Most comfortable listening level

The most comfortable listening level (MCLL or MCL level) is the volume level of the player output that is most corfortable for the subject. The output level can be fixed or the subject can set the level within the limits set by the tester.

Fixed or subject settable listening level

The MCLL.subjectSetsLevel-parameter in the parameter file tells can the subject set the level or is it fixed. If set to true, the subject sets the output listening level. If false, the output level is fixed. Here is an example:

   # Subject sets MCL level
   MCLL.subjectSetsLevel=true

Default or fixed listening level

The default of fixed listening level is set with the MCLL.default-parameter. If subject can't set the output level, the level is used as the output level. If subject can set the level, this parameter tells the default or initial volume level that is set as the output level when level setting procedure starts.

An example to set fixed/default output level:

   # Default output level is -25dB
   MCLL.default=-25dB

MCL level limits

The available MCL level range for the subject can be limited with the MCLL.min and MCLL.max parameters. The limits also apply to the default/fixed output level. Here's an example:

   # set the available output level range to [-60, 0] dB
   MCLL.min=-60dB
   MCLL.max=0dB

Notes

Some notes about MCLL setting.

The maximum level that can be set generally shouldn't be greater than 1.0 (100% or 0dB), overflows may occur (depends on the nature of the samples used).
Some tests may change the MCLL limits or defaults set in the test parameter file.
In earlier version of GP there had to be a controller component named 'mcll' in the subject UI to be able to set the listening level. The component doesn't have to (should not) any more be added to the controls list. Level setting works now for all tests. The 'mcll'-controller's parameters can still be used to customize the look of the listening level setting dialog.

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Last modified: Mon Jul 20 16:37:14 EEST 1998