It is likely that your compter is running out of time to service the audio interface. You need to turn off wireless connections, turn off all Anti-virus and antispam and anti popup software that might be running. You are probably getting underun errors.
When data is missed due to insufficient processor power/timing, this causes the sound to break up badly.
Try hooking headphones to the output and see if the crackling is still there.
then, try it with the speakers, at a lower computer voume level and higher speaker volume level. perhaps the headphone output is too loud and distorting in the speaker inputs.
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