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https://www.lighting-gallery.net/index.php?topic=16487.0

First thing to try is to add a mains filter to your speakers' power supply. Something like this: https://elektrodump.nl/nl/lichtnetfilters/2442-lichtnet-rfi-filter-4a-250vac.html
This one is meant to build into a device. There are smaller ones too, just make sure they at least have a capacitor-coil-capacitor layout.
Make sure to hook the filter up to a grounded outlet, and if your speakers have it, to connect their ground too.
This will suppress the RF pulses that the various inductive loads create.

Before the filter, you want to put a surge protector. This is to short out any high voltage spikes that may be present on your mains, to extend the life time of the filter. They don't last forever.

I'm assuming active speakers with built in amplifiers here, not standard speakers with a separate amplifier.

In general, if literally all lights and the fridge do it, the issue is your speakers being too sensitive. But it's a fact of life that glowbottle starters and inductive ballasts puke out a ton of spikes and RF when starting. That's why many countries have strict RFI rules. If you have a ham radio operator nearby, you can ask them for help - they typically have a lot of experience with RFI suppression.

You also want to verify that the suppression capacitors in your lamps' starters are still in good condition, or that they're even just there.

Thanks for the answers. Apparently, all of my other fluorescent lights make that too.

But now, I came across another interference thing. I recently installed some speakers to my room, and they run on AC power. Basically ALL of my fluorescent lights, INCLUDING the ceiling light, cause interference to the speakers and it can be heard as loud pops. Can that be reduced somehow? Also, once my fridge turns on, a small pop can be heard too.

i’ll update you tomorrow since i don’t have it between my hands now. it also may be a strange tube since the rack were i found it said “85W 150cm” so it may be a strange size but i just assumed it was a mislabeling but i didn’t have time to check whether it’s 180cm or really 150cm (in that warehouse multiple things are mislabeled, such as ballasts labeled as rheostats)

it’s not 1.80m it’s 1.5m 
what kind of tube is this?
here’s it lit on a 65w ballast

last year got a 175 watt MV yard blaster and almost got a roadfocus small from them and they sold the crimefighters as NORMAL stock not surplus as I understand it

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There's a store called Princess Auto here that has a surplus stock section and they seem to get the most random things. I've seen stuff such as LED traffic signal modules, new LED cobraheads there and in the past they've even sold stuff like 175w MV GE Crimefighters, clamshells, gumballs, various other cobraheads.

Anyway I wonder if that's how most people with streetlights in their yard ended up with them, at least here.

 It WAS overactive but thanks to radioactive Iodine it's now underactive .  I'm on the same med . I was told to take it at least 3 hrs. apart from my other meds or food so I take it 1st thing and take my other meds at work at break time when I eat .

 Yeah I don't recommend getting old !!  Not much in the way of options though .    I can't wait to be able to retire ! 

 I'd guess . 

So it literally 'fell off the back of a lorry'...