X03 LC Audio Crystal Spec Question

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Hi I'm wanting to change a crystal in an LC Audio XO3 module from 16.93Mhz to 33.8668Mhz to suit a different player. I realise it needs to be 5ppm or better accuracy.

However should the crystal be fundamental or third overtone? I believe it should be fundamental.

Before I order, could someone please confirm???

Many thanks....!
 
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