Ceramic cap in current output circuit highpass filter

[living sounds]

The output circuit of the Chroma Polaris synth specifies a multilayer ceramic in the signal path (C6) forming a highpass filter with R7, following the high impedance current output of transconductance amplifier Z2.

Why? The synth is filled with polyester and polypropylene caps, one more of which wouldn't have added any relevant cost. Is there an advantage to using a ceramic cap here, while the disadvantages, especially nonlinearity related to voltage, do not matter with a current signal?

 

[JohnRoberts]

a 0.33uF film cap would be pretty large.

In that circuit it doesn't look like the weakest link.

JR

 

[living sounds]

It's a big old synth with plenty of space. Built like a tank in the USA. And it doesn't look like cost cutting was on their minds when they designed it.

I once put in a high quality film cap but actually preferred how it sounded with the ceramic. That's why I'm curious.

That cap is in the signal path after all. What IS the weakest link here?

 

[abbey road d enfer]

especially nonlinearity related to voltage, do not matter with a current signal?

Spot on! If the 3080 was a perfect current source, any element could be used there, whatever irs non-linearities, as long as it doesn't pass DC.
But the distortion generated by the 3080 probably exceeds largely that of the capacitor.