High Frequency Oscillation hurt resistors in Magico A5 crossovers


Hi,I am looking for help understanding how HFO could blow crossover resistors in Magico A5 speakers. Equipment playing at the time of the incident is as follows...
Magico A5 speakersHegel H30 mono blocksHegel P30 preamp (lt and rt inputs on the Aux inputs from the laptop and Dragonfly Cobalt)
Dell laptopAudioquest Dragonfly CobaltAmazon Hi-res streaming
I was listening to Amazon music at a very moderate level when the application said there was an update available.I instinctively clicked accept while music was paying. It was only off for a few seconds to update and when complete and I restarted music the A5 tweeters were not on. These happened simultaneously and there was no audible noise what so ever indicating a potential issue. After multiple source tests and tweeter test, I was certain the tweeters were fine and it was an electronic issue. The cross overs were removed and sent to Magico and that was when I was told that HFO blew the resistors.
Can anyone explain how/why this happened so I can ideally avoid it happening again?
Thank you!
128x128howaanders8

Showing 1 response by kennyc

Magico is technologically driven so it’s likely that it’s not the speaker’s faulty design but rather the HFO caused by an external source - also likely caused by running the update while having the speakers engaged.

Seems like the OP has the solution - don’t do software updates while the speakers are engaged - likely a good idea/lesson for us all. But unless the OP has a deep technological curiosity, seems like a potential fruitless rabbit hole to further track down the source of the HFO. I’d expect minimal/no incentive for component manufacturers to spend time/effort to assist you in this endeavor.