Some North Korean loudspeakers at the inter-Korean border are pointed toward the North, not the South, a South Korean network reported on Sunday.

Recently, South Korea’s Joint Chiefs of Staff asked for professional advice from a sound engineering researcher as to why some North Korean loudspeakers are facing Northern direction, SBS reported.

The company raised the possibility North Korea may have improvised a new “sound-masking effect” to more effectively dilute the content coming from South Korean loudspeakers.

“The concept of the sound-masking effect is very simple,” a sound engineering researcher told NK News under the condition of anonymity.

“The