[sdiy] Power supply spike

[Louis van Dompselaar]

Sorry, I think I didn't explain myself clearly.  The spike is coming 
through the mains power supply into my active monitors.  It is produced
even when the modular is connected to nothing else...  it is NOT coming
through the audio path.

>> I've seen a lot of mains filters that filter incoming noise, but what do I
>> do to keep these spikes from going out?
> 
> This is very dependent upon what is connected when you power up.