EQ Curve Graphics Display

Inside each Equalizer device is a box marked Graphical Frequency Response.  Clicking on this box will bring up the display window.  The upper part of this window contains the magnitude response (commonly called the frequency response), while the lower portion contains the phase response of the equalizer.  These responses are calculated based on the actual response of the equalizer.  There does not need to be any signal present in order to see a response.

If you click on the display in Control mode, you move the cursor horizontally across the display.  The frequency selected is displayed in the upper right corner, while the level is displayed in the upper left corner of the magnitude portion of the window, and the phase is displayed in the upper left corner of the phase portion of the window.

To change how the response is displayed you must be in Edit mode.  Click on the display so it is outlined in red, then either right click and select Properties, or press Alt-Enter.  A Frequency Response Object Properties window will open.  Under the Graph tab you will see a Layer selector.  It is normally set to Layer 1 so that the response will be shown on top of anything else in the same window.  You will also see a Size section which affects the Width and Height or the Response window.  The size of the Response window can also be adjusted by dragging the lower right hand corner of the window while in Edit mode.

Under the Frequency tab you will find controls for the minimum and maximum frequencies to be charted, and if the horizontal axis will be Log or Linear.  The low frequency limit can be set to any frequency 10 Hz or above and below the high frequency limit.  The high frequency limit can be set to any frequency 24,000 Hz or below and above the low frequency limit.  The default settings are 10 Hz and 24,000 Hz.  Please be aware that there is no audio above ½ the sampling rate in a digital system.  As a result the display will show a straight line above 16 kHz if the sampling rate is set to 32 kHz, or above 22,050 Hz if the sampling rate is set to 44.1 kHz.

The magnitude range can be set to any range from 100 dB to –100 dB.  The max value must always be greater than the min value.

The Phase range can be set to any range from 200 degrees to –200 degrees.  The max value must always be greater than the min value.

The cursor lines and display may be turned on and off with the Cursor checkbox.  The Labels checkbox controls the display of the frequency markings at the bottom of the screen, while the Grid checkbox controls the display of the horizontal and vertical grid lines.  The Phase checkbox controls the display of the phase portion of the display.

The settings under the ID tab should never be changed.