Help! How to use a D250 as ONLY a Preamp

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The pre-out option in the speaker section of the configurator allows you to configure different filter options for the main speaker outputs depending on whether the pre-out is enabled or disabled. For example, when the pre-out is used to drive a sub, you can high-pass filter the speaker output when the pre-out is enabled, but have full-range output to the speakers when the pre-out is disabled. This is helpful when the pre-out is enabled or disabled by a button on the remote control.

In short, this part of the speaker configuration in itself shouldn't affect what the pre-out is doing.