You might disconnect the speaker from the wall wart and
the audio source which means, of course, that you can't use it
right now, but see if the RFI is still audible. Then, connect
the wall wart but leave the audio input lead off and see if your
RFI comes back. It is possible that it is coming in via both the
audio input cable and the power cable. You might need chokes on
both sides of the audio input line and both conductors in the
power cord from the wall wart.

Bob Martin writes:
> I had that problem on 40 meters with a set of Utah speakers. Tryed chokes,
> shortening the leads to the speakers, and finally a counterpoise for 40 
> as I
> was on the second floor.  The counterpoise did the trick.  Made it by
> shorting a 33 inch of ordinary electrical wire on one end and attaching 
> the
> others to the terminals on my tuner.
> 
> 73:
> Bob Martin
> 
> EchoLink Node - 55127
> Please visit http://www.wan-leatonks.net.
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, May 07, 2012 7:04 AM
> Subject: Interesting RFI Problem
> 
> 
> > Hi, all.
> >
> > Well, I have an interesting little RFI problem here in the home shack 
> that
> > I've been scratching my head over lately.
> >
> > At the estate sale I've been talking about, I picked up a Realistic
> > 32-2040
> > amplified speaker.  The speaker either runs on 6 C-cell batteries, or 
> the
> > supplied 9-volt wallwart.
> >
> > The speaker sounds terrific, with excellent quality  audio that I can
> > adjust
> > in terms of tone and volume from the speaker itself.
> >
> > However, when I transmit with my TS590, using my amplifier, I get lots 
> of
> > RFI through the speaker itself.
> >
> > I have tried RF chokes on both the Wallwart power cord, and the phono 
> plug
> > connection between the Ts590 and the speaker itself, but no joy.
> >
> > I have tried running the speaker just on batteries, but still get the 
> RFI.
> >
> > Obviously, this particular speaker is more susceptible to RFI than 
> usual,
> > since I don't get the RFI at all when using other speakers such as my
> > Motorola amplified speaker or just a standard external speaker.
> >
> > Does anyone have any suggestions as to what else I might try?
> >
> > I'd love to use the speaker since it sounds so good, but the RFI issue 
> may
> > make that impractical in the long run.
> >
> > 73 from Tom Behler: KB8TYJ
> 
>