Shortly after he took office in June, Lee's administration switched off propaganda broadcasts criticizing the North Korean regime as it looks to revive stalled dialogue with its neighbour.
But North Korea recently rebuffed the overtures and said it had no interest in talking to South Korea.
The countries remain technically at war after the 1950-53 Korean war ended in a truce and relations have deteriorated in the last few years.
South Korea's dismantling of the loudspeakers from Monday is just a "practical measure to help ease tensions between the South and the North," the ministry said in a statement on Monday.
(Reporting by Ju-min Park, Joyce Lee; Editing by Ed Davies)
A general view over the Demilitarized Zone (DMZ) on the border with North Korea in Cheorwon, Gangwon Province, South Korea, 24 July 2018. South Korea's Defense Ministry said it was pushing for a plan to withdraw forces and equipment from border guard posts 'on a trial basis' in line with the April inter-Korean summit agreement to halt all hostile acts and reduce tensions. EPA-EFE/YONHAP SOUTH KOREA OUT 