THE iconic sound of the MCG siren has changed.

If you've been to a game at the home of footy in the past few weeks and thought you were hearing something different, you were.

The MCG is well aware of the difference in the siren's sound to last year, and is trying to fix it.

"The siren at the MCG does sound a little different to that which people have been accustomed," MCC spokesman Shane Brown confirmed to AFL.com.au.

"The reason is that we have had to move from an analog system to a digital one.

"The digital siren does have a different sound, although we're investigating ways to replicate the old sound in the new format."

The change follows a huge upgrade to the ground's two video scoreboards in the off-season, which cost the venue $5million.

The screens are 25.24 metres wide and 13.17 metres high making them approximately 332 square metres in total.

Twitter: @MattThompson