I just bought the latest Stealth Tunable usb and it does take roughly 10 days to runin playing 24-7/ this type of magnetic ferrite color you slide it up or down give you more fine tuning ,need more Bass slide the color up ,I do an inch at a time
since I bought new interconnects , and maybe speaker cables , new vacuum tubes
patience is a virtue , myself still sometimes lacking , Stealth Latest tunable retail
around $1950 8 bought a demo for $600 less , this is the middle model
the top one has 2 tuning modules and internally a bit different.
Surguei does not say much regarding his cables build quality , but makes a very good product.