Technology Guide
7
Microphone Input
The signal goes from the XLR input into a premium-quality preamp with a pad, which provides over
74 dB of gain range (including the 20 dB pad). From there, the signal goes to a high-pass lter, which is
controlled by software via a high-quality relay. Then the signal passes to an insert jack on the back of the
interface, so the user can send to external devices, and the return will come in through the same insert.
Line Input
The Mbox Pro interface is specically optimized for desktop recording scenarios, where a user is likely to
leave the line inputs plugged in at all times. A Front/Rear switch enables the user to choose between the
preamp signals or line inputs on the back of the interface. The signal from the line input does not pass
through the preamp; instead it connects directly to the converter, ensuring that the sound is not colored
in any way. The line input features a +4/-10 switch so a user can switch between professional- and
consumer-level signals.
Then, users have the option of passing the signal to the soft-clip limiter, which features the same
technology as our top-of-the-line Pro Tools|HD 192 I/O audio interface, enabling users to track
extremely hot signals without overloading the inputs and clipping. Finally, the signal feeds directly to
the premium-quality A/D converter, which delivers world-class performance.
Instrument Input
The instrument input follows the same path as the microphone input, and thereby benets from the same
wide gain range and control via the gain knob. The instrument input is optimized to cover a wide range
of signal strengths and output levels (passive and active guitars, etc.). The dynamic range and distortion
specs are dramatically improved compared to the previous generation.
Mbox Signal Path