Main Stream - Master Class Dynamic Parallel AC Line Conditioner

So…
I plugged the Mainstream and Subway, sat and, well nothing! No change at all. A little disappointed to say the least. And then, literally a couple minutes later it began and increased over the rest of the evening. By the end of the week I was astounded and promptly ordered two more! Improvements across the board, most noticeable was a greater musicality, richness and body to the music. More natural, less harsh or forced.
When the second set arrived it was the same thing. With two pairs in my system now, it’s a component level change. Once of the best improvements for the costs ever. Thank you

After integrating both the SnubWay and Main Stream into my system for an extended period, I can confidently say they have become indispensable components in my setup. From the very beginning, the improvements in low-frequency articulation and control were immediately apparent. The bass not only gained in weight and presence but also exhibited a remarkable refinement, offering better layering and definition without overwhelming the rest of the spectrum.

The SnubWay contributes by subtly reducing background noise, allowing micro-details and textural nuances to surface more effortlessly. Meanwhile, the Main Stream enhances the power delivery with a natural, unforced energy, resulting in an organic flow to the music that feels both more vivid and coherent.

What impresses me most is the way these two devices elevate the emotional engagement of listening sessions. The system now breathes more easily, with a blacker background, sharper imaging, and a more lifelike presentation across genres—from classical orchestration to complex jazz ensembles.

It is rare to encounter accessories that make such a profound impact without altering the core character of the system. I am truly grateful to Mark for offering these outstanding products, which have taken my system's performance to a new level of musical realism and immersion.

That's nothing to be said. Fantastic products and still purchase more.

Howard.

WOW! 💥 I added the Main Stream unit first. After a good amount of break-in time, I started hearing the backgrounds in the music sound quieter. Instruments are a bit more focused in their own space. A subtle but noticeable improvement overall. Now I decided to try out the SnubWay. 48 hours in, no real change in things. Fast forward to about 500 hours of being in my stereo system (with the MainStream still in place) and I cannot believe what I am hearing! I have a much bigger soundstage right-to-left and the same for depth front-to-back. There's a greater separation of instruments & voices and yet there's more layering and detail in between. Anyone who cares about their music and optimizing the way your stereo sounds needs to contact Mark L. Schifter at Vera-Fi Audio. Of course, YMMV in your system. Tell Mark that I sent you!

I have had the Snubway and Main Stream plugged in my system for about 2 weeks days now. On the first day I was not blown away by what I was hearing. I did notice some improvement in clarity and reduction in noise floor, but it kind of left me feeling underwhelmed.

Fast forward to three days later and when I sat down to listen I was like "Wow". Something had changed for the better - by a lot. I was now hearing much more clarity and the reduced noise floor allowed me to hear more low level detail in recordings. I noticed for the first time room ambience in some jazz recordings that I had not picked up on before and the music overall seemed to reach out and pull me in more than it had previously.

I tried various positions for the devices and for now have settled on the Snubway being in the duplex outlet that my power conditioner is plugged into and having the Main Stream plugged into the first outlet on my power conditioner. This configuration was recommended by Vera-fi and seemed to work best for me. When I removed either one of the devices the result was less than when using both.

Mark from Vera-Fi was very helpful with any questions I had. Highly recommended to try.

In a nut shell: Snubway and Mainstream combination has cleaned my audio as much the best painting with excellent details and texture covered with dust for years comes to life when the dust is cleaned. Picture hasn't changed, its the appearance that is now more appealing. Just this way these devices makes music pop up.

I wouldn't give what has improved on which of the track, because every track sounded awesome, very detailed to me. I don't want to leave it to your imagination rather wanted you to experience it.

While some may consider the effect to being bright due to increased resolution, but truly that is how probably your system with good power supposed to sound.

There may be several other products with similar offerings and if you have time to experiment, fine try your best fit, otherwise these are real stuff at a very affordable price. And if you are a person like me, would spend time enjoying the music then think no further, just add Snubway and Mainstream. Mostly you will not regret with your decision.

I would say buy it, plug it, sit back and relax for a week and then thank yourself for the decision to buy it otherwise avail the 30 day money back guarantee. Whatever don't decide to unplug it without running atleast for 100+ hours, 10 days to the best.

Detailed review:
Friends if you have time read thru the entire review to get a feel of my experience.

I am a real person, an audiophile, paid purchaser of the products, not a reviewer paid or affiliated to any publication nor have any affiliation with the product(s) or the company nor here to influence your decision.

My setup has power conditioner (Synergistic Research Powercell SX) and multiple power enhancers (from High Fidelity cables, Add-Powr Sorcer 4 and Synergistic Research various products) including the well acclaimed power cords (Synergistic Research SRX and Galileo) that are supposed to eliminate noise. Absolutely no product using SMPS, only LPS from Sean Jacob and Farad even on network devices including modem, router and all network switches in the chain. All external PSUs use Core power technologies Diamond xtreme power cords. And most importantly the entire audio network is on a seperate circuit with 30A breaker on its own. I was very happy with my setup.

In my interactions Mark recommended to try Snubway. I mentioned to him I already have several power enhancers in my setup and will these really add or do anything different. Mark very confidently responded, based on what his customers experiences was it will, give it a try. I very reluctantly ordered to give it a try, not because they are expensive but because of the efforts and time involved to spend on it.

Here's the summary of my experience:
Upon plugging Snubway and Mainstream to the main power receptacle that feeds the entire system, I heard something different happening.

At first the change I heard was in the lower frequencies, which was also my observation with most other products that are made of pure copper. The experience was OK as it isn't the final state, results can go either side after few hours of listening. The best part even at this stage is nothing is added or removed, I could enjoy music as before.

Day 2 (after 30hrs+), I haven't heard what my experience has been the first few hours of plugging in. Music seems to be sounding more closer to how it was before adding these devices, but a little more details poping out from a very far off distance. Day 3 thru 5 (36hrs to 100hrs), gradual improvement especially tigher bass compared to the previous days as well as details popping out closer as it aged connected and powered. I don't shut my audio equipment, leave them on always except when away for more than a day or bad weather conditions.

I usually play audio at moderately higher volumes especially when recordings are too good and wanted to enjoy every detail. At about 100hrs+ of use, due to an unavoidable situation I had to play music at considerably lower volume, almost 2-3db down from my normal listening volumes all that day. Interestingly, in my listenings that day I never felt a need to raise volume even for those existing moments. Every detail popped up crystal clear, just like how a painting would show cleaning dust from it. Imagining and soundstage from my original audio equipment is unaltered, just the stress is relieved.

As days passed it just added more excitement forcing me to listen again every track I previously enjoyed. At this stage I decide to go back to earlier setup, so, unplugged both Snubway and Mainstream from the chain. I could hear the difference immediately, but this time felt it a bit dull.

Not being sure, to double verify whether it is a placebo effect or real, plugged Snubway and Mainstream into my multi-channel HT. My HT setup too is equally powered with power conditioner, enhancers and power cords similar to audio setup. Surprisingly, same impact on audio there too and interestingly video improved to a gr...

今天对 MainStream的位置进行了AB交换比较：
从数字播放线路（数播、解码、usb重组）的总墙插 挪到 耳放线路总墙插后，与SnubWay#2 搭档（同样数字播放线路也有 SnubWay#1设备），效果还真有点让人惊喜。
低频明显沉得更深了，不是那种轰头的胀感，而是扎实又有层次的下潜，听着挺舒服。动态也更有活力，声音的力度和起伏都更清晰，尤其是听大编制或者鼓点强的曲子，能感觉到那种冲劲。
空间感也开了不少，声音不再闷在一起，定位清楚了点，空气感也好了一些。
刚换上去一耳朵就能听出差别，虽然不是翻天覆地的变化，但这种细腻的提升真挺抓耳的。降噪做得也稳，背景干净了，低频和氛围感都有加分。

对喜欢低频质感和宽松听感的玩家来说，这俩组合还挺值得一试，性价比挺有吸引力。MainSream在我的系统中更适合耳机放大线路。

I have bought the Mainstream AC conditioner and the Snubway as well a few weeks ago. I can say that I was a little sceptical because I have a very high revealing system ,so how much better can it get? Well the first 150 hours were very subtle in audible differences but something was going on as I was starting to feel the music differently.The week after, I started to play some vinyls and WOW! I was so excited that I had to write to Mark to tell him he’s got 2 great products.The music sounded more live and detailed with a great soundstage pinpointing the instruments a notch above before. I need to mention a thank you to Mark, a real gentleman. He will answer any questions you may have regarding any issues you may have.I recommend both products as they complement each other.Thanks again to Mark and can’t wait for his next winner.

Excellent product yielding much better results than expected. Especially when paired with a Snubway noise defender. I am definitely considering another pair in the near future.

I addded this to my system that already had the Swiss Digital FuseBox with an and a SnubWay, and I was already super happy with, then I saw Mark had said the Main Stream and SnubWay work great together and as usual he was right!

The MainStream added another level to the complete absence of interference with my digital gear and creates absolute inky blackness with added clarity.

Thanks for another great product Mark!