If Thorsten was involved, it's likely an exemplary device.
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I added an iPurifier to my transport and DAC combo after it was recommended to me by a forum member. I was told for optimal performance it would need an LPS.
With that said, I was not impressed using it in my 2-channel system with the stock wall-wart.
After allowing 200 hours run-in time, music was still sounding anaemic, lacking low-end extension, a narrow soundstage. But it did improve detail.
I suspected that I had a jitter issue and needed a reclocker (the trial period for the iFi had expired) so I ordered a LPS with a large torroidal transformer and high quality caps. The improvement in SQ was astonishing with XL dynamics, wide and deep soundstaging, and music that had real weight to it. I finally had a system that was non-fatiguing.
I already had decent components; Audio Note Dac and PS Audio PWT. The iFi was a low cost solution to improve my digital.
You are correct, an LPS does improve its performance. That said, the tests also show that the Gustard U12 performs better natively, and about the same with the LPS added for the iFi.
^^^^ You selectively left out an important part of the review regarding the comparison with and without an LPS:
"I should note that these are not audible problems as the levels are quite low. Just lack of good engineering and system design."
Nonetheless, still curious to know which LPS gave "astonishing" difference in the sound quality.
What the review doesn't mention is how the S/PDIF coax cable can affect jitter and the overall SQ.
In my system using a PS Audio PWT and Audio Note NOS dac, the iFi plus LPS made a noticeable improvement. Music's more organic, spacious, has more weight, lower noise floor. I was using a variety of coax cables, always searching for one that would help achieve that analogue-like presentation.
I'm now using a High Fidelity CT-2 SPDIF and the improvement is astonishing. With this cable the sonic effect of the iFi is negligible.
As a reminder, in the review the iFi was tested using a SMPS wall-wart. Not really a fair test for use in a high-end system. Even the designer of the Synchromesh recommends the use of a LPS.