Thanks for the exclusive news bhaskarkilli Bro.
HD+Nice exclusive share bhaskarkilli bro, which HD STB u got with ur connection.
Mine is also the same, a Huawei one...
In ADTV STB box got to menu option and click setting,Users settings,audio in audio if you are using Optical option then choose in SPDIF audio would be DD,if you are using HDMI then choose DD or DD+ audio.Home theater settings depends on brands.what shud be the default settings to get good audio in both airtel box and also in home theater. can u please send snap of both ur home theater audio settings and airtel audio settings?