Might be of use but I also have a H400 and its internal DC blocker completely gets rid of the hum that plagued my H390 (eventually the Puritan 156 solved that) The H400 is not plugged into the Puritan156 (Hegel says not to use DC blockers with the H400) but I do get this low level pulsating hum that is only heard close to the unit or sometimes when its very quiet. I asked Hegel and they kindly replied with an explanation which was that there are two small toroidal transformers for standby and the pre amp. Apparently these can be affected by high voltage and in the UK some areas have high voltage as a norm. It is not DC offset and they have looked at other types of transformer but they said it affected sound quality. As the hum is very low and sometimes not apparent I am happy enough as it isn't like the H390 and the H400's DC filter works incredibly well.
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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@ richmon wrote:"My solution to the nest of wires (I have the Hegel H20 amp) is to seperate all interconnects and speaker wires from AC cables. I put that black foam pipe insulator with the slit in the middle (cut into several pieces) to seperate all the low power interconnects/speaker wires from AC cables, just slip it over the interconnect and AC cable, cheap and effective." That's what I do as well. Thought I was the only one! Not only does it help isolate all cables and wires on my carpeted floor but, since my speakers are 7 feet from the front wall, they are more visible and my dog and I are less likely no trip over them. Easily visible in my profile picture. Cheers. |
yes the hegel amps can sometimes be susceptible to power line dc and hum... i have used audiolab as well as ava hum-buster units to handle this, which they do well it seems hegel is well aware of this and thus smartly built in such filters into their latest gen units surprised that in the op's case the unit still hums... all i can say is that so many home and work environments have led and other low voltage lighting etc etc all of which throws so much junk into the local power feed |
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