Call of Duty: Black Ops 6 is offering players a third-party audio feature as an add-on for $20, leading to sharp criticism from players. The game comes with an Enhanced Headphone Mode that utilizes technology crafted by a company called Embody. Headset users can further enhance this audio feature by paying for a personalized audio profile.
Is Call of Duty: Black Ops 6s audio add-on pay-to-hear?

Although this add-on is new to the game, third-party enhancements arent new to the world of audio technology. Black Ops 6s standard audio features are more than enough, so those with headsets who choose not to pay for a personalized profile wont experience a negative impact on gameplay.

However, that hasnt stopped players from expressing concerns about the feature. Dubbing it pay-to-hear, players fear that those who fork out the cash may have a slight advantage in a multiplayer/competitive setting.

Players can choose to enhance HRTF [Head Related Transfer Function] exp…

Source: N4G PC Call of Duty: Black Ops 6 Slammed for Paywalled Audio Feature