Would you describe it more like an electric humming (think AC) or is it actually crackling?
If you do you hear a very annoying persistent crackling sound then it’s not intentional. I saw some play testers having the same issue, and it seems to resolve on its own after a few refreshes.
I thought it was caused by a specific low frequency sound and I removed it, but looks like you’re having the problem as well.
I’ll investigate the issue. Thanks for reporting it!