Both are fine products at good price points. Yet to me the TeraDak LPS is well made and better bang-for-buck. The USB socket is 5V out the other is 8.5V Yet is variable. it is supplied set at 8.5V so be warned - you will need to open it up and have a multi meter and with a small brass screw on the blue bit, turn it down to 5V (this is the cleaner output). And check what AMPS you need. The Shanti is buy and plug-in and forget.
I would GUESS the Allo Nirvana SMPS would also fit the bill and measures well. I HAVE NOT HEARD THIS PRODUCT yet suspect would a fine solution at a good price point.
I feel older DAC’s can benefit from USB into a DDC with SPDIF out. Newer DAC’s have better USB implementation and may not benefit so much from a DDC and other pre-dac gizmo’s. Measurements and Ears.
Good point @grizaudio LPS and AMPS: Apologies to my former post. I forgot RPi4 only was the OP topic. I have used the TeraDak X2 LPS only on the RPi3 and it was fine on its own (no HAT, no screen) just USB out and Ropieee OS. I use the Allo Shanti with the Allo USBridge Signature and its a great combination. RPi4 vs USBridge Signature in terms of SQ if I am honest the gap is not large. USBridge Sig USB into a high-end DAC (PS-Audio) vGood. IMHO RPi4 + Shanti + DDC into a high-end DAC via SPDIF = Better (only by small SQ margin)
… from website:
The transformer has a dual output (galvanically isolated) 5.2V 3A and 5.2V at 1.2A so you can power multiple devices (RPI 4, 3 + DAC, Katana, BOSS, or other) and we used independent (of course since they are isolated) filtering on each rail. First a capacitance bank (massive) to reduce the 50/60Hz noise, then an active filter, followed by an LDO to keep voltage stable. Since LDOs have poor transient and impedance, we used a last active filter (with good transient) and then capacitors more than 15.000uF but most importantly, super capacitors on the output. Final power comes in fact from super caps… transients and impedance of the LPS is… very good.
At last, Shanti includes AC line filter and AC side is earthed to casing. A few words on what we achieved. Measuring noise (in real word scenario) we see about 80nV (0.08uV of noise from 0-20Khz) at the floor of our AP machine. This is comparable to batteries from our internal testing.
Agree with @grizaudio. Go with the Shanti its on par with batteries and a fit a forget solution. I have used a RPi4 + Shanti + Digione Signature = very good indeed as low cost hi quality streaming solution. The Shanti can power the RPi4 + Digione Sig SPDIF HAT = job done. To me SPDIF just has the SQ edge over USB, yet do not blind test me on that as its DAC dependant (older vs newer) (feel like I should have bought shares in Allo!)
In my limited experience, (and running Ropieee on the RPi4) the USB quality “appears” to be improved over my two Lenovo Laptops. One laptop is an old nail, and appears to be quite “noisy” whereas the newer one is far better - but with USB run directly into an Audioquest Dragonfly Red and some decent headphones - the RPi4/ Roon has become my endpoint of choice for that location (my study).
A subjective view only - and based upon my system in my location…
Thanks, David. Your post inspired me to go buy a MicroUSB to USB-C converter. It does sound good. Now I’ll probably pull the rest of my hair out trying to see if it sounds as good as my DigiOne.
using this two piece of equipment give lot of power and no shutdown for the boards , Power Delivery makes no difference in fact for RPi4 , this work fine also for rpi3 with cable adaptor
pay attention to buy correct RPi4 version too … the first batch suffer USB-C Power Issues
Revision : c03112 means you are the lucky owner of a Raspberry Pi 4 Rev 1.2
