Some of android mobiles have problem about sound,it is very less sound in low price mobile.Here is one application for solving this problem.
Open the Android Market application on your device and try to search Speaker Boost Application.Simple, small, experimental free app to boost your speaker or headphone sound volume.
This is a free to use application and has been tried as well but from a security point of view make sure to read the permissions asked by any app
It might show you the change log along with a safety warning. Read it and if you agree accept them to proceed.
If your device’s loudspeaker has ample volume already, do not try to boost it as it might destroy the speaker element.
The application will open up to the main splash screen that showcases the single volume toggle and the settings key underneath it. Select the settings button or key to setup the app for the best possible experience. The next splash screen will open the settings page. Select the Notification bar option to proceed.
By default it is set for always on, but it is advised to select the ‘When active’ option. It will put the notification on the bar when the app is in use otherwise it will hide the icon.
Secondly, go back to the setting and select the maximum allowed boost level option. By default it is at 40; if need be try increasing it in increments of 10 and testing the loudspeaker each time.