Hey chaps, I’ve been kindly loaned a PhoenixUSB for the past month. It’s very impressive with the sonic characteristics well described in this thread - in particular a lovely flow, a lush midrange and weighty, musical bass.
I've taken the opportunity to try a few basic tweaks with it in case even more performance could be eked out. Actually my focus has been on closing the gap between some other DDCs and reclockers I have, but I can’t resist trying em with the Phoenix too. One in particular this evening reaped real dividends for marginal cost. An A4 sheet of 0.15mm thick ‘MuMetal’ equivalent highly magnetically permeable alloy just placed on top of the chassis deepened and tightened the already impressive bass even further and made the timbre of a double bass richer still. And y’know what was better than a sheet of MuMetal on top, two sheets that’s what. Not diminishing returns either, same again. Seriously weighty and rich, so palpable, oh the focus & layering!
Got it from here, as sharp prices as I’ve found for this 0.15mm thickness. Background is I had one sheet I used to shield the two toroidal transformers in my DAC - which I did by encasing them in cylinders with lids. It was so effective both sonically and measurement wise (a 5-10x reduction in field strength with my Gigahertz solutions meter) I promptly bought 4 more.
https://diyhifisupply.com/product/f...ding-sheet-0-15mm-305-x-203mm-or-12-x-8-inch/
Give it a whirl, pretty remarkable what even crude magnetic ‘shielding’ like this can achieve with far from an optimal 360 degree coverage. Just providing a flat plane as a more attractive alternative path to take a few of the stronger AC magnetic field lines up and away from sensitive componentry like its OCXO circuit, a few less micro level eddy currents induced as a result.
Edit - just discovered with my MF meter the Gustard U18 DDC sitting on the shelf above was radiating AC magnetic fields something chronic, so part of the effect may have been shielding between the two. Gustard now switched off, but fields generated from Phoenix are similar level. Anyway the positive sound delta with sheets vs not persists after Gustard turned off and is not subtle.. on top of the bass control there’s more palpable and focussed vocals, deeper soundstage etc.
Edit 2- due to space constraints the Phoenix is sitting directly on top of my Athena preamp, which coincidentally has its own transformers in a bottom layer segregated from the preamp signal path by a thick layer of MuMetal.. Denafrips build it this way. But it’s possible the Phoenix’s MFs have been messing with the Athena’s analogue gain stage circuitry so the MuMetal sheets I placed on top of the Phoenix may have lessened this by pulling the MFs up and away. So many variables. YMMV.