28 Great Audio Apps for Android, Apple

SpeakerTest by Dustin Baerg & Dynamark Media If you need to run a quick and easy speaker system check, SpeakerTest, from Dynmark Media and designer Dustin Baerg, is your solution. Download this app, select your tone of choice, connect an audio cable into the headphone jack and play the test tone. The app allows you to check system performance, as well as left and right isolated signals.