Capacitors on/across Speaker Out Terminals

[1965GTO]

Hello,

What is the benefit of putting capacitors on the speaker out terminals? Is there one, why would they be there?

I caught this on a schematic. See attached.

 

[sofaspud]

Is this the sort of thing recommended for RFI? Seems it's gotta be a high-frequency shunt of some kind. I don't think I've ever seen it on a schematic, though.

 

[DigitalJunkie]

I've seen small caps,a couple hundred pF,on speaker outputs before. I assume it must be to suppress RFI.

 

[jaycee]

They are RFI suppression. Sometimes they add a resistor too, and in this case it works as a Zobel network

 

[martin clark]

Otherwise it's a really bad idea. Pure capacitance on the output of power amps does no good at all.

 

[nigelwright7557]

Zobel, emi or if class d a filter capacitor.