fdd5d689_e_Notes_on_Coupling_Capacitors__Impressions_HV
[Brand] Blackgate N Series 50V bi-polar electrolytic $3.25 [Impressions LV] Saying anything about Blackgate caps is entering into a religious war. Some people swear by them, others find them to be all hype. To me, in a signal path, they sound slightly more grainy and less detailed than good film caps. However, they also seem to have a warm fuzzy sort of sound that can be really pleasing (though I have heard this is unique to the N series.) One particularly useful thing about them is that they are small and come in large values and thus can be used where film caps do not fit, or do not exist (which is particularly the case if you need a large cap such as at the output of a headphone amp where 470uF is a common size, and 1000uF is not unreasonable), and this may be where they are best.. However, I'll note that people like Audiosector who are neither space nor value limited use them as output caps in their TDA1543 based NOS DAC. So, all of that is to say that there are times that they might be the right choice, and times that they are not. Fortunately, in the 4.7uF size, it is not particularly expensive to figure this out. [Rating] 2 ½ [Impressions HV] 
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ecp audio diy: Some Notes on Coupling Capacitors
Impressions HV