Volume Maximizer is a Mac app that includes various sound utilities.
Download on the Mac App Store

Alternative apps

eqMac
eqMac
FREE
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Improve the quality of your listening experience with this equalizer.

Stellar Volume Repair
Stellar Volume Repair
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Repair corrupted volume information on Mac.

Xmart Volume
Xmart Volume
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It performs automatic volume control using the microphone of your Mac or iSight.

Sound Booster
Sound Booster
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Boost the sound volume of files, apps or the whole system.

Volume Slider
Volume Slider
FREE
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Volume Slider allow you to control your computer's volume using a slider