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Headrush FRFR-108 distorting after amplifying bass via Positive Grid Spark 40

My Headrush FRFR-108 is damaged after I ran a summing cable into it from the headphone output of a Positive Grid Spark 40. It distorts at any volume over 6 when I play a bass guitar through it.

I had it cranked up to max while rehearsing with the band and a loud drummer.

How can I tell if the tweeter or the woofer needs replacing?