| Re: Bad clipping problem
Right. That first graph was the soundcard direct into the DSP1124 in bypass. I then connected to the receiver to use it's crossover and before I disconnected the mains, I noticed a ground hum. I had already lifted the ground on the DSP1124 so I thought it must be the computer. Yep, when I disconnected the soundcard output, the hum went away. So I lifted the ground on the PC and I still had the hum! What I noticed was, even when the PC was off and the cable plugged in, I still got the hum. So I unplugged the monitor and voila!, hum was gone. So I wound up lifting the ground on the PC and the monitor (I'm running out of cheater plugs).
I have uploaded the initial filter, connected the mains and took some more measurements. Since my clipping problem is gone and I can now take reliable measurements, I'll start a new thread with my measurements and (inevitable) questions.
Thank you,
Michael
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