I like to have a pretty bright tone. I get this by playing Jazz-style basses into a Darkglass B7KU into a Hartke HA3500 head and Ampeg 410HLF cab. I like my tone, but I've noticed an issue where a shrill frequency comes though the cab. When it happens it causes a lightbulb behind the speakers to light up, which according to Google means that you're close to blowing the speakers, which I don't want to happen. I've tried to reconfigure my setup plenty of times to make this stop happening, but eventually an errant pick scrape or something will make the cab light up like a Christmas tree. What's even more confusing is that I don't feel like I have that much high end dialed into my tone - I have treble at noon and drive and hi mids (3Khz) at 1:00 on my Darkglass, and on the Hartke my high pass filter is at noon and my graphic EQ is flat, except for a slight dip at 30Hz and a sharp cut at 8Khz. The tweeter on the cab is also kept off at all times, and I'm using roundwound strings on a passive bass but they're not exactly brand new. I also have volume on the amp at around 3, and the input light on the amp stays solidly green. Anyone have any insight, maybe an idea which frequency is causing harm to my cab? I'm thinking about replacing the speakers with neodymium speakers to reduce the weight of the cab, would they be able to handle it without freaking out? This has been bothering me for months and I'd like to nip this in the bud permanently.