External Linear Power Supplies


Does anyone have any experience in comparing the following external linear power supplies:
SBooster (most expensive)
Small Green Computet
iFi Power Supplies (least expensive) ?

I am interested in effectiveness, and bang for the buck.

I would use one of these to Power a Chord Qutest, a SugarCube SC-2 and a Massdrop THX AAA Headphone amp.

Thanks.

kingbarbuda
You would need a separate power supply for each of these because they have different DC voltage requirements and different connections.

The iFi power supply might be better than some stock power supplies, but it’s still a wal-wart switching power supply. I would avoid it if you can afford the better ones.

If you’re on a budget, I have had good results with the China Teradak linear power supplies. Here is one with a 5V micro-USB cord for the Chord Qutest.

https://www.ebay.com/itm/TeraDak-DC5V-2-5A-Micro-USB-Linear-Power-supply-For-Raspberry-Pi3/183841452...
kingbarbuda  Go with the Small Green Computer 200W unit. It offers 4 variable outputs. Andrew is great with support.

"Independent 19VDC, 12VDC, and 2 x variable Outputs can power four devices simultaneously"  

The variable Outputs range from 3.3v to 15V.

I use the 100W unit (no longer made) and it is quality unit. The included cables are a great starting point, however, you will get additional performance gains by going with custom DC cables. I use Ghent.

If you believe in a separate power supply for each unit you need to power, then go the SBooster route. There are other options as well.
I don't know if this will help but I've powered my Qute EX DAC with an iFi Power and a Teddy Pardo. The Teddy Pardo was the better of the two. I heard no difference between the stock Chord power supply and the iFi Power.

I've also powered my microRendu with an iFi Power and a Small Green Computer 7V. I won't look further than the Small Green Computer power supply. Great bang for the buck.

I've not used an SBooster but they are well-reviewed. 
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@elizabeth - that sounds right as the iFi is basically a switching power supply.  I'm sure that's a big reason why melvinjames did not get an improvement with it.

That Massdrop THX AAA unit looks to require a 24V DC power supply, so you are likely going to have to have to have at least two external power supplies because this is a higher than normal voltage for these linear DC power supplies.  Most small devices range 5-15V DC.  Even the 200W Small Green Computer only has a 19V output (unless you can get them to custom build a power supply).

So, either a single SBooster or Teradak for that 24V Massdrop.  Then you could try to find a dual-output power supply for the 12V SugarCube and the 5V Chord Qutest (with special micro-USB connector).
There are some brands of linear power supplies that offer multiple outputs and can be configured with differing voltages.
Bob
I suggest that you compare used lab grade supplies (e.g. HP / Agilant) with 'audiophile' stuff, spec by spec. Bet that used lab equipment gets you far more quality for far less money.
I don't completely know about that.  I suspect that Lab grade units use switching power supplies because everything is controlled from a digital/computer circuit.  I could be wrong, maybe there is a lab unit with linear power supply.
I use the Illuminati v3 power supply from Mojo-Audio.  They are second to none.  When I first plugged it into to my SoTM gear I was stunned.  Highly recommended. 
They are second to none.

What have you compared the Mojo Audio unit with? Thanks.
I have a small green computer 12v linear power supply and its does the job nicely,  haven’t compared with S-booster but it is quite a bit better than the old switching power supply I started with,  (using with SMS-200Ultra+
While I've never used them, I would put wyred4sound on my short list.. Here is their link to their modular power supply:https://wyred4sound.com/products/upgrades-accessories-0
Auxinput, you have a point. I like the old stuff, and kind of assume that's all there is. If my supplies from the 70's are switchers, they sure do act like linear!
I'm wondering if it's worth putting a LPS on my Nighthawk Netgear router which is a 12v 3.5amp device per the wall wart. What changes in sound might I expect? I ethernet cable the router direct to my Lumin T2.
Thanks for any insight. 
@tuberist Improvement across the board and across the parameters we value. Make sure you are using a quality LAN cable as well.

Remove every SMPS wall wart and replace with linear power supplies. LPS with multiple outputs are available at a variety of budgetary price points.
I have 4 LPS’s. They offer a significant improvement in SQ. Only one got very hot to the touch - which is a bad thing. It was the one powering the modem/router. Even though the spec’s continuous amperage rating was more than double the load, it still got too hot to leave unattended. It didn’t have heatsinks. I replaced it with one that does.

My take-away from this is that a modem/router works pretty hard to keep multiple devices in the house online. The other three LPS’s (w/o heatsinks) in the rig never get above room temperature - even after many hours of continuous use.
Update: I just added another LPS. Previously, my separate modem and separate router shared one LPS via a 12vdc umbilical cord with a Y splitter.

With each unit having its own robust power supply, SQ has improved significantly. Better everything - transparency, dynamics, sound stage, etal. Tidal is now sounding far better than my CD Transport/DAC combo. And it’s a very respectable combo!

Currently, the two LPS’s are plugged into the same power conditioner. Soon, each will have its own dedicated conditioner. Cross-contamination is to be avoided.
@steakster what LPS makes/models did you get? Thanks. 

@kingbarbuda For my modem and router, I purchased two of these LPS’s – with heatsinks.

As mentioned earlier, the LPS’s for the modem and router can get hot - especially, if someone else in the house is a gamer or watching a movie online. In my home, the modem & router are sitting unattended on top of a wooden cabinet. So, fire safety is a concern. I placed fire resistant material underneath as an additional precaution. Safety first & foremost.


For the digital components in my audio rig, I purchased two of these LPS’s – without heatsinks.

When I first turned them on, I was astounded. The SQ was much more bold with the music having body. An acoustic guitar sounded like it was in the room. These particular units utilize a different power regulator than the other LPS’s. Without heatsinks, these units never get warm to the touch - with the low draw digital audio components. But, when I tried one of these units with the modem or router, it got dangerously hot to the touch. I quickly returned it to where it was before.


Generally speaking: Having owned several brands of affordable LPS’s, I find it extremely difficult to determine if one is significantly better than the other. (I haven’t owned any expensive units such as Teddy Pardo or Paul Hynes or Empirical Audio Dynamo.) There are so many variables – type of transformer, quality of capacitors, internal wiring, connectors, etc. With a hi-rez system, a change in power cords will easily yield a different sonic signature. Another substantial improvement would be to replace the cheap manufacturer’s 12vdc umbilical cord with a quality cord from Acoustic BBQ. As long as the LPS meets the necessary specs for driving the component – and is from a reputable company with positive reviews - it will still be far superior than a wall wart.