Electrical arcing is the most likely source of a crackling or sizzling sound. In fact, this sound will sometimes mean that electricity is actively arcing between connections. Royalty-free cable tray sound effects. Buzzing sounds are especially common in grounded outlets, which protect the outlet and device from an electrical surge. But if you hear a louder buzzing sound right as you go to plug. Cable tray sound insulation is essential for maintaining acoustic integrity in professional environments. This is particularly important in studios, laboratories, testing facilities, and interconnected. Download cable noise royalty-free sound effects to use in your next project. The outlet makes a consistent quiet fizzing/crackling noise, but it lets off louder clicks & crackles at random throughout the day.