Paul, thanks for your time and advice.
Yes, the amp does not click from day one :) The click is faint enough to
be noticeable only when nothing is playing, but it is definitely there.
The adapters I've used follow the AV2 Homeplug specification, so they
should modulate a signal in the 1.8MHz to 86MHz band.
I resisted many years using this technology and was mildly amused at the
"gigabyte" class claims, but I have to say I was quite satisfied with
the results overall. All my attempts at testing performance under
adverse wiring conditions (deliberately plugging the adapters via
extension cords) came up with more than adequate performance for
(multiple) AV streams.

P Nelson wrote: 
> My first though is they are defective.  My second thought is maybe they
> are simply poor design.  Trying a different brand may test this theory.
I will rule out that all 4 are defective. I terms of design, I am a bit
reluctant to point the finger at the TP-L*nk adapters I chose,
considering their overall compliance and performance; although I could
have gone for Dev*lo adapters just the same. My choice was a matter of
price point (these things are not exactly cheap) at the time of
purchase.

> But what if the noise is coming through the audio signals?  Disconnect
> the audio input to the amp to see if it goes away.   If yes, you have a
> harder problem to solve.
I missed testing this hypothesis; unfortunately I've packed up
everything so I can't test anymore. Here the SB3 is connected via
toslink to a V-Dac which RCA outputs are connected to the Rotel amp. I
should have put the SB3 and the V-Dac out of the chain to test (both
have flimsy *looking* switching PSUs -esp. the V-Dac.) 
I have 4 SB3 in the home powered by either slim-era or Logitech-era
PSUs, but the issue appeared at this location only. 
(If someone insists I can unpack and test for the sake of advancing
science...)

> If it is the power source then you should be able to filter the noise by
> using capacitors or a choke.  Look up filtering for ham radio equipment
> or contact a local club.
Excellent, thank you again.



4 SB 3 • iPeng (iPhone + iPad) • Squeezebox Server 7.9 (linux) with
plugins: CD Player, WaveInput by bpa • IRBlaster by Gwendesign (Felix) •
Server Power Control by Gordon Harris • Smart Mix, Music Walk With Me,
What Was That Tune? by Michael Herger • PowerSave by Jason Holtzapple •
Song Info, Song Lyrics by Erland Isaksson • WeatherTime by Martin
Rehfeld • ShairTunes2 by disaster123 • Local Player, BBC iPlayer by
Triode • Auto Dim Display, SaverSwitcher, ContextMenu by Peter Watkins.
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