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.