Not likely. These devices are inserted into unused RCA jacks and their efficacy is not certain. However, you are getting crosstalk between two active and connected inputs. Turning one off or disconnecting it will eliminate the crosstalk.

Yes, they work. Have been using several different types for a great many years - Cardas, PWB and home made. You can even use tin foil “hats” over the RCA jacks. Experimenting is the cornerstone of science. For best sonic results ALL RCA jacks should have caps, audio components, video components, etc. I use non shorting caps.

Hey, Geoff, putting them on unused inputs can work if those are acting as antennae and channeling noise into the amp. The OP, however, is complaining about cross-talk between inputs that are in active use. If the source to the connected but unselected input is turned off, there is no sign to cross-talk to the one he is listening to. Disconnecting the unused input works, too, and putting a cap/cover on it may reduce any noise that leaks in but has nothing to do with channel cross-talk. Also, it is tedious to do.

Actually the RCA caps do appear to prevent cross channel interference. What’s worse, crosstalk or interference? The PWB specialized RCA cap with the green cable tie wrapped around it strongly suggests there is also something else going on with these open RCA jacks besides RFI/EMI if you know what I mean.

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Actually the RCA caps do appear to prevent cross channel interference. What’s worse, crosstalk or interference?

The OP complained of the crosstalk, not interference. No harm in trying it but I remain skeptical.

I don’t mind if anyone is skeptical. I happen to be very skeptical myself. But there is of course such a thing as being overly skeptical. I only ask that people have an open mind but not so open their brain falls out.

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I only ask that people have an open mind but not so open their brain falls out.

Amen. That conjures an unpleasant image.

Getting back to the idea that RCA caps block RF from entering the equipment through the small openings of unused outlets, as it turns out an opening of 3 mm is equivalent to a radio frequency wavelength of 3 mm which translates to a frequency of 100 Gigahertz. Well above almost all radio frequencies that are in the air. So, unless the RF can slip though the opening doing the limbo not much RF can enter the open RCA jacks. So, as I intimated in a previous post, there must be something else a-going on with the RCA caps phenomenon. Cheers! I cannot think of an occasion when I would be playing a CD and a record at the same time.

Yes, depending on the construction of your RCA sockets (open back or closed back) RCA caps can also prevent the entry of insects and bacteria. Both of these are known to cause adverse effects on the sound of the system. Personally, I have my entire system sealed inside hermetically evacuated Mylar bags which are grounded to a beryllium rod embedded in granite with woven pixie hair.