Speaker Boost claims to make your smartphone's speaker louder, but while it may function properly on some devices, it doesn't work on Android 4.2, Jelly Bean. Despite being a seemingly well-made app with a remarkably friendly interface, it doesn't seem to generate any volume boost -- not a noticeable one at least.
Speaker Boost doesn't require any special permissions to run, which is quite nice. When you load the app on your phone you can use a slider to choose how much of a boost you want. By default the maximum is set at 60, but you can change this in the Settings. You can start with 40 percent but can go up to 100 percent if you feel courageous. For testing purposes we tried boosting even to 100 percent, but there was no significant change on our device running JB 4.2. The app didn't make the speaker or the headphones plugged into our phone any louder. It had no impact on the audio volume or quality.
Still, Speaker Boost is a tiny app, and you have nothing to lose if you try it out. Maybe it works better on some smartphones than on others. In our case, though, Speaker Boost just didn't work.
From Omega Centauri Software:
Simple, small, experimental free app to boost your speaker or headphone sound volume. Useful for movies, audio books and music.USE AT YOUR OWN RISK. Playing audio at high volumes, especially for a prolonged amount of time, can destroy speakers and/or damage hearing. Some users HAVE reported destroyed speakers and earphones. IF YOU HEAR DISTORTED AUDIO, LOWER THE VOLUME (but it may be too late).By installing this application you agree that you will not hold its developer responsible for any damage to hardware or hearing, and you are using it AT YOUR OWN RISK. Consider this to be EXPERIMENTAL software.Not all devices support this software. Try it and see if yours works.NOTE 1: This is NOT for adjusting the speakerphone volume in phone calls (that has its own boost, I think), but for adjusting the volume of music, movies and apps.NOTE 2: Users who complain that this does not boost bass are right. In order to mitigate (but not remove!) the danger of damage to small speakers, there is no boost in the lowest frequency range, and there is also less boost in the highest frequency range. If you go to the Settings and uncheck "Non-uniform boost", you get an across-the-board boost, but that's much more dangerous to your speakers.Recent changes:1.05: Option to set maximum allowed boost; higher priority on sound effect1.04.1: Compatibility check1.04: Boost nonuniformly across frequencies1.02: No ad!1.01.2: Remove unneeded permissions; make volume slider hidden by default (except on Fire)1.01: Add menu button for devices without a dedicated one1.00: Initial releaseContent rating: Medium Maturity
1.05: Option to set maximum allowed boost; higher priority on sound effect1.04.1: Compatibility check1.04: Boost nonuniformly across frequencies1.02: No ad!1.01.2: Remove unneeded permissions; make volume slider hidden by default (except on Fire)1.01: Add menu button for devices without a dedicated one1.00: Initial release