fdd5d689_e_Notes_on_Coupling_Capacitors__Impressions_HV
[Brand] Sonicraft Sonicap Gen I, Metalized Polypropylene, 2uF, 400V $11.25 [Impressions LV] . [Rating] 3½ [Impressions HV] 
These are the house brand of caps from Sonicraft. Perhaps owing to the lack of a middle man, they are priced lower than a lot of their competition. However, from a performance standpoint, they are, in many ways, a step up from many of the more expensive "audio" caps. In audio reviews, people often talk about omission vs. comission. Omission, simple loss of resolution, is generally considered to be less of a sin than comission, the adding of "color" to the sound. Many polypropylene caps, Auricaps being the canonical example, add a midrange bloom to the sound while rolling off the frequency extemes This is, of course, both omission and comission, and the comission is welcomed by many. The Sonicaps, on the other hand, don't do the comission part, and don't do the omission to the same extent. Instead of rolling off the frequency extremes, they are just neutral, flat, almost unnoticable, caps with maybe a touch of bass emphesis. If anything, resolution is not as good as the best caps, but it is very close. It is, in character, essentially a slightly less resolving Mundorf Silver/Oil with slightly better bass. Moreover, that loss of resolution is very small and manifests itself in a sort of flattened body and overly smooth midrange -- which is not always a bad thing. But, as I say, it is hardly noticeable.. These are a clear step up from Obbligatos, and probably a nice step up from Auricaps. In fact, they are close to being category 4. They are probably a nice half way stop between the category 3 and category 4 caps, which may necessitate adding a new category. Highly recommended, but give them a few hours to sound their best.
ecp audio diy: Some Notes on Coupling Capacitors
Impressions HV