Did you know that you might not be hearing what your music really sounds like? If you are using normal computer speakers for your music applications, you aren't hearing the real thing! A good pair of studio monitors, like the MA-15D by Edirol, are critical when creating and listening to music, therefore reproducing the music without colouring the sound. The MA-15D's offer a built-in Bass Enhancer, which operates on psychoacoustic principles that convert low frequencies into a series of over-tones which the human ear cannot distinguish from the original low frequencies. This allows the listener to perceive bass frequencies outside of the normal range of the speaker cone, without over-driving the woofer. You can also connect two different sources directly into the MA-15D's, allowing you to listen to audio from any two line-level sources. Like the other MA models, these speakers also include a digital input, meaning you can keep your audio signal in the digital realm until the very last moment.