Not surround sound-Makes sound crappy. – Boom: Bass Booster & Equalizer Review

To be blunt, this is not surround sound. What this app does is it takes the already two channel sound from your head phones, splits it farther apart by panning the sound slightly to each side, and separates the lows, mids, and highs into little speaker icons so that you can "change" your headphones into "surround sound". This ends up sacrificing the quality of the sound quite a bit as it give a hollow and stretched feeling to the song, but they add EQ presets and an "intensity" setting to mask it. The intensity adds more bass to the mix, and takes up a lot of the empty space created by this channeling of the music. The intensity is the only nice feature, as it makes the bass really pop - it still kills the quality of the song in the end though since it drowns out a lot of the other frequencies. In the end, nothing is "surrounding" or 360 about this audio. If you want more bass and stressed frequencies, then you can pay to have it after your trial for the app runs out. If you want the quality of your music to stay intact or even improve while still being able to hear all the frequencies, just stick with your music library and get some quality headphones.
Review by UltraSynth3 on Boom: Bass Booster & Equalizer.