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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: jea48 DC on the line to isolation transformer causing hum?

I'm sure there would be a sonic impact if an inline DC blocker is inserted between an AC outlet and an isolation transformer. However, this issue may be dependent on how sophisticated your AC delivery system might be. Additionally, like other filters, sometimes a filter may do more harm than good as a sonic fix. If the interference is only problematic once in a great while, I suggest you consider how important the issue is.

Here's a finished DC blocker with various AC I/O connectivity options (see link below).

The NEMA AC outlet version looks questionable in terms of audiophile performance potential, while the version with I/O cable glands as strain relief might be the better sounding option if the power cord OD is 16mm (0.63 inch) or less. Another option the seller might be able to provide if asked is chassis-mount Neutrik powerCON High Current jacks, which is a very good sounding AC connector/jack interface for an inline AC delivery application that allows the use of a large OD power cord, IME. Otherwise, I look forward to seeing jea48's response.

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