Bringing this reply from
Skups thread about crackling to create better continuity about Seattle's radio issue.
I replied over there
"Seattle, I just listened to your video's and will share them with the aircraft electronics engineers I work with. Several of them would likely agree that's it's a wire that should have been shielded or some "bleed" over of other signals swamping the audio signal in the harness or at a connector somewhere. The turning the bars static was horrible. Just to verify have you ever found out where the stations are broadcasting from (antenna's not studio) and tested the radio in a fantastic signal area.
I'd agree with you that speakers are not your solution, though better speakers on all factory spyders is some improvement sound quality and volume wise."
They listened to your videos and thought there were at least two different issues and suggested doing some troubleshooting steps to prove/evaluate each issue separately.
1st the nail tapping on glass during Bass beats issue. One Referred to it as audio clipping (as you did above), usually a signal overloading the next component, ie radio to amp, or amp to speaker. Asked if you had manually adjusted the Bass, Treble, or Mid-range response in the radio's settings. Failed/failing component or bad design is likely if your equalizer settings are at the neutral settings and you're getting that at other than max volume. IF your Bass is maxed out or significantly raised in the equalizer, does it happen if you reduce it back to neutral or just above neutral settings.
Wanted to confirm if that same issue happens when you're listening to other audio inputs. Means you'll have to try the AM and or MP3 /USB sourced sound inputs. At least to test if it happens in all inputs or only FM Radio.
2nd the Noise when turning the handlebars or when the Fan kicks in on two different models of Spyders. They were surprised that any vehicle could have that kind of signal noise and pass rudimentary inspection.
We make/repair/modify sport / light plane instrument panel and avionics packages and test all of their audio capabilities (in-aircraft intercom, ac to ground communications, bluetooth and satellite radio before sending a harness/panel/plane out. Both agree that's gotta be some wiring that should have been shielded and isn't or that was shielded but the shielding was not grounded. Short of a complete disassembly to verify all the proper grounds are actually grounding they both agreed it would be terrible to troubleshoot.
Sorry that doesn't help resolve it, but Keep taking it to the dealer and keep the dealer working with BRP.
I am surprised that more haven't complained about this if it's really affecting all bikes.