LessLoss Firewall 640x, Stellar version pulls reviewer inward, enveloping him in its encompassing majesty
Happy New Year to All!
LessLoss now has received our 706th review, this time of the LessLoss Firewall 640x, Stellar version, published in HiFi Knights.
Published January, 2026, author Dawid Grzyb describes his personal impressions using this innovative technology. Here is some of what he had to say:
"...most refined take yet on passive power conditioning..."
"...sits prominently within the catalog as the most advanced"
"In hand, the device—finished in a satin sheen—unmistakably feels like a costly, premium object."
"bass extends deeper, gains speed, substance, and authority, becoming more anchored, defined, composed, powerful, elastic, and dynamically eager."
"hollowness or boominess that reinforces room chatter is noticeably reduced."
"Vocals shed excess edginess and grain, gaining color, density, smoothness, and articulation"
"The backdrop grows darker, cleaner, more engaging, and richer in nuanced detail"
"The soundstage expands, develops additional layers, and increases in complexity, while all images remain in focus, expressive, and contrasting."
"profoundly effective"
"hardly subtle"
"With it on the job, some aspects I’m about to explain were very well pronounced. Without it, they were either greatly reduced or missing, so the entire musical intake felt different—far less engaging and pleasing to me."
"it made a demonstrable difference without any second thoughts"
"With the Firewall 640x Stellar engaged, each image gained additional heft, moisture, and smoothness."
"every instrument—and even the finest dust particles suspended in space—felt more sensual, organic, and alive."
"While the track accrued atmosphere, anchoring, substance, and fleshiness, it paradoxically became more intelligible"
"The Firewall 640x Stellar infused each note with deliberation and substance without sacrificing clarity, a balance I found deeply compelling."
"revealed just how accomplished it is in the realms of dynamic span, authority, elasticity, and sheer rhythmic flow. With the LessLoss engaged, the presentation grew larger, quicker, more punctual, immediate, immersive—and ruthlessly precise in landing each bass jab without a trace of fuzz or bloat. Remove it, and the same track turned lighter, more mechanical, tonally flatter, anemic, and markedly less elastic, as though its funkiest instincts had been quietly siphoned off."
"The list of improvements was extensive: deeper low-bass reach with markedly superior control, impact, focus, and articulation; more precisely defined images surrounded by more tangible breathing space; higher contrast and an increased sense of effortlessness; and a vocal presentation that was not only clearer and more textured, but also blessedly free of the nasal, prickly edge it can otherwise exhibit. Despite the added gravitas—meat on the bones, if you will—and a more atmospheric, earthy tonal balance, the result remained highly resolving."
"With the LessLoss positioned ahead of my DAC, the entire soundscape seemed to pull me inward, enveloping me in its encompassing majesty, eerie allure, and elegiac sadness—meditative, almost spiritual in nature. The moment the filter was disengaged, that deeply personal connection vanished."
"This device elicited an emotional response that felt both genuine and profound, elevating the experience to an entirely different plane."
"The Firewall 640x doesn’t merely shine—it radiates. I found it remarkably potent, and frankly amused by how much it managed to extract from a system whose power delivery already felt dialed in to a degree most listeners would never pursue."
"That, ultimately, is its true appeal. If you’re running a fully sorted, high-end platform yet remain open to radical measures to push it further, the LessLoss Firewall 640x Stellar may be precisely the reminder—delivered in no uncertain terms—of just how much more your system can still give, even when you believed you had reached the limit."
You can read the entire review on Hifi Knights
Learn more about this innovative and highly effective product right here on our Firewall 640x, Stellar version product page.
Firewall 640x Stellar version availability and launch
Our initial production run sold out very quickly. Thank you to everyone who supports our latest product development.
We are currently awaiting the availability of a rare part necessary for production of the Stellar Firewall 640x. Our parts supplier is in the process of re-tooling their facility with high tech equipment, and until this new equipment is installed and fine tuned to ensure their new production specification, aimed to be even better than before, we will have to continue to wait. We have tried all manner of alternative parts but none come close to matching the performance we have already achieved.
Thank you for your patience while we ourselves await the availability of the new part.
What you can do instead
We would like to extend to you this special offer. To anyone who purchases either the Firewall 640x regular version or the C-MARC Firewall 640x, between now and the moment we'll again be in stock of the new Stellar version, we'd like to offer 75% credit when you choose to upgrade to the Stellar when again available.
Some upgrade pricing examples
For instance, if between now and when the Stellar is again available you purchase a C-MARC Firewall 640x, you will later be able to turn it in and purchase the Stellar for only 1972 - (1272*0.75) = 1018 USD. This way you can still enjoy the magnificent performance upgrade the LessLoss Firewall technology has to offer even today! And if between now and when the Stellar is again available you purchase three C-MARC Firewall 640x units, you will later be able to turn them in and purchase the Stellar for only 1775 - (1272*0.75) = 821 USD each! These are pre-tax prices which differ somewhat in different parts of the world.
We keep it simple
Don't forget, our prices are always shipping included, even if your upgrade order calls for two shipping legs (from us to you and from you to us). We always pay the shipping and there are no hidden fees. We even provide you with all necessary packing materials, so you don't even eed to leave home. It's as simple as calling up your local UPS and telling them you need parcel picked up and shipped off. UPS and LessLoss take care of the rest.
Where to purchase
You can purchase the Firewall 640x for power right here. We will definitely help to make it very easy for you to upgrade to the Stellar in the future. Just drop as a note by email once you see the announcement! We'll be happy to serve you!