Idea to reduce RFI

well, at one point my brother had the same issue - FM radio channel playing thru his speakers! He solved it by using XLR interconnects. The balanced interconnects have the FM channel on both + & - wires but of opposite polarity thereby effectively cancelling the FM signal. He now does not have that issue any more.

Shielded cable is good but remember that it adds extra capacitance which reduces the cable's bandwidth + adds a cap load to the amp. Sonics could/will change. In some cases (maybe yours) you might have no choice.
Power conditioner: I've found that the best solution is to not use one! They always change the sonics for the worse (the ones I tried). However, YMMV.

>> 06-21-08: Kirkus
>> If you want to eliminate an RF interference problem,
>> then you must take the system completely, totally
>> apart, then add each component to the system one at a
>> time to see the point at which the RFI appears.
good advice, in general.

>> That is, start with just power amp and speakers.
Now, how does Milen007 get music to play thru the speakers? Run the CDP directly into the power amp? If yes, the 2V CDP will most likely saturate the power amp input stage & cause high SPL (distorted) sound. He could buy some in-line attenuators but then that's costing Milen007, which he might not be willing to do (?)

>> Second, if you can hear the audio signal (modulation),
>> it's an AM transmitter, not TV, or FM,
Theoretically you are correct - FM is constant envelope modulation. However, in really life due to interference from buildings, foliage, terrain, etc the FM signals are somewhat AM. So, the possibility of catching a FM station thru Milen007's system is quite real.

>> And third, the 'balanced' nature of balanced
>> interconnects have no effect on RFI
this statement could NOT be further from the truth!! It seems to be a statement you have made out of total ignorance in the matter.
Go look at any RF layout whether it is I.C. layout or PC board layout & you will see differential circuits used exclusively! Differential circuits ARE balanced circuits. It is one very important way to curb RFI.

>> very few balanced input stages have much common-mode
>> rejection above 3KHz or so.
Another terribly ignorant statement!! If your statement is true then the designer of that circuit has failed miserably!
If the designer has designed the circuit correctly the CMR frequency range would be atleast upto the -3dB corner & even upto the unity gain frequency of the circuit.

>> For more information on the subject, I recommend Bill
>> Whitlock's excellent papers (available at
>> jensentransformers.com), which I agree with the vast
>> majority of. I also highly respect the work of Douglas
>> Self and recommend reading all of his stuff . . . even
>> though on this particular subject I differ with his
>> conclusions.
Kirkus, thanx for the reading recommendations. I'll check them out.