Mix Matrix Operation

The DMP 64 has a primary mix matrix and a secondary mix matrix to configure mix-points. The primary mix matrix connects mic/line inputs and virtual bus returns to line outputs, while the secondary mix matrix connects mic/line input and virtual bus return signals to the Virtual Bus Sends.

See the Mix-point Gain section for more information regarding Mix-point dialog box components and mix-point gain.

Primary Mix Matrix

The DSP architecture contains a primary mix matrix that connects the mic/line inputs and virtual bus returns to the line outputs. The main workspace of DSP Configurator provides control of the primary mix matrix, which is used to set mix levels from the inputs and virtual returns, post-input processing, to each of the mono line output busses.

Each of the six mic/line inputs and four virtual bus returns is connected to a mix-point for each of the four line outputs. In general, mix levels are set relative to each other, achieving a desired blend of input signals at an optimal output level. The optimal output level is close to but not in excess of 0 dBFS at the Line Output Volume block level meter (while accounting for processing that occurs at the line output signal chain).

Mix-point behavior is as follows:

• No mix information - A faint gray circle indicates that the mix-point exists but does not contain any mix information (the mix-point is muted).

• Mix information - A solid teal circle indicates that the mix-point contains mix information (the mix-point is unmuted).

• Mouse-over - When you hover the cursor over a mix-point, the cursor changes to a hand tool.

• Single-click - A single click brings focus to (selects) the mix-point. This is indicated by a dark green outline around the circle.

• Double-click - Double-clicking the mix-point opens the mix-point dialog box. The focus outline becomes light green for an open dialog box.

• Multiple open dialog boxes - When multiple mix-point dialog boxes are open, the mix-point for the most recently opened dialog box has a light green outline. The previously opened dialog boxes do not have a focus outline.

Secondary Mix Matrix

The DSP architecture contains a secondary mix matrix that connects the mic/line input, and Virtual Bus Return signals to the Virtual Bus Sends. DSP Configurator provides control of the secondary mix matrix, which is used to set levels from the post-processing input and Virtual Bus Return signals to the Virtual Bus Sends.

Each of the six mic/line and four virtual return inputs is connected to a mix-point for each of the Virtual Send busses. However, Virtual Bus Return A cannot be routed to Virtual Bus Send A and Virtual Bus Return B cannot be routed to Virtual Bus Send B, and so on, to prevent feedback loops. Each mix-point is muted and set to 0.0 dB (unity gain), by default. In general, mix levels are set relative to each other, achieving a desired blend of input signals at an optimal level.

The secondary mix matrix contains a section that allows Virtual Bus Returns to be routed back to the secondary matrix. To prevent feedback loops, a virtual channel is prevented from being routed back to itself by eliminating the mix-point that routes a bus to itself.