Well the Jupiter Copper Foil 0.47uF 600VDC capacitors have some great characteristics, including Transparency, speed, detail, they are also fairly open and extended. The weakness, they are a little lean, bright, and white, also they don't have the duelunds lovely lower midrange weight, warmth and energy, they lacked a little timbrel character. I feel that the Jupiters weaknesses stem from the use of the silver lead-out wires, sure these leads will give you clean transparency, but at what cost. Unfortunately most capacitor makers seem to be going down the silver route. They did many things better than the Duelund Copper Foil 0.47uF VSF, but at the end of the day the duelunds had more involvement weight and natural timbre.
There is a caveat, Jupiter sent me an email. quote
The caps are non polar, but to use the outside foil as a shield connect it to the lower impedance side of the circuit.
Chris Young
Jupiter Condenser.
Craig has listened to the Jupiter capacitors and feels they sound just superb, but only when they are installed in the right direction, if they are not set in the right direction they will sound ordinary. They are marked with a stripe but that mark is sometimes wrong and reversed in manufacture, (despite what the manufacturer says) unless you can measure them it's hard to know if they are the right way around. I used 4 and that allows for a multitude of wrong combinations. I will send mine to Craig to get right orientation and listen again.