my he-400 just arrived. after I plugged them into my amp there was a very quick snap-crackel-pop type sound coming from both sides.
is this going to happen every time i plug them in?
also, any advice for someone who's brand new to planar magnetic anything?
If there's no music playing you may have some DC offset on the amp's outputs. No amp is perfect and sometimes they have a little bit of voltage (say +/- tens of millivolts) instead of a pure "zero volts" when sitting idle. That will cause a one-off "pop" when plugging in, otherwise the "crackle" could be just noisy contacts when plugging in. if the "crackling" continues after this, then it could be some intermittent connections in the plug or socket. Try tapping the plug with the blunt end of a pencil (or similar) - you should not hear any effects from this.