Mbox 2 Overview and basics S/PDIF LED This LED indicates that Mbox 2 is using the S/PDIF inputs as the clock source. USB LED The USB LED indicates that the Mbox 2 has received power from its USB connection. Once the USB light is on, audio can pass in or out of the system. Front Panel Headphone Output Use the Headphone Output to connect stereo headphones with a 1/4-inch stereo mini connector. Headphone Level The headphone knob adjusts the output level of the Headphone port, which outputs the signal that is routed to Outputs 1-2 in Pro Tools LE, and mirrors the Line Outputs.
Mbox 2 Overview and basics Monitor Level The Monitor knob adjusts the output level of the Line Out ports. In Pro Tools, this will be the signal routed to Outputs 1-2. Mix (Ratio) Control Mbox 2 gives you the ability to monitor your analog input signals while recording, without the delay incurred by A/D/A converters and host- based processing. This zero-latency analog monitoring is con- trolled with the Mix knob, which you can use to blend and adjust the monitor ratio between Mbox 2 analog inputs and Pro Tools playback. The Mix knob has no effect when you are using S/PDIF digital inputs, since it controls the signal before it reaches the A/D converters. To listen to just the Source input signal, turn the Mix knob fully left to Input. To listen to Pro Tools output only, turn the knob fully right to Playback.
Mbox 2 Overview and basics Mono Switch and LED The Mono switch sums the input channels to a mono signal (delivering that identical signal to both speakers). This has no effect on Pro Tools playback monitoring, recording, or on the main outputs. Switching your stereo source signal to mono is useful when you are recording a mono input while listening to stereo playback (to hear your playing in both sides), or for checking the phase relationship of stereo inputs. When engaged, the Mono LED lights. 48V Switch and LED Phantom power is activated by the switch labelled 48V on the front panel of Mbox 2. The LED, when lit, indicates that 48V phantom power is active on the Mic/Line inputs. These inputs provide phantom power for microphones that require it to operate Pad Switches and LEDs The Pad switches engage a -20 dB pad on their corresponding input channels. When engaged, the Pad LEDs light.
Mbox 2 Overview and basics Source Selectors and LEDs These switches select either the Mic or DI inputs for each channel. The DI and Mic LEDs indicate the current source input. Peak LEDs These LEDs are clip indicators. If the Peak LEDs flicker occasionally, the signal reaching Mbox 2 has clipped. Gain Controls These knobs adjust the input gain levels of the Mic/Line inputs.