The e power supply was the most significant upgrade. Later the main unit was tweaked, with the addition of balanced input/output, and a slight cosmetic change.
Absolutely contact Jon Soderberg, he was at Threshold for many years during that time. Im sure he could make your FET9 perform as well as any out there.
Absolutely contact Jon Soderberg, he was at Threshold for many years during that time. Im sure he could make your FET9 perform as well as any out there.