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AUDIO FORUMS >> Headphones >> Headphone hum eliminator
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Message started by funch on 06/24/19 at 06:09:04

Title: Headphone hum eliminator
Post by funch on 06/24/19 at 06:09:04

I have an SE84UFO amp that I use with headphones, primarily Sennheiser HD800's. I tried several resistor values to eliminate the hum I was getting to no avail. There was always audible hum to various degrees.

Then I came across this page: https://robrobinette.com/HeadphoneResistorNetworkCalculator.htm

I used 5W Vishay/Mills wirewound resistors in the values given at the top of the page: 2R between the +/- and 6R in line with the + as shown in the diagram towards the bottom. This circuit also gives the amp an 8 ohm load, even with no 'phones connected. I use a 4-pin XLR jack instead of a regular 1/4" jack because, well, it's just better.

Result? The hum is 99% gone. Barely audible, with no loss of fidelity.

It works equally well with both low and high impedance 'phones.

FWIW