I think that's a similar model to one I returned for being wildly unacceptable for electrical and audible noise at all power levels. I had a look inside mine but not a lot could be done to improve it - already had snubbers etc (resistors of which were getting rather hot even at low power, so reasonable fan speed was needed). A shame given the price, reasonable build (though not design) quality and other features.
Edit: checked amazon history and yes, the one I got is a "SPE6103" - the 60V version. If it were me I'd send it back, but you will know your use case better than me, might be fine for some tasks where noise isn't an issue. Also added a scope cap to demonstrate the scale of the issue.