yeah same here. crap lol
Bottlehead Crack interference - Page 2
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There are also much cheaper isolators available, you can find various models for as low as $10 on amazon.com. Of course, these are much more likely to have an audible effect on the sound (especially the bass can be degraded by cheap transformers), but if you really cannot just use the STX built-in amplifier for now, then you could give one of them with good consumer feedback a try.
It is basically like a cheater plug, but with the ground connected through diodes. So, when there is only a small voltage (e.g. interference) on the ground, it is lifted, but when the voltage increases because of a problem, the diodes will conduct and let the safety ground work as intended. Not sure if this is entirely as safe as a real grounded plug, but it is better than a simple cheater plug.
Guys, I just ordered the Hum-X off of Ebay. It is surprisingly expensive, and one would think you should be able to find a similar consumer electronic product for much less. Anyway, I just wanted to obtain updated feedback from both meeklo062704 and xero404. Did the Hum-X device work consistently, did the humming come back, did you eventually find a better alternative? I have a PC -----> USB -----> DAC -----> Bottlehead Crack chain that's experiencing similar problems to what you had.
So now I'm running flax->j-river->schiit bifrost->crack->hd650, and an completely. Or as satisfied as I'll be until I get the itch to upgrade something.
I will be having someone install replacement transistors in a couple of weeks. He will also take a look at some of the possible causes of the ground loop problem. I will have him explore that possible solution. In the meantime, in spite of the hum, the music sounds glorious.
But you are correct, it is glorious. I had a power spike come through and mess up a driver on my hd650s. It's really faint, and is usually only audible with deep bass on low volume. But that's what I get for being inpatient about the kit waitlist and buying one used already assembled. The sound does spoil me though. I couldn't stand my earbuds anymore and talked myself into buying some Westone 4r's. Almost as good, just not quite there.