Audiophilepure

https://www.headfonia.com/hifiman-ef400-review/

As promised in the product sheet, the HiFiman EF400 is absolutely dead silent, even with super sensitive IEMs like my Onkyo IE-C3, or the FiiO FD7. To be sure, I tried various sources to check if EMI shielding was okay too and 99% of the time, I was pleased to hear the same pitch-black background. As I said, I had some parasites, but those were not ground-related, and once I rebooted the device, everything went clear.

Last but not least, I did some comparisons between the single-ended ports and the balanced one. The brand recommends choosing the 3.5mm and 4.4mm Pentaconn to drive high-sensitivity in-ears, and stick with the 6.35mm and XLR 4-Pins for low-sensitivity headphones. So I did the opposite, see how the amp behaves, and… quite frankly, it works well.

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