Price: $575
Product link: Discontinued.
Update 9/11/2023: Paul Hynes has gone under a lot of scrutiny for misappropriating funds and customer deposits. Many have lost their deposits, including myself. There’s recent speculation and some confirmed accounts of Paul stealing deposits from unsuspecting customers for potential power supply builds. I’m just keeping this here for posterity, but please do not attempt to purchase a power supply from Paul Hynes.
The SR4 power supply has been designed in response to customer requests for a high quality power supply for powering a range of digital audio interface equipment, and analogue equipment, with a single supply rail requirement. There are many products available in the market with different voltage requirements so it makes sense to provide an easily adjustable power supply to cover a number of voltage options, thus making the power supply more universal in application, when customers change their equipment.
Unfortunately, PHD Ltd is now closed because of insolvency. I figured I’ll keep their power supplies in this comparison if you’re looking for it in the used market – or if you’re simply curious like I am.
I’ve actually written a review of the SR4 a while back here. The one I reviewed here was a different unit, but it should be a similar impression. But this time I can describe it relative to all the other power supplies. It’ll give me a better picture of where the original SR4 really stands.
In direct comparison to the SR7 and SR4T, the original SR4 does not have a realistic form, but the tone is much more natural. In fact, it probably has the best tonality and timbre out of all the power supplies on this list. This power supply does not layer out or image with amazing precision, but it’s incredibly musical.
I don’t think you’ll ever say the SR4 sounds truly “real” because there isn’t an exorbitant amount of spatial clarity. And soundstage isolation and depth are also limited. The music stays in front of you and doesn’t immerse or try to pull you in. But I feel as far as artistic intent, this power supply will get you closer than most. It’s self-effacing but in a comfortable, earthy way. It just has so much soul and warmth.
In the end, the SR4-12 has a silky, warm character. It’s not the most detailed or molded. But it wants to be more romantic than snappy. More cozy than airy. Making it the most organic-sounding power supply in the group. It has a good balance of tonality and body. And for some reason, I kept gravitating towards the SR4-12 for a lot of my listening.
I would prefer better outlining, texture, and transient clarity. And perhaps more acoustic mold. While listening to the Wicked The Musical Soundtrack, I felt it missed out on textures and some of the inner details. It’s slightly softer on the edges and not super tactile or gritty. Unfortunately, the bowing of a cello also isn’t very fibrous. In addition, the smoothed over airy bits make it difficult to hear the space around the performers.
First, these power supplies are tough to find in the used market. And for good reason.
Technically, there are better-performing power supplies here. Including the Paul Hynes SR4T. But if tonality and musicality are the top priority, the SR4-12 might be worth the tradeoff. It’s not for the transparency chasers. It doesn’t have a holographic sound. But it has the most lifelike and truthful tonality and timbre I’ve heard so far.
If you don’t require heavily focused imaging, infinite detailing, or a more filled-out and rounded sound…the SR4-12 might be music to your ears.
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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.