Give Underwood HiFi a call they are currently selling them. I use to own the Final 1000 made by the same people and they look very similar. I notice you had a Pass 350.5 and that is how I powered mine and they loved the power, it is a very good speaker especially on voice and piano, hopefully they will sound as similar as they look. Best of Luck
Has any one heard the Essence 1600 Electrostat?
Has anyone heard the Essence Model 1600 Electrostatic Speaker?