Synergistic Red Fuse ...

Reading the Magneplanar  1.7 information, the fuse is a 4 amp Fast Blow so do not  try these Fast Blow  fuses in an amp, preamp, or source.

These fuses are to protect the tweeter and so the RED fuse in this location did not make a difference for limniscale. Hopefully he can return them.

The Sennheiser 800 headphones last night sounded glorious. With the Synergistic Research Black and RED fuses in the headphone system, the soundstage certainly is not just an inside my head sensation. This system also takes advantage of the Synergistic Research A/C wall plugs and the Electronic Circuit Transducers (ECT).  The ECT's allowed me to reduce "glare" and really fine tune the qualities I wanted in my system. There is an excellent article (2014) in "Enjoy the Music" that compares several Audio grade A/C wall plugs.

I also like the fact that you can take the fuses and ECT's out of your system without difficulty.

David Pritchard

Davidpritchard,  my modified krell 700cx uses 4 fast blow fuses, so yes,  there is product out there that uses fast blow fuses in amplifier's.

I have replaced all of my AH Fuses with the SR-B (4), 2 in CD Player, 1 in Tube Power Supply and 1 in my Amp and all I can say is WOW! Just like everyone else has reported, more transparency without any brightness, Much deeper/wider soundstage with unbelievable imaging....

Every component I put these fuses in were drastic but the CD Player results were shocking!,. Listening to one of my favorite Classic Guitarist, Julian Bream, Giuliana Grand Overture, Op. 61 Sonata in C, Op. 15: Allegro from a 1969 recording. This is not an Audiophile recording and you can hear the flaws in the conversion to digital such as hisses and noise but with the SR-B, it's as if I upgraded the processor itself. The sound became much cleaner, smoother with a vast deep stage.

Try one to see if some of these attributes can be duplicated in your system.

Wig,

Glad to see your results replacing AH fuses with the SR-B. You convinced me to give the SR B a try since I too am using AH fuses which I thought were already a terrific upgrade over the stock fuses. I can't image my system sounding any better but it's worth the try. 

@lak and @oregonpapa 

I had them in my Maggie 1.7i's and tried them both directions.  I was using the stock fuses before.

My components are: 
Bifrost Multibit DAC
Odyssey Candela pre-amp
Odyssey Kismet in Stratos monoblocks