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Hi, After lurking here for a while and giving up on the advice at another forum, I thought I would try asking about a problem that has been bothering me for some time. I am having substantial problems with my cell phone pings being picked up by the headphone cable. I am running a nuforce HDP and HD650s in case someone else has experience with the same problem and setup. So I see a few options: 1) Shielded headphone cables. (Although the price scares me vs option 6) 2) Craft a EMI blocking filter (Perhaps with an inline Neutrix EMC series XLR pair or equivalent), or maybe a ferrite core? 3) A magical audiophile solution I am not aware of. Preferably not involving taping brilliant pebbles to the cord. 4) Move the damn phone. This isn't my favourite option but I foresee the suggestion. 5) Listen to more industrial music so the GSM pings blend in to the audio. 6) Just get a new amp. This would solve some of the other issues I have such as highish output impedance, a crap volume pot at low volumes. If I do go this route is a balanced drive amp my best bet or do some single ended systems have better RF rejection? Thanks for any advice, or just reading this far if you have nothing to say. Brad