After quite some investigation I will most likely go for Mundorf Silver/Oil. Possible candidaces are: Audience Auricap and Audio Note Copper Foil (Silver Foil are way too expensive). Since I have WIMA MKP at home, I will try these as well (for fun - they should be very transparent and thin).
Value is determined by C = 1/(2*pi*R*f), where f is a roll-off frequency. Coupling cap forms a high-pass filter with resistor and impedance of the next stage (power amplifier). I recommend values 470nF and larger.
Matej
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