Audio Equalizer от Muyor

Audio Equalizer is a lite add-on that let you easily adjust audio settings (the balance between frequency components in audio file) from toolbar popup.

There are several default audio presets available to choose from in the preset list. For example, you can choose, pop, club, party, soft rock dance or any other preset format for the audio stream. Please note that, you can also define your own format and then save it for later use in toolbar popup. There is also a – reset - button to revert all changes to the factory setting.

Note #1: this add-on has a Mono feature. Mono is an accessibility feature for people with hearing problems (i.e. deaf in one ear). When this feature is active, you will never miss a word or sound when you are listening to an audio from headphone.

Note #2: in order to report bugs, please fill the bug report form in the add-on's homepage.