The hum is most likely coming from the transformer inside the amp. I use to hear it in my H390. Got a DC blocker and the hum went away. Since grounding the outlet the amp was plugged into I don’t hear any hum. I think what you are hearing is normal. I just purchased a Electrocompaniet intergrated and if I get very close to it, I can faintly her a buzz coming from it. No worry.
Hegel hum?
Spent a week or two enjoying my new H400 and noticed a faint hum between the time I turn it on and before I play music. Also there when I pause after playing a while. Note that the hum is only apparent when I bring my ear a foot away from the amp. I’m quite pleased otherwise but am wondering if this is normal?
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My Hegel H590 has a normal, cyclical, mechanical, ever so slight hum. In over 25 years in high end audio, I've never owned an amp, whether it be tube or SS, that didn't have some kind of a hum. Some hums extremely slight, and some more noticeable. With my Hegel H590, the barely noticeable humming sound cycles out after a few minutes. |
hum out of speaker indicative of ground loop hum out of box indicative of DC offset causing toroidal vibration hums are annoying. You might try a DC filter ...ala, https://avahifi.com/collections/accessories/products/humdinger-dc-line-blocker |
Props to all who responded above. Very thoughtful and correct advice. If you’re not hearing a hum/buzzing from the speakers your concerns should be minimal. The Hegel integrated amps don’t turn off/on. They switch between standby (very low power consumption) to on (full power & ready to rock) When transitioning between standby and on the system will fully saturate with current. In so doing the first thing in the chain which is that large transformer will charge up. Charging up is a physical process where the transformer’s copper wires wrapped around the core can micro-vibrate and can cause noise (hum). This process should stop and the unit should be very quiet after warm up. If the hum persists, then as described by the proper comments above, there is some order of DC imbalance. If you’re not hearing it from the speakers and can’t hear the physical hum from the amp at your listening position does it matter? I hope you enjoy your listening experience. |
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