Eclipse ESN E3 High-Power CD Receiver with CDC/E-COM/DSP Control and Wireless Remote Model: 54420 Owner's Manual page 56

How to operate the receiver with an optional DSP/EQ unit connected
5. Push the [FUNC] button.
Retrieving a preset pattern from memory
Press a preset button to retrieve the room size in memory.
The buttons under which room sizes are stored in memory
are called preset buttons.
1. After pressing the [FUNC] button, hold button [1]
2. Press a button, [1] to [6].
3. Press the [FUNC] button to cancel the DSP
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The adjustment mode will be canceled and the
selected room size will now take effect.
down for more than one second.
The room size, as preset in the button, is retrieved.
adjustment mode.
Buttons [1] to [6] [FUNC] button