According to reports, RS invested 100 million baht (US$3 million) and expects a return on investment by year-end.
The entertainment company is looking to attract a potential audience of 20 million.
The channels are broadcast from the Thaicom 5 satellite and can be viewed through C-band and KU-band satellite dishes, as well as cable TV systems provided by local operators.
You Channel will focus on music for teenagers while Sabaidee TV will feature popular music and offer aspiring entertainers a chance to show their talent.
An RS spokesperson said the group has plans to launch more channels in Thailand.