2. digital
  3. 127383-506

Filter tweak for digital backwash?

As my system improves, it’s easier to hear anomalies. The search is now on for a tweak to filter only digital backwash in my AC. The culprit is the regulated transformer power supply (120vac/19vdc converter) to the dedicated laptop for streaming.

The balanced power conditioner has separate outlets for analog and digital. The digital outlets already have built-in filtration for backwash. They work well. But, I need even more. When the laptop is running on its internal battery, the music is very smooth. Unfortunately, the battery life is short. When the laptop is running on the power supply, there’s a slight stridency. When the power supply is plugged in anywhere else, there is huge stridency. So, I’m looking for some gizmo to clean up the digital backwash in-between the conditioner digital outlet and the power cord to the regulated power supply.

I’m not looking for an overall line purifier. The balanced power conditioner does a pretty good job already. Any suggestions?


steakster
georgehifi's avatar
georgehifi
10,312 posts
 
I thought it was pretty easy to deal with noise injection(?)
Not when smp is involved.

Cheers George
gdnrbob
4,447 posts
 
Georgelofi, smp meaning ' Symmetric multiprocessing', or am I missing something?
Bob
erik_squires
16,138 posts
 
SMPS = switch mode power supplies.
erik_squires
16,138 posts
 
randy,

Good question! :) I think in part it's because reviewers baby them during testing. :)

Erik
georgehifi's avatar
georgehifi
10,312 posts
 
I thought it was pretty easy to deal with noise injection(?)
It was 10 years ago, we had relatively low levels of noise to deal with. Today now we have designers making new things, like Class-D, Delta Sigma converters and SMP(S) (sorry Bob), that introduce even more complex noise structures and with much higher output of those noises, now these have to be dealt with as well. Without effecting the core body of the fundamental that we hope should not change "the music and it’s harmonic structure".

Cheers George
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