Vera-Fi Audio LLC
Main Stream - Master Class Dynamic Parallel AC Line Conditioner
Main Stream - Master Class Dynamic Parallel AC Line Conditioner
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Product Description
Product Description
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Master Class Dynamic Parallel AC Line Conditioner
Main Stream is designed to improve the performance of your high-end audio or video system by reducing the amount of AC Mains-based interference travelling on the wires within your home. This interference is created not only by other components in the system, but also appliances and other electrical equipment elsewhere in the house. Sometimes even emanating from outside your home!
Of course, this interference is mostly in the RF range, but things like refrigerators, air conditioners and heaters, washers and dryers; anything with a big motor and put a pulse of energy onty your home AC line and it will be "felt" by other equipment within the home. The energy imposed on the line is absorbed or filtered in different ways, depending on the frequency band involved. Part of Mainstream's effectiveness is due to the multiple frequency bands it effects while utilizing a simple topology comprising a minimum number of parts.
Line interference can cause many undesirable effects; hum, hiss, hash, or buzzing sounds from your speakers, a slight vibration that can be felt through the chassis of your components or on the motor of your turntable, and on video displays as random lines, moving bars or fuzzy images.
These effects can be experienced individually or in combinations. It is interesting to note that oftentimes the effect (hum, for instance) is apparently reduced, but our bands of interest do not include these very low frequencies. We are reducing energy in a band that infers these types of noise reductions.
Main Stream is called a “parallel” line conditioner because you do not plug your component INTO it, but rather plug it into the Mains socket closest to the component. In this way the MainStream is never restricting the flow of current to your components, simply removing the interference it encounters on the line as the current flows by. And there is no limit to how many MainStreams you can use; a large system may best be served by several.
As you probably know, the other type of line conditioning is called "series". There are many (maybe most?) products out there which plug into the wall and then your component(s) plug into it. With these, the current must pass through the various filter parts on their way to your audio component, necessitating the internal parts being of both high enough voltage and current to support the power demands of the attached product(s). This makes these conditioners both larger and more expensive than a parallel type, and they are often designed to serve somewhat different needs, or sometimes one of just distribution and surge protection.
Mainstream uses a combination of reactive elements to create tuned filters designed to specifically reduce the levels of noise specifically known to interfere with your audio enjoyment. Our topology excludes the use of any type of resonant transformer as a wave shaping device, and rather only removes unwanted frequencies.
• Capable of reducing system background noise to vanishingly low levels.
• Reasonably priced,
• Milled extruded aluminum case
• Designed for a long life of continuous service
• A faint blue glow shows it is working
• Laboratory tests prove the effectiveness of MainStream via Fast Fourier Transform graphs





Main Stream Reviews on YouTube

Audio Pursuit
Audio Pursuit gives Main Stream the Tesla award alongside SnubWay

TONE Audio
Vera-Fi Main Stream Quick Overview

Audio Pursuit
Budget-Friendly Power Conditioners: Snubway & Main Stream
Articles about Main Stream

Positive Feedback
Tom Gibbs awards Main Stream and SnubWay for 2024 Writers' Choice Award

Headphone Guru
Main Stream wins 2024 Accessory of the Year awarded by Headphone Guru

Positive Feedback
Main Stream provide the kind of overall improvements you'd expect to pay through the nose for.

Tone Publications
The Main Stream will make a similar contribution to your system just like fine-tuning your speakers for optimum placement and turntable setup.

Stereo Times
The Main Stream brought me ever closer to the music while providing a more nuanced performance.

Headphone Guru
The Main Stream is an incredible value and an extremely simple way to improve your audio system without introducing any negative effects.

Audiogon Forums
I can’t think of any other product that improves recorded music as dramatically as Main Stream.

Positive Feedback
Main Stream has worked wonders in my all-analog system.
Frequently Asked Questions (FAQs)
What does the Main Stream Master Class Dynamic Parallel AC Line Conditioner do?
The Main Stream reduces a broad spectrum of AC noise, allowing your system to achieve ultimate performance.
How is the Main Stream different from other power conditioners?
The Main Stream is a plug-in filter that increases the blackness of one's audio system, enhancing sound quality without introducing any negative effects. It concentrates its effects mostly between 10kHz and 20kHz where problems with AC Mains tend to show themselves.
Is the Main Stream easy to install?
Yes, simply plug the Main Stream into an outlet on the same circuit as your audio equipment. Main Stream is fine in Power Conditioners as well. Main Stream is also a parallel type filter so can be plugged into any available free power socket in your system.
Can I use the Main Stream with other power conditioning devices?
Yes, it can be used alongside other power conditioning devices like SnubWay or other products like Puron etc.
What kind of improvements can I expect in my audio system?
Experts and users have reported a darker background, revealing more detail and ambient cues, expanded soundstage, and tighter, deeper bass.
Where can I find Vera-Fi Audio warranty information?
You may find information about warranty here.
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The Caldera 10s blend nicely with my Wharfedale EVO4.2s (big bookshelf speakers). The 10s were initially a little boomy in my small room, but blocking the vents yields pleasingly crisp bass. I plugged my integrated amp & the 10s into a "smart power strip" - so that switching on the amplifier energizes the outlets for the 10s. I'm really pleased with my purchase, and I'm relistening to my whole collection to hear the improvement.

I have 2 Caldera 12 subs. My wife think they look great and I love the sound of them. They blend so seamlessly with my Spatial Audio open baffle speakers. My only issue is with the auto on/ off…. It cuts off too quickly when no signal is present while the music is playing and then it cuts back on when signal is present while the music is playing… the problem is the switching on/off is audible. It distracts from the illusion of musicians playing in front of me. Of course I just leave them on now for a work around. Other than that it is a great piece of equipment that I am proud to own… to say nothing of its price/ value and quality. It sets it apart from a lot of budget subs and on par with the best
我的系统有两条HIFI专线:
A线路:Aurender N150,Innuos Phoenix USB Reclocker,精音DAC-D1000 MK2(R2R)。
B线路:小不点LD-Y3全平衡300B胆机耳放。
从国外论坛中了解到Vera-Fi Audio的SnubWay和Main Stream这两款降噪新品后,我联系了Mark。在30天免费退货的条件下,我尝试了这两款产品。此前我用过日本Furutech NCF Clear Line电源净化器和美国Shunyata Research Venom Defender电源优化调谐器,但效果不够明显,也不够理想。按照Mark的指示,并联设备需要通电400小时才能达到最佳状态,目前我的通电时间已接近400小时。
由于SnubWay和Main Stream体积较大(三角形设计),如果和电源线一起插入美标插座,空间不够,所以我自制了几条公母转接线来搭配。我将SnubWay(2个)和Main Stream(1个)放置在以下位置:
SnubWay #1:插入A线路的Sierra 20A镀金背插座,通过Hubbell橡胶插头转接线与CARDAS Clear Power电源线并联,供电给Aurender N150数播。
SnubWay #2:插入B线路的A&H-H 6262-2 DELUXE电木插座,通过电木插头转接线接入,与A.R.T. AC-8 G1电源线并联,供电给小不点LD-Y3耳放。
Main Stream:插入B线路的Hubbell 9595 + HUBBELL BK-12433总墙插。
听感上的变化:
加入这三个并联降噪设备后,我试听了熟悉的曲目,包括交响乐(如马勒《第二交响曲》)、人声(如蔡琴《渡口》)和爵士(如Dave Brubeck《Take Five》)。整体听感提升明显,背景黑度更深,细节更清晰。以下是具体变化:
背景黑度更深,细节更清晰
在A线路加入SnubWay #1后,数播端的背景噪声明显减少。播放《渡口》时,蔡琴的呼吸声和低频鼓点之间的空隙感更强,细节浮现得更为自然。以前偶尔能察觉到的微弱“沙沙”声几乎完全消失,背景变得像“墨汁般黑”,让人更专注于音乐本身。
声场扩展,3D感增强
Main Stream在B线路的加入对声场影响显著。听《第二交响曲》时,乐团的纵深感和定位更立体,弦乐组与铜管组层次分明,仿佛能感受到乐手之间的距离。相比之前,声场宽度和深度都扩展了不少,3D包围感让人有种“置身现场”的沉浸感。
低频下潜更深,纹理更丰富
SnubWay #2和Main Stream在B线路的协同作用,让耳放的低频表现更上一层楼。《Take Five》的鼓点下潜更深,力度感更强,同时低频的纹理和扩散感也更自然,不再有那种“糊在一起”的感觉。尤其是Main Stream加入后,过滤了家电电机噪声,低频的氛围感更浓厚,整体听起来更松弛有力。
人声情感更细腻,动态更宽松
人声方面,《渡口》中蔡琴的声音轮廓更清晰,情感的起伏和喉韵细节被放大,显得更有温度和感染力。动态范围也有提升,弱音到强音的过渡更顺畅自然,没有之前那种轻微的“压迫感”,乐感变得更抓耳。
整体氛围感和乐感提升
三者搭配后,系统整体的氛围感明显增强,音乐不再只是“精准还原”,而是多了一份活生生的生命力。无论是大编制的恢弘,还是小编制的情绪流淌,都让人更容易沉浸其中,长时间聆听也不觉得疲惫。
Vera-Fi Audio的SnubWay和Main Stream作为并联降噪设备,在我的系统中发挥了“锦上添花”的作用。SnubWay的高频噪声过滤能力让前端和放大环节的背景更干净,而Main Stream在低频和动态上带来了惊喜,两者协同工作将系统的潜力进一步挖掘出来。这三件“手雷”性价比很高,绝对是“调音利器”。
在使用这三个设备的过程中,Mark非常热情,有问必答,让我感到很亲切。我愿意尝试更多Vera-Fi Audio的产品,Mark很专业,同时也要感谢Mark的同事Peter。有时候对于Hi-Fi玩家来说,有些东西看似玄学,但其实背后有更多科学技术的支撑。Vera-Fi Audio的产品物有所值!

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.

Having already experimented with a range of aftermarket fuses in my system, including the AM Ultimate Premier, AM M1, SR Orange, SR Purple, SR Pink, SR Master, Hifi-Tuning, and Gustard, I have developed a particular fondness for the SR Purple, Pink, and Master fuses, owning multiple units of each. After encountering several positive reviews about the SDFB, I decided to try it paired with the Graphene Sluggo in my Lampizator TRP II DAC.
The Lampizator TRP II is highly responsive to tuning components, making it an ideal candidate for the SDFB. The results were nothing short of remarkable. The soundstage expanded, the dynamics of the music became even more pronounced, and the spatial depth of the audio improved significantly. Additionally, all frequencies seemed to receive a more balanced enhancement. It was as though the SDFB took an already exceptional-sounding system and elevated it across every dimension.
Impressed with the performance, I immediately ordered additional SDFBs. In summary, the SDFB is an outstanding tuning component that delivers impressive results at a very reasonable price, making it a highly recommended upgrade for any audiophile seeking to refine their system.
Cheerz over the pond
Usé

I have 2x Snubway + 2x Mainstream plugs connected to my Ansuz power distributor. My system never sounded better!
I was initially skeptical, but there are really safely amazing to use...even in very high-end systems.

The first 30 hours I heard the potential but the tone seemed off. Now about 60 hours in I am totally blown away! The biggest improvement is the soundstage and imaging. The SDFB on my amp has freed the music from my speakers. It is just there, in front of you. The speakers disappear (hard to do with 5 foot tall, 2 feet wide Acoustats). The depth is incredible! The background is quiet and black, details just jump out of the mix. Amp seems more powerful, more dynamic.
I still think it would be even better without having to use another separate power cord, and I intend to try to use adapters with the SDFB to compare against the Piggy. But the Extreme Piggy is very good.
This is one of 5he best tweaks I have tried. Highly recommended!

These stands are much more substantial than my previous pangea stands.. and use 4 metal posts instead of the pangeas 3 that were smaller in diameter. The top plate is also much bigger, which I really appreciate. My speakers perfectly fit on the top plate like they were designed for each other! Speakers are selah voce, pictured here https://ibb.co/vS5znHV

Started with a SAFB on a PP Audio P5. It seemed logical that the fuse was a bottle neck for power flow. It another high-end system, the manufacturer uses breakers, not fuses. I heard an immediate improvement. I now own eight of them, removing one SR Master fuse and other SR fuses.
I installed graphene slugos in the PS Audio DAC mk. 2 and the BAT VK-80. Through dedicated 20 amp line, I am driving 1000 watts per channel into PS Audio FR-20 speakers. SAFBs made a profound impact. This is an end game system now. Said it before but this time it is a commitment. Last dollars spent.
I didn't use the small spikes that came with the product, since I used mine in front of my PureAudioProject speakers.
Effective decoupling, thanks to the damping system under each VBH, a kind of rubber ring that stabilizes perfectly.