Most of my posting in this blog is about capacitors. Let's say Wima, Nichicon and ELNA Silmic. That is my choice for best performance to price ratio for audio application caps. Wima it self come with many size. The MKP is the best one for the audio signal. They are offering natural sound and slightly thin to the mid range frequency. Elna is also good at it. Especially the Elna Silmic, it is small size electrolytic caps which offering warm and natural sound. Both Wima and Elna Silmic caps have small size. If the capacitor placement is not an issue at all, then look no other than the paper in oil capacitor. Frankly speaking, this is the best capacitor I've ever use for the audio signal. The sound-stage is wider, the layer sound is separate nicely and the sound is smooth and natural.