Roland EDIMA7A MA-7A Analog Desktop Monitors The MA-7As feature a built-in Bass Enhancer, which operates on psychoacoustic principles that converts low frequencies into a series of overtones the human ear cannot distinguish from the original low frequencies. This allows the listener to perceive bas frequencies outside of the normal range of the speaker cone, without overdriving the woofer. With the Bass Enhancer, the MA-7As provide a strong low-end in a very compact set of reference speakers. In addition the MA-7A's offer a Sub Out port to connect a subwoofer. The MA-7As offer conveniently placed Volume and Tone controls. Adjust the volume and tone directly from the front of the speaker. While a large studio setup typically uses a mixer to control output level to the speakers, compact desktop setups can rarely afford the space a mixer requires. This is not an issue with the MA-7As. You can adjust your output volume and tone on the front of the speaker. You can also connect two different sources directly into the MA-7As, allowing you to listen to audio from any two line-level sources. For example, you can have both your computer and your stereo connected to the MA-7As. You can also plug headphones directly into the MA-7As. Plugging in headphones automatically defeats the speakers, allowing you to mix without disturbing others, and without having to disconnect anything in your setup.