Folks,
@Superdad was kind enough to include me in beta testing for the new Uptone Audio JS-4 dual channel power supply.
Full discussion is here:
https://audiophilestyle.com/forums/...s-photos-tech-highlights-and-production-info/
I'm copy/pasting my impressions below for its potential interest to Olympus owners with the Taiko network stack
First impressions. When powering my Taiko network stack (see my current reference system below, see my Taiko Olympus review for more system details) the JS4 is a clear significant step up from the JS2, and improves on my (he who is not to be named) SR4B-12
Qualitatively, my SR4 is maybe 70% of the way between the JS2 and JS4? Well done Alex and John.
My first goal was to determine how impacted the JS-4 is by upstream power quality. To do so, I compared the JS-4 energizing the full Taiko network stack (DCD, switch, router) when plugged into a standard shared home electrical circuit, into my dedicated 30A/6awg audio circuit, and my Sound Application TT7 power conditioner plugged into my dedicated audio circuit.
The JS-4 plugged into my dedicated audio circuit was a clear step up from a shared home electrical outlet. More speed/attack, better/richer bass resolution, and improved imaging (detail/positioning and depth), all attributes I've come to expect with better power to my Taiko network stack.
With my TT7 in the chain, there was another step up in these usual attributes, but also a very noticeable improvement in what I'm now calling "relaxedness" (an attribute that I've become very attentive to since moving to the Taiko Olympus).
Alas, try as I may to find otherwise, the TT7 remains essential in my audio setup
Next, I evaluated the JS-4 powering my Taiko switch and Taiko router directly vs via the Taiko DC distributor. For this, I switched the JS-4 to dual channel 12V output, and I needed to use a generic 2.1->2.5mm DC barrel adapter for the Taiko switch (not optimal, but both require 2.5mm DC connectors)
In this configuration, JS-4 direct (no DCD) had excellent speed/resolution, but gave up some of the "relaxedness" that I've come to cherish (and admittedly, I likely keying off this attribute more than most) I think folks with the Taiko network stack would be very happy energizing the Taiko switch and router direct from the JS-4. If I had to choose between a Taiko DCD and better energizing DC supply, I would definitely go for the better DC supply. Alas, the Taiko DCD still brings goodness to the party, even with the TT7 and JS-4 upstream.
Finally, for fun I gave a quick listen to the JS-4 in single channel mode vs the JS-4 in dual channel mode, energizing the full Taiko network stack (including the DCD). Switching back and forth, I would give maybe the *slightest* edge on speed/dynamics to the single mode on the JS-4, but honestly, a slightly different espresso pull on my afternoon latte could have caused me to hear things differently.
Note for all of my listening tests that the current beta JS-4 units do not have the over current protection/reset circuits that the production units will have. Folks' experience with the production units may be different. For reference, the Taiko Switch draws 0.1A at 12V, and the Taiko Router 0.5A at 12V, so both operate comfortably at the 2.1A that the JS-4 can supply in dual channel mode.
TL;DR
* Uptone JS-4 is a significant step up from the Uptone JS-2 when energizing the full Taiko network stack in my setup
* The JS-4 is a clear step up from my reference ***** SR4B-12
* JS-4 is sensitive to quality of upstream power, and alas, my TT7 isn't going anywhere
* JS-4 does a very admirable job energizing my Taiko router and Taiko switch directly (bypassing the Taiko DCD), but the Taiko DCD still brings more much appreciated "relaxedness" to the party
I am hoping to have access to a mini Sean Jacobs DC-4 soon(ish). If I'm able to secure the loaner in the time I have with the JS-4, I'll post an update here. Even before that, JS-4 is a fantastic upgrade from the JS-2
Many thanks to Alex and John for including me in the beta!