Static popping and buzzing sounds come from the speakers when the car is running. The Radio is not turned on and it will continue for a long time, quit then start again as you are driving.

Is this a factory radio

It sounds like the radio is defective. I can think of no other issue that would cause the speaker noise you discribe

Buzzing sound through speakers with vehicle running or not running?

'03 G35 Radio Problem. Speaker Noise Even When RadioTurned Off ...

g35driver.com/.../437164-03-g35-radio-problem-speaker-noise-even-w...
Feb 1, 2014 - Turned entire car off/on several times, no change. ... Still had the static/crackling type noise from driver rear speaker at all times - even with ...

easy check to carry out ,borrow a speaker that you know works, if you remove one from another vehicle make sure ignition is off when taking speaker out, take a speaker out from your vehicle ignition off , the door speakers are usually the easiest to remove,plug in the known good speaker to your vehicle turn ignition on then radio, if you get sound then the problem is with the speakers but very unusual for all speakers to blow at the same time unless there has been a power surge through the amp. if no sound still remove radio and make sure the wire connectors are pushed home securely if they are then it's most likely the radio is not working will need replacing as a repair can be more expensive than new

direct short take to specialist

nevr go to a dealer--inxperiencd techs--sounds like the capacitors are worn----go to a radio shop

hi Scott, sounds like feedback try earthing your radio to the bodywork.
good luck Scott Craig

sound like a grounding issue

speaker wire crossed sum wear ok