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Best Cable for canceling RFI

Problem:
WAY too much rfi interferance from local broadcast FM radio signal.

System:
Jolida 302a Integrated Amp, Castle Acoustice Richmonds, Rega Planet 2000 CDP, Kimber 4pr speaker cable. DIY power cable.

I have tested everything and all interconnects disconnected

I am getting an identifiable signal from a local FM radio broadcast - 91.5 Brooklyn New York - SUNY rebroadcast of foreign radio - when nothing but my amp plugged into the outlet.

I build my own power cable - Shielded Belden Cable with Shurtere IEC and Marinco Hospital grade wall plug. I grounded the shield at the wall plug end.

I was listening last night and it's driving me mad!

How to fix? New power cable? w/RFI canceling? Will it REALLY make a diference? Will 'power conditioning' help? Like an 'on-line' UPS?

Much thanks in advance for you thoughts.
keithcady

Showing 2 responses by seandtaylor99

seandtaylor99
1,262 posts
 
When you disconnected the interconnects was it at the amp or the source end ? You should have disconnected at the amp end to make sure the interconnects were not acting as antennas. Not all interconnects are well shielded, but you can build very good ones quite cheap.

I doubt your power cable will help since none of the wire between the circuit box and the outlet is shielded. You're right to be thinking about a power line filter to remove interference from the mains.

I would try to home demo a power conditioner to make sure the amp is not susceptible to air-borne RFI interference. RFI can get into the amp from the power supply OR just from the air into the preamp section of the integrated amp. Just hope it's not the latter. A power conditioner may not help ... so I would try before you buy.

Good luck.
seandtaylor99
1,262 posts
 
Sound not being affected by the volume control just means RFI somewhere after the volume control, which could be in the power amp (that section of your integrated amp) or in the speaker cable. I think it's more likely in the amp, since speaker signals are generally too big (in voltage and current) to suffer from RF interference.
Since one speaker is worse than another to me this points the finger at the amp and not the power supply (the mains).
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