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However, if the switch is engaged at a high volume you're really messing stuff up. Our ears can then perceive a more accurate representation of the original song even when it's quiet. Now you understand why this feature is quite handy when you're playing stuff at a lower level. When you engage the Bass Boost button on a system it gives a little EQ boost to the low and high end of the material it's processing. Remember from above that at low volume levels we don't hear the low end and high end as well. It's supposed to be used when you're listening to music at lower volume levels. Now that we know a little bit more about how our ear's hear we can get back to the Bass Boost button. If you can't have a normal conversation over the music it's most likely over 83dB. 83dB is said to be the ideal monitoring level to take advantage of the most accurate level of our ears perception. Long Story short, when it's quiet you don't hear the bass and highs, when it's loud the bass and highs are so loud they drown out the mid-range. At high volumes the ear picks up on the low end and high end of the frequency spectrum with much more intensity than at lower volumes.
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Conversely, at high amplitudes, we hear the mid-range with less accuracy. Communication is how we've been able to get to where we are as a species and our ear's perception of sound is just another confirmation of this thought. This is because we've evolved to hear human speech which lies in the mid-range of the frequency spectrum. At lower amplitudes(volume) the human ear picks up on mid-range frequencies much better than it responds to low and high frequency information.
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It's purpose all ties into the Fletcher Munson Curve and how the human ear perceives sound. right? (remember though, louder is not better) I'm about to tell you the actual purpose of the Bass Boost button or switch in some cases, you'll realize why it shouldn't be used all the time and furthermore, why it's specifically designed for certain listening situations based off of the way our brain and ears work together! Sounds fun right? Boost bass, f***ing a! We're all about that these days. It's most prevalent in aftermarket car stereo head units, boom booxes & self powered PA speakers. We've all seen it, the infamous "Bass Boost" button.