com_hunkmegs is linked to com_zonemegs and com_soundmegs
Hunkmegs being the total amount of memory used by the game, so com_soundmegs needs to use a smaller value.
Plus you have to use some specific value: 256, 512, 1024.
At first the game did not need a lot of memory since it has been built to be fast and use a small amount of memory and cpu usage
But Jaymod and Noquarter came out and every server use pk3 made of un-funny and very repetitive sounds which ask questions about the human race.