# Frequency Resolution

On this page, you select the Frequency Resolution that you want to train on.

![The Frequency Resolution set-up window](/files/t5XF6VPDsVyiEGMdA9DF)

The Frequency Resolution sets the number of possible frequencies that are randomly\* selected and is directly related to difficulty.

**2-Octave Bands** randomly\* selects from 5 frequencies (Easy):

* 63, 250, 500, 1k, 4k, or 16k Hz.

**Octave Bands** randomly\* selects from 10 frequencies (Medium):

* 31.5, 63, 125, 250, 500, 1k, 2k, 4k, 8k, or 16k Hz.

**1/3-Octave Bands** randomly\* selects from 28 frequencies (Hard):

* 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10k, 12.5k, or 16k Hz.

If Frequency was not chosen as a Training Parameter in the previous step, the selected Frequency Resolution will only be used if the Frequency parameter is set to '[Variable](/frequia/advanced-training/fixed-vs-variable-parameters.md)'.

{% hint style="info" %}
\*Dependent on whether [Adaptive Training](/frequia/advanced-training/adaptive-training.md) is enabled.
{% endhint %}


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