I’m very impressed with the SDFB. I’ve used many high-end fuses before, but most tend to alter the tonality, introduce noticeable midrange distortion, and result in bloated, loose bass. In contrast, the SDFB preserves the original tonality while significantly improving bass performance—offering greater detail, tighter control, and a clear reduction in distortion across the entire spectrum. The soundstage also expands substantially.

I briefly compared it directly with a fuse-less setup and can confirm that while there’s a slight reduction in body and bloom, the SDFB is the closest I’ve heard to running without a fuse.

Incredible micro-details far back deep in the soundstage are now noticeable and distinct. Like another deeper layer of the orchestra opened up. And those details aren't exaggerated or brought forward...they are textured, clear, but delicate and further away (as they should be).

And the first time my system has properly rendered a piccolo (playing a high note) without any shrill glare that would previously cause it to sound artificial.

Same with triangle strikes. Very clean, round with no harsh edge.

I got both Main Stream and Snubway at the same time, and you can check my review there for my comments.

The only comment I want to add here is that they work well together. In fact, I think they are both needed to acheive the maximum benefit.

They are as effective in lowering noise and revealing detail as the many I have tried in the past. However, they are making a little additional magic that no other plug-ins could provide. Music flows with ease and smoothness, but it is more than that. The PRaT was at its best playing from all my sources, and the music became more engaging. I also noticed the soundstage and instrument separation turned better and became more believable.

Killer combination with SDFB

These folks responded to my request for a lost part by sending me the entire product at no charge. In 60 plus years in audio that’s a first.
They also have surprised me again recently, but I’ll save those comments for a more appropriate time.

Easy to use. Price lower than expected. Sound quality better than expected. Great product for new audiophiles and senior citizens. I’m using it frequently.
Nobody asleep at the wheel on this product.

Vera-Fi Audio staff and owner are truly world-class - knowledgeable and kind! I can't ask for better experience. Thank you!!

As a late-comer to the fuse-upgrade culture, I'm glad that I finally stepped into the realm of SDFBs. I currently use a pair of Dutch and Dutch 8Cs sourced by Grimm Audio Mu2 as reference. I replaced all three fuses with SDFB and Graphene Sluggos. On my 8Cs, not only it opened up the soundstage, it did so without any sacrifice, the soundstage is more defined and the presentation is embodied with better clarity and even better focused - large orchestral passages become more layered, the tonality more visceral and congested sections more relaxed without sounding "loose". The additional graphene added to my Grimm Mu2 tightened the overall focus even more and further enhanced the overall realism of my system. This upgrade to me is fundamental and astounding. It ranked among the best upgrades that I'd ever experienced!

The single most effective "tweak"

Amazing, pretty much sums it up. Everything I’ve read about the SDFB, I found to me true in my 300 b amp.

This is my first Vera-Fi product. My system, except amp, runs through a 25# noise reduction Topaz transformer. The SnubWay still made a sonic improvement. There is a band of hash and grit in the lower highs that is greatly reduced. The system sounds so much more pleasant and relaxing.

This works so well, I purchased a 2nd SnubWay for the amp and a Main Stream for the complete system. Amazing improvement. The system now sounds the same day or night. I can listen for hours without fatigue. Highly recommended.

Didn't think the Main Stream would make a positive difference since I live in the boonies, with no neighbors. My home has a dedicated transformer on the utility pole. I was wrong. The Main Stream improved detail and the instruments have more color. Thankfully it doesn't decrease dynamics. Highly recommended.

The delivery was done a long time ago, but due to the internet line at home being down, I was only able to set it up and test it today. It’s truly impressive. It feels like the sound has come alive. I can’t believe how much of a difference this one thing can make.

Back in my audio years (70's 80's and 90's) no one talked about AC line filtering. We sold a "power conditioner" from Monster Cable but all it really did was compress the music! I don't think anyone really knew anything about what was on the AC line and how it affected a system's sound quality. But back then, customers balked when we suggested that they upgrade to a 12 gauge power cord for an extra $45!

I have auditioned a few of your competitor's products and while they did "something" none of them made as big a difference as your two filters. You have every right to be proud of your products as they really make a significant difference. I wish you every success in marketing your filters in a field that is crowded with voodoo clones some of which selling at stupidly high prices!