Price: $359 (Single rail, 3 adjustable voltages)
Product link: https://upscaleaudio.com/products/sbooster-botw-p-p-mkii-power-supply
Power is everything. Some of the biggest improvements, outside of getting that expensive component upgrade you’ve been eyeing, come from upgrading the electrical power supply to your system. Whether it’s upgraded cables, a power conditioner, or better individual PSUs for components, the jump in detail, bass extension, air, and dynamics are electrifying. These are accompanied by notable drops in grain, noise floor, and a general fog around the sound that you didn’t even know was there until it went away.
The Sbooster Best of Two Worlds Power & Precision Mk II is a highly optimized, heavily shielded linear power supply with noise filtration. Available in multiple voltages, Sboosters are compatible with a wide variety of components. Now you can boost the performance of everything from a network switch to an Intel NUC to a Lumin streaming DAC to a Dr. Feikert Woodpecker turntable, and more. The improvement is often two-fold: not only do you give your chosen component a supply of clean, dynamic power, you take a switching power supply out of your system. This is especially true of network and computer components, which often come with a cheap & nasty PSU that injects high-frequency switching noise into the mains supply. This “wall wart” can pollute the sound of your entire system, not just the product it is connected to.
The Sbooster BOTW P&P Mk II has new features that improve power flow, reduce mechanical stress, and lower internal impedance over the original.
Aside from the Shanti, this is your other budget option. At double the price and for only a single rail, you’d expect the SBooster to surely be the better option. And in many ways it is. But if you enjoy more hype, clarity, and blacker background, you might like the Shanti more.
Personally, I prefer this power supply over the Shanti. The SBooster offers more density and better dynamics. It also has a warmish tone which is more colorful than the Shanti. But yeah, there’s only a single output.
What I like about the SBooster is how it’s easy to listen to. It’s very liquid yet has this tepid glow that relaxes you. In other words, if a power supply were to smoke a lot of weed, it would sound like the SBooster. This power supply promotes more of a dream than a reality. But seductive enough to be enjoyable.
Like the Shanti, this is a “better than stock PSU” option. The tone is decent but the timbre is a little off. It’s not quite golden and not really a neutral gray. “Rustic” comes to mind. Overall, a “fat” sound with fuzzy outlines that are glued together – and sounds smooth.
The biggest problem is that it sounds pancake flat. No depth at all. Bass is a bit looser (slightly flabby) and spills over the midrange. And articulation isn’t the smoothest. Treble is also a little grey rather than having a truer shine. Compared to the higher-end power supplies, the SBooster is firmly a value option.
In addition, the SBooster doesn’t separate, outline, or control imaging too well. Edges are fuzzier and lack curves. There aren’t a lot of textural cues to be heard and the sound is comparatively “lazy.” It’s a dimensionally flatter sound that is more blobby and smeared. So forget about hearing the leading and falling edges off of transients.
So this power supply is great for those who just want to chill without worrying about the details. For that reason, I could see this power supply being more forgiving for an assortment of systems. It’s not bad for the money. It just doesn’t have enough HiFi bits for my tastes. And probably won’t be for those with a more refined ear.
Between the two budget options, if you don’t mind a cooler tone, the Shanti does more of the technical stuff better (resolution, imaging, air). But not bass. The SBooster is more “musical.”
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Well Jay, you have only just gone and done it again. Another mammoth review. Don’t you ever sleep!?
As a Dave owner I was lucky to obtain the first production version of Sean Jacobs DC4 and have been using that ever since with a big grin on my face every time I use the Dave. It has possibly been the biggest improvement to the sound of my system (with the possible and honourable exception of my own Wave High Fidelity STORM dual BNC cables of course!).
However all of that is about to change because Sean has been kind enough to loan me a prototype of his new ARC6 version of the DC4 power supply. Having had the Dave all this time I was not aware of any deficiencies. That was until I plugged in the ARC6. As you say in your review the DC4 is a master at revealing the texture of instruments but now the ARC6 version has a transient speed to go with that textural information. It is a quite uncanny combination. The bass is also deeper and more powerful and yet manages to more detail and information in it at the same time.
You will gather that I like the ARC6 upgrade to the DC4 for the Dave. It is a huge upgrade to the Dc4. I understand that existing owners of the DC4 can have theirs upgraded to the ARC6 version by returning to Sean or to one of his agents in the USA or EU.
But that is not really why I was minded to put pen to paper in response to your review. A few months ago I did my own private shoot out of power supplies powering the Qutest. These included the Sbooster with Ultra Mk2 upgrade, Farad Super3, Allo Shanti, MCRU, Sean Jacobs DC3, PowerAdd battery, iFi, a cheap LPS from China and of course, because I could, the 5V rail from a DC4. Broadly I agree with all your comments and in the end I used the Farad Super3, not because it was the best but because it was a reasonable amount of money to spend for the performance gain with a Qutest. One thing to say about the value for money Allo Shanti is that if one has the necessary skills it takes a leap forward in sound quality if the supplied captive leads are removed from the circuit board and GX16 sockets are installed allowing after market DC leads.
I have more recently listened again to a DC4 powering the Qutest and although first time around I rejected the idea of a single rail £4,000 DC4 powering a £1.200 Qutest as being any where near a sensible decision I have now begun to wonder whether in fact it brings the £5,200 combination up to a level of similarly priced DACs and I think it might just do that. Such is the benefit of the DC4 with a Qutest.
So, thanks once again for the huge undertaking and it is nice of course to see you still using my WAVE STREAM cables with your Dave. 👍
Nick.
I would be curious to hear the ARC6! Is there a tonal color difference between DC4 and ARC6? More shine?
I agree, the Farad Super3 is a great value, especially if you enjoy that more liquid and smooth sound. From memory, I thought the Mojo Illuminati V3 paired well with the Qutest. And I could definitely hear the potential of the Shanti, the price is incredible for its performance (but critical listeners won't be happy). GX16 sockets with custom cabling would be interesting.
Have you tried batteries?
I run my RME ADI-2 fs DAC and streamer on pure LiFePo4 cells (without any battery management electronics of course). The DAC uses 4*3.2V 20AH cells in series, and the streamer 2 of the same in series. The batteries last more than a day so I charge at night when sleeping.
It would be interesting to know how batteries like these compares to the better power supplies.
Yeah, I was thinking about including batteries as well. Which specific ones would you like to see?
I think the more "pure" cells you use the better, and not small AA or similar batteries. Here is the ones I use:
https://shop.gwl.eu/LiFePO4-cells-3-2-V/LiFePO4-High-Power-Cell-3-2V-20Ah-Alu-case-CE.html
Of if you want one ready made for RME DAC, this one works (its just 4 cells in series), should be similar available in NA if that's where you live: https://shop.gwl.eu/LiFeYPO4-batteries-12V-1-1/Lithium-Battery-LiFePO4-12V-20Ah.html
But basically you want low internal resistance in combination with pure cells. For example, a power pack used for mobile phones sounds a lot worse (they have switched DC regulators inside to get to 5V).
It also important to stay away from "battery management", even if you risk damaging the cells if overcharged or undercharged. Those battery managements are filled with switched cheap electronic.
I then have 18 awg OCC coppar cables with cotton sleeves as only insulation, soldered to a DC connector of copper.
A whole nother world there! I'll look into it.
Yes, it is. I like the sound of my LiFePO4 batteries though, and LPS manufacturers often use batteries like those as "reference" to compare with (or so I have heard).
It's also worth mentioning that Stromtank (a really expensive HiFi power gear) uses LiFePo4 cells for their "magic", but enough of them to also drive power amplifiers.
You should include some of Gieslers power supplies. Aussie seller very high quality supplies. Kraftwerk 2
https://www.gieseler.com.au/product-page/kraftwerk-ii
Not even a Contact Us email address. Doesn't infuse confidence unless you're inside Australi and can call them.
Would been nice if u would included Ferrum Hypsos!
https://ferrum.audio/hypsos/
They said they would send the Hypos in...but I never received it. Will check again.
Amazing post Jay. The table of results especially. I'd also love to know where the Hypsos ranks if they ever send you one.
Thank you! Yeah, I haven't heard back from Hypsos. Oh well.
Hello,
Maybe invest in some gear to measure them Jay?
Best regards
Geoff
Pachanko Stellar LPS would have been also interesting to see compared with all these.
Request sent.
Cool : )
Please consider the SOtM SPS-1000. I heard its very good.
great work - thanks a million!!
comment to the Sbooster PSU: i kind of relate to your findings (using mk 1 version), adding (now unavailable) Padis fuse and Furutech Absolute Power adds LIVE to it. yet, possibly also to all other PSUs tested here
Yeah fuses could make all the difference...maybe I'll test those at a later time.
Hi there,
I know you cannot review everything under the sun, but I’ll selfishly propose you review the ISOL-8 Prometheus LPSU. Their power conditioners are great and I would be curious to see how their power supply compares with the others.
Amazing amazing review; very well done! Thank you!
So, farad 3 isn’t that good?
What fuse and iec did you get within test unit?
My Farad Super 3 is custom modified, but I think it performs very well. Along w/ Jay I am factoring in price and its incredibly diminutive size.
I am also curious about the remarks in comparison to other PSUs, which cable was used: silver or copper?
Listening was primarily done with the copper cable. Still great for the price, especially if you enjoy a full bodied and smooth sound.