Scored a Hapa Ember USB Cable last night off Ebay. Should see it next week some time. will compare to my Curious Cable. Hoping it might help that last little bit.
The Seas drivers are superb, i have owned & used several Lowthers, AER, Lii, Jordan, Omega, & many others. Too date the SEAS are by far my favorites. They Image like mad in the John K. cabinets. Bass is superb no REAL need for subs. Mine are barely broken in with maybe 250 hours. I bought them new and I built the cabinets based off Johns design I am very happy with them. Last night at 2am I swapped in the pure copper Digital Amp Co. speaker wires and did not completely solve the issue at hand but it was late and I was tired so will have to see today if I get a better outlook. Might swap in some 807 tubes for the Russian 6p3s I have been running