Airport/iTunes loud static burst

I have an airport express set up to play iTunes. Occasionally when switching tracks I get a really powerful static noise burst, it's deafening. Imagine you have a receiver, you switch to a station with nothing but static, mute the channel, turn the volume all the way up, then suddenly unmute it. Thats what it sounds like. It's happened maybe thrice in the past 3 months. I'd like to fix this because I'm worried this burst is loud enough to damage the speaker. Any suggestions or solutions would be appreciated. my setup itunes>optical>DAC>power amp.

Does the noise burst still occur if you substitute a pair of stereo headphones into the audio port of the AirPort Express? If so, then the issue may be one of three things: 1) Audio source, 2) The power source the Express is connected to, or 3) The Express itself.
If it doesn't then the issue may be: 1) The digital optical audio cable between the Express and the DAC, 2) The DAC itself, 3) The analog audio cable between the DAC and the power amp, or 4) The power amp itself.
One known issue with the Express is that it doesn't have a local clock circuit. As such, when the incoming data is interrupted, as it is when you change songs in iTunes, there is no longer a digital output to feed the DAC, which loses lock as a result. Some external DACs are more sensitive to this than others.

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