Apps like Polarity Checker

Here are some great alternatives to Polarity Checker by DWA ICT Solutions :
Volume booster Sound amplifier
Volume booster Sound amplifier
★4.3
Audio Analyzer
Audio Analyzer
★4.4
Volume Booster
Volume Booster
★4.5
Subwoofer Bass test
Subwoofer Bass test
★4.1
Hifi-Apps Speaker Setup 2
Hifi-Apps Speaker Setup 2
★4.4
Volume Booster - Sound Booster
Volume Booster - Sound Booster
★4.5
Sound Booster・Increase Volume
Sound Booster・Increase Volume
★4.6
Speaker Check: Sound Problems
Speaker Check: Sound Problems
★3.6
Equalizer & Volume Boost
Equalizer & Volume Boost
★4.6
Equalizer & Volume Boost PRO
Equalizer & Volume Boost PRO
★4.6
Speaker Tester & Cleaner fix
Speaker Tester & Cleaner fix
★3.4
Hifi-Apps Subwoofer Optimizer
Hifi-Apps Subwoofer Optimizer
★4.1
Extra volume booster Maximizer
Extra volume booster Maximizer
★4.5
Earphones Test+
Earphones Test+
★4.1
Volume Booster Speaker Booster
Volume Booster Speaker Booster
★4.7
Sound Frequency Analyzer
Sound Frequency Analyzer
★3.3