Synergistic Research Master Fuses 5x20 & 6.3x32 mm

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Excl. TAX: € 536.36 Incl. TAX: € 649.00
Excl. TAX: € 536.36 Incl. TAX: € 649.00

Quick Overview

30 Day money-back guarantee

  • Absolutely World's best fuses!
  • Equally well suited for audio as for video
  • Ceramic body
  • Silica filled
  • Brass nickel plated contacts
  • 1,000,000 Volt Quantum Treatment
  • 2nd Stage Molecular realignment process
  • UEF Treatment
  • Graphene treated surface
  • Time-delay and fast acting available
  • Choice of all usual current ratings


The one fuse to rule them all

Master Fuse is an entirely new kind of fuse. In the past, Synergistic Research developed the highest resolution fuse given the current technology while voicing their fuses to complement a maximum number of systems. For over a decade, as newly developed technologies came online, like new UEF Compounds and new conditioning processes, they have applied them to the next generation of cutting-edge fuses, usually every two years. Of course, SR is striving for maximum resolution plus the warmth needed for most systems to sound musical. Never before Synergistic research was able to press resolution and other sonic traits as far as they have now.

Enter Master Fuse; the first Synergistic Research fuse developed expressly for full resolution, dynamics, soundstaging, speed, and impact without the need to create musicality as a system-wide fuse loom. Instead, SR engineered the Master Fuse to work alongside Purple and Orange fuses to create dramatic new levels of sonic realism, featuring wall-to-wall, floor-to-ceiling soundstaging with unparalleled resolution, dynamics and frequency extension.

Best of all, you don't need more than one or possibly two Master Fuses in your entire system with an otherwise complete loom of Purple and/or Orange fuses. So you start with a single Master Fuse on your DAC or line conditioner and realize guaranteed results or your money back for the first 30 days. You can then experiment sparingly with additional Master Fuses if you wish to go further. The choice is yours.

Note: If you are switching from an Orange or Purple fuse to a Master fuse, start by inserting the Master fuse in the same direction as the fuse being replaced. If the Master fuse is not an immediate improvement, flip it in the alternate direction.

Synergistic Research is so sure you’ll love what SR Fuses do for your system, a no questions asked, 30 day money-back guarantee is offered, so you can audition SR Fuses in your system risk-free. If you’re not 100 % satisfied with your system’s performance on SR Fuses, return the fuses to your dealer in like new condition for a full refund.

A/B recordings:

It is recommended to listen with your high-end headphones or download the hi-res audio files to listen through your audio system. In-home auditions are available from your Synergistic Research dealer.

Download to listen on your high resolution audio system:
Master Fuse in Berkeley DAC - Download
Purple Fuse in Berkeley DAC - Download

Frequently asked questions:

Q: Are Master Fuses directional?
A: Yes, all fuses are directional. Electricity should flow from the left to the right when you view the fuse. If you do not know the direction of flow you should listen to the fuse inserted in both directions. One direction will sound more detailed. This is the correct way.

Q: Do fuses have a burn-in period?
A: Yes, almost all products have a settling in period. The first 200-300 hours of use are the most crucial.

Q: Where should I use my Master Fuse(s)?
A: To get the most out of our Master Fuses, we suggest starting with one or two fuses in most systems, and possibly more for highly resolving systems. There is no "wrong" component to start with; however, we typically recommend starting "upstream" at the beginning of your signal source (music streamer, CD-player, turntable, reel to reel, etc.). From there, we suggest moving on to your digital-to-analog converter or phonostage (if you use one), followed by your preamplifier and then your power amplifier. If you have multiple sources, upgrading the fuse in your preamplifier first can improve the performance of all of your sources. Also your mains distribution (power strip, line conditioner or regenerator) will benefit a lot from a Master Fuse.
Soon, 10x38 mm fuses for in your domestic fusebox will be available!

Synergistic Research Master Fuse: a masterful accessory ✸✸✸✸✸ by John van Polen @
"Synergistic Research's Master Fuse is a breakthrough product in accessories for high end audio systems. Dedicated music lovers owning a precious system and demanding dynamic, refined and realistic reproduction of their music, really shortchange themselves by not trying the Master Fuse. With a few Master Fuses, you get a lot more out of your system; it's that simple."

Synergistic Research Master Fuse review; Take a leap of faith and trust your own ears by Rick Becker @
" I would be very hard-pressed to spend $595 in any other way to raise the sound quality of my rig into the realm of systems costing hundreds of thousands of dollars. Unlike TV commercials that promise to "save" you money on expensive commodities, the Master fuse may very well inhibit you from buying more expensive components once you realize the potential of what you already own. If it were not for my insatiable curiosity, I could call it an end game right now and get off the upgrade merry-go-round."
"If $595 seems like too much for you, I urge you to take a leap of faith and trust your own ears within your audio system. The 30 day money-back guarantee is there to protect you. Don't be afraid to use it if you're not satisfied. From what I've seen and heard since the pandemic, this should be the hottest product in high-end audio. May Thor throw lightning bolts at any vendor who uses Master fuses in their presentation without conspicuously declaring so. The Master fuse has put me closer to live music than any rig I've heard that didn't cost hundreds of thousands of dollars"

First impressions of Master Fuse by Mike Girardi (Senior Editor) @
“I have had all of the SR fuses over the years with each fuse delivering incremental improvements in sound quality but the Master Fuse is on a whole new level. Prior to testing the SR Master Fuse, my digital system consisting of several high end components were all fitted with SR Purple Fuses which has been money well spent to achieve optimal audio system performance. I don't believe in purchasing audiophile fuses for $5000 each based on their ultimate use as a consumable product but in a world of $5000 fuses, I found the SR Purple fuse to be a "practical" solution and ear opening endeavor as installed in my Ayon Audio S-5 Network Player/DAC/Preamp. After some break-in, the increase in soundstage separation and transient attack over the SR Purple Fuse was easy to discern. My system better resolved the attack and decay of strings, woodwind, and percussion instruments without added hardness. In fact, throughout the entire frequency range my system sounded clearer and smoother adding to the sonic realism. The liveliness when present in the recording was all there and present while being displayed faithfully to the recording source. For what a single Master Fuse does, it's well worth the price and was found complimenting the existing SR fuses in my system."

The Synergistic Master Fuse - Can a £600 mains fuse make a different? - Shocking News! by Chesireaudio

Customer Reviews

Customer Reviews

Fantastic product Review by Norbert
My system (Emitter II exclusive, Avantgarde Acoustic Primo, T + A MP 3100 HV) is fully tuned with SR products ( Power cell SX, Ground block Galileo SX, orange and purple fuses, GTCs and ECTs throughout the components, XOTs at the speakers and FEQ Carbon with Tuning Module)

Each tuning step down the road improved the sound of my system to a much higher level in total and I only can recommend to everybody who has a higher up system to go this way, when you rally what to hear what your system is capable of.

My last step was to install one Master Fuse in my T + A MP 3100. The streamer needs two (the second one is on its way) I am amazed what only this one fuse did to the sound already and the fuse is only one day in my system.
Every aspect of the sound ( clarity, details, dynamics, soundstage, bass, mid and high frequencies) got pushed to a totally different level and now really brings the maximum out of every single tuning step as well shows the full capabilities these high level components in my system have hidden so far.

The sound was never so crystal clear with soo much air around and absolutely nothing stands anymore between the speaker and you in your listening position.

It seems like this Master Fuse is just putting everything together and can only highly recommend to test one!
(Posted on 3/19/2023)
incredible performance! Review by Florian from Germany
…Master Fuse is answering almost every question…incredible performance! Currently performing in my El Mago… (Posted on 3/9/2023)

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