Picking up phone chatter

What's the conversations about?

Can't tell. Low level and garbled. Hear series of beeps also between voice like a keying mic. Only hear one side of conversation.

With a Ham you will only hear the one in your area that is transmitting.

Read the link I provided in my above post. If it is a Ham there is not much you can do as far as the Ham radio operator stopping his transmissions....... On your end you can add some filters that may help.

How long are your speaker cables?
Are you using shielded ics?
Next time he is broadcasting turn off your system. With your ear fairly close to one speaker at a time, can you still here him faintly through your speakers?
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Based on the garbled voice (scrambled) and beeps you're noticing, it's probably consumer FRS or business VHF/UHF radio which can range from 0.1 - 100+ watts output. Either a neighbor, or somebody several miles away, could be the culprit. I've heard CB radio through my gear, but am unsure if CB is using tones these days.

I installed some shielded speaker cables and interconnects and no longer hearing "the voices". Plus the sound has improved. They're Audio Authority Four Conductor 14 gauge speaker cables and AA Excellerator IC's.

So far so good.