without blowing prematurely.  

I also have some equipment that is fuseless.  Your blanket assertion is wrong just as cabling makes no difference others have stated as fact.  

I use after 25 years of being a beta tester for a cable manufacturer, Blue Jeans Belden digital and XLR cabling pending auditioning higher end cables.  My friends are also changed to Blue Jeans Belden. Inexpensive but impressively neutral and full frequency/dynamic/open and dependably uniform.  Spend the money on the equipment first, then cabling.  As to fuses, $22/$24 Acme fuses are also a huge bargain, unless one's system can't resolve those differences.

@jasonbourne71 What does your audio system consist of and what acoustical/electrical environment is it used in?