My center speaker is crackling and the rear speakers are not working at all. The sound card is working properly
Are you using Dell MMS5650 speaker system?
If yes, ensure that the center speaker and rear speakers are connected to sub-woofer and the speaker system is configured appropriately in computer. You may refer to image below :
If the issue persists, please share the system model in use along with operating system installed.
Thanks & Regards,Sundeep B#iworkfordellTo know more about Dell Product Support, Drivers & Downloads, Order & Dispatch status -> choose your region USA;India For helpful Dell Support Videos, you may click Here.