[Elecraft] speakers

[Monty Shultes]

All this talk about speakers prompted me to resurrect a pair of Apple 
amplified speakers that have very good frequency response.  All was well 
until I tried 10 and 6 meters - then got the "thumps and bumps" in the form 
of a loud hum.  Tried FOE (ferrite on everything) first with no success. 
Opened up the speaker and found not one bypass capacitor.  I put one 
(.01ufd) across the power plug, and after zapping the amplifier module, one 
across each of the stereo amp's power inputs.  Perfectly quiet now.
Monty K2DLJ

> Some (possibly many) PC speakers include internal amplifiers which can be
> susceptible to RFI which results in "thumps 'n 'bumps in the night".
>
>