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Here are few quotes about upgrading fuses in net

“ The upgrade  fuses are expensive for a device of this type, and many of you will completely reject the idea that

1) fuses make any audible difference, and

2) fuses should cost more than the change in your pockets. Ignorance is bliss, as the saying goes. But if you want the best performance from the amazing loudspeaker, and others in today's high performance speakers, there is no other option. I suggest that it is mandatory to use the fuses on the Loudspeaker.

At the price each, these fuses are not only cost-effective, they are a bargain. A similar upgrade in the performance level of a preamplifier, for example, would cost several thousand dollars. Come ON, from a FUSE?! “

“ Uses Beeswax instead of the normal anti vibration fluid, this gives the fuse a very organic flavor but maintains the detail, dynamics. The production of this fuse is very difficult, very hard to get the Beeswax into the fuse but the organic sound is too good to ignore.

anti vibration fluid to stop the element from vibrating at 50/60 hz and then the blackout powder super mix to absorb all EMI and RFI riding the element as well as ambient sources and insert a new HRC core which allows the signal to travel through the fuse in a more cohesive and linear manner. “

“ Much more detail top to bottom, wider and deeper soundstage, much better inner detail, layering, and a lot more air around instruments and voices. “

“ I replaced the stock inlet fuses on my amp, CD players with the appropriately rated Upgraded fuse. Some believe higher performance is possible by using a fuse rated higher than the stock one. I chose not to do this strictly for safety reasons. Those fuses and their current ratings are there for a reason and discretion is the better part of valor. If you disregard this, you could void more than just a warranty.

I swapped the Amps fuse first and upon powering up, I noted the difference right away, even from a cold start. I noted slightly greater transparency and less hash and grain, not unlike a decent power cable. On my CD players, the effect was inconclusive. I did not notice an improvement let alone a difference in either player. Perhaps they needed a little break-in time? I left the fuses in my equipment for a couple weeks before swapping them out with my original fuses. Whoa. Now it was obvious that the Upgraded  fuses had a significant impact on my system's performance. Via the CD players, I observed less grain and hash, greater transparency, a little more detail and a slightly more open soundstage. The effect was not unlike swapping in a set of decent power cables or inserting modest power conditioning. Frankly, my system sounded far less satisfying with the stock fuses compared to after it was Upgraded Fuses. I also inserted the fuses in the opposite direction and in all instances, noted increased glare and brightness. As I said earlier, you can easily determine the proper orientation by ear. That may be a good idea if you are uncomfortable working with electricity.

While spending more money for a fuse might seem ridiculous, when you hear what these gilded fuses do, you will consider this an outright steal. Most tweaks do make an audible difference but in many cases, not necessarily an improvement. With the Upgraded  fuses, you definitely will observe enhanced performance. Highly recommended. Just be careful and don't barbeque yourself. “

“ If you think power cords also don't affect sound, then replacement fuses are not for you. 'regular' fuses are often poorly made and contain a surprising number of parts along with the fuse wire. They are made by a machine and don't always fit together well.

The best fuses like the best outlets and caps address resonance control. Upgraded Fuses has some fuses that they fill will a liquid compound that addresses resonance as well as EMI/RFI.i have one in my Amp  (main power fuse) and it does sound better than my other upgraded fuse.

Same is the condition when audiophiles discuss about cables, more specifically about power cables (speaker cables and interconnects fall in a different discussion). “

“ For years I've wondered when a product like this would come along.

It seems like almost everything in our music system's electrical path has an audiophile alternative that improves performance. Everything, that is, except a component's fuse—and now Upgraded fuses has resolved that problem.

When I began experimenting with power cords in the early 80's, many people dismissed aftermarket "audiophile" power cords as snake oil. The usual comment was usually something along the lines of, "With all that wire inside the wall, a high quality cord on the other side of the socket can't possibly matter." Well, as it turns out it does matter, and for the most part audiophiles don't argue about that anymore. In the years since, high end cable manufacturers have improved this technology to the degree that it's almost a moot point, even to those who don't want to believe. The debate now is more likely price versus value rather than "if" power cords matter.

A few years ago I upgraded all of my electrical outlets, stimulated by the stunning improvement the complete rewiring of my listening room provided. Everything was replaced, from the electric service provider's transformer all the way through to each individual piece of audio equipment. The job required two new breaker panels, a new service drop and fourteen dedicated circuits. It seemed a bit radical at the time, but to this day replacing all that electrical gear remains the single most cost-effective upgrade in all my years in audio.

So, not surprisingly, I was attracted to the idea of banishing one of the few remaining obstacles in my systems electrical pathway, the fuse. Everyone is familiar with the old saying "A chain is only as strong as its weakest link," and that certainly applies here. It's simple when you think about it: electricity flows though your breaker box and in-wall wiring to each electrical outlet. From there electricity is directed through our spiffy, audiophile grade power cords into our mega buck audio gear where it hits the fifty-cent "safety valve," known as the fuse.

The ideal electrical path would be a quality piece of appropriately sized wire rather than the fuse. Unfortunately, a piece of wire in place of the fuse puts life and limb at risk, not to mention the hazard of burning down your house and destroying all your possessions. Since this safety valve is a requirement, choosing a fuse that preserves the integrity of the electrical circuit as perfectly as possible, without sacrificing safety, is the only high-performance alternative.

On the surface, this is a simple concept. In reality, the requirements to design for high performance, while at the same time maintaining the standards set forth by UL, CE and other electrical watchdogs, make this job difficult. Upgraded  fuses not only meet these codes, they provide an immediate and significant upgrade. All that's required of the user is matching ratings for the specific piece of equipment you wish to upgrade.

Upgraded fuses are precision products; this was evident from the moment I cut away the plastic seal and held it up to the light. I was struck by the jewel-like slow blow element; viewing was easy as the glass housing is exceptionally clean and clear, and, of course, the ends are gold plated.

I ordered eight Upgraded  fuses to replace the stock fuses in the outboard power supplies of both my AMP and CD player. For these products the replacement fuse is 2 amp and 31.8 MM in length. The Amp was designed for slow blow, making this upgrade easy. Upgraded fuses are available ONLY in slow blow

How do they sound?

In my system, the change from stock fuses to Upgraded fuses was absolutely positive. The upgraded fuse mostly reduced distortion and grunge while tightening up imaging and improving the sense of placement. This kind of upgrade is so right that you accept the change as part of the music within a few minutes. It's very much like the benefit offered by a fine aftermarket power cord, but in miniature. 

In my listening evaluation, the upgraded fuses were installed into the holders on the back panel of each Amp power supply. The Improvement was obvious from the moment the system was turned on. Better still, everything continued to improve for several days as the fuses settled in.

There is something I should point out here about installing Upgrad  fuses. Each fuse is marked with an arrow, indicating the direction the current should flow. Take care to not reverse these, as it harms the sound.

After a few weeks of enjoying this upgrade, I turned off the system, removed the fuses and dabbed a thin coating of Contact Enhancer over the caps of each fuse, and reinstalled them. This provided an additional benefit, increasing my respect for both of these fine products.

In fact, my only issue (ever) with upgrade fuses was the price, but while writing this review I began to think about my previous preamp, which served me for more than five years before I replaced it. All during that time there were no fuse failures, and had upgraden fuses been available back then, I could have enjoyed five years of improved sound and my original money buy fuses investment would still be intact. That's a lot of improvement amortized over the years—unless you blow a lot of fuses!

In fact, I plan on trying more of these in my system and recommend them to anyone who wants improved system performance with no downside. There's no downside? Well, that's pretty hard to say for sure about any product, especially in high end audio. I can say that I can't think of any. For my money, this product qualifies as an instant audiophile gratification upgrade, and gets my highest recommendation. “