Multi-Sub Optimizer Tutorial (page 5)

Adding Filter Channels

MSO does not have preconfigured setups for specific DSP hardware. Instead, you tell MSO how many filter channels your hardware has by adding filter channels in the Config View. To add filter channels, click the Config View tab at the lower left of the main window and locate the Subwoofer Channels folder icon. Right-click on it and choose Add Filter Channel from the context menu. This will create a new filter channel called Sub Channel 1. Repeat this process three more times to create the filter channels Sub Channel 2, Sub Channel 3 and Sub Channel 4. You have just created four subwoofer channels, one for each of four subwoofers. You set up the filters you want by adding filters to each of these channels. Before you do that though, you need to add a channel for the main speakers, even though you may not be using MSO to EQ the mains. The reason for this will be explained shortly. Right-click the Mains Channels node and choose Add Filter Channel from the context menu. This will create a new filter channel for the main speakers called Mains Channel 1. When done, the results should appear as below.

Filter channels added
Figure 8. Filter channels added

Adding Filters to Filter Channels

Now you'll add a parametric EQ to Sub Channel 1. Click the Filters folder icon under Sub Channel 1. Right-click and choose Add Parametric EQ. You'll see a new icon labeled FL1:Parametric EQ under Filters, which is under Sub Channel 1. Click on FL1: Parametric EQ to select it.

When a filter is selected in this way, the Properties window on the right side of the main window will show information about the filter, its parameter values, and the upper and lower limits of permissible values of each parameter. This is illustrated below.

Properties Window
Figure 9. Properties Window

The first group of properties is Filter Information. You can't alter any of the Filter Information values as their purpose is just to identify the filter, its type, and other information about it. Below Filter Information are the parameters, their names, values, and the upper and lower limits of those values. Only the information in the right column can be changed. You can change the values themselves in the right column by editing them as you would in a spreadsheet. In addition, when you click in the right column of the Value field, a spin control with up and down arrows appears, allowing you to tune the value by pressing either of these two arrows.

The Optimization allowed field controls whether the optimizer is permitted to alter the value of the parameter. If set to False, the parameter will retain the value set in the Properties window and won't be changed by the optimizer.

Notice the Maximum value field of the Boost (dB) parameter has a value of 0 dB to disallow boosting. This is only an initial maximum value as a safety feature for some DSP hardware that might have dynamic range problems when boosting is done. You can manually edit the maximum value of the boost to be up to 15 dB, which is likely to be much more than you'd ever want to use. You can also set the default minimum and maximum values of newly-created filters of all types. You'll look at that next.