fdd5d689_e_Notes_on_Coupling_Capacitors__Impressions_HV
[Brand] Clarity Cap SA Metalized Polypropylene, 3.3uF, 630V $5.85 [Impressions LV] . [Rating] 2½ [Impressions HV] 
These caps had the misfortune of being dropped into a circuit that had previously been sporting the Mundorf Silver Oils. And, as budget caps, they were bound to get the losing end of that stick. But, after listening to them for a while, their good (and bad) qualities started to come out. These are the top of the line, I believe, Clarity Caps (I have some of the less expensive PX caps to try too, but their voltage rating of 250V is too low for my test rig so they'll have to wait). Even at that, they are dirt cheap (and www.e-speakers.com will even ship them for free!). Their basic characteristic is one of flatness. This is both good and bad. The bad is that they lack the top end sparkle, detail, and dynamics of expensive caps. They have nowhere near, for instance, the resolving power of the above tested Mundorfs, or even the Auricaps for that matter, sounding a little muddy in the mids. On the other hand, they do not have any hardness which can be a problem with a lot of plastic caps. They also don't have as much euphonic bloom of something like an Auricap, so they seem a little more true to the source. The goodness of this, of course, is relative to the circuit they are used in. But, if you are looking for a budget cap, I think these are a good choice. If they cost $18 like the Auricap, they would be way overpriced, but at $6 are a good option -- a nice step up from something like a Solen.
ecp audio diy: Some Notes on Coupling Capacitors
Impressions HV