fdd5d689_e_Notes_on_Coupling_Capacitors__Impressions_HV
[Brand] Jupiter Condenser Company Paper and foil in beeswax, 600V $40.00 [Impressions LV] These are really spectacular caps, as they had better be for the money (I also bought these on closeout from Welborne and paid about half the typical asking price.) Other than a slightly warm leaning, they are about as good as no cap. Liquid mids, clear bright highs, strong full punchy bass ... Beyond this level, I think it is just personal preference, and not that any other cap is better. [Rating] 4 [Impressions HV] 
The high voltage review is about the same as the low voltage one. Excellent resolution, clear clean sound without a touch of hardness or artificiality. Less pronounced midrange than the Auricaps, and more balanced bass as well.
ecp audio diy: Some Notes on Coupling Capacitors
Impressions HV