Eclipse ESN E3 High-Power CD Receiver with CDC/E-COM/DSP Control and Wireless Remote Model: 54420 Owner's Manual page 59

How to operate the receiver with an optional DSP/EQ unit connected
Retrieving an equalizer mode from memory
Press a preset button to retrieve the equalizer mode set in
memory for the button.
The buttons that set equalizer modes in memory are called
preset buttons.
1. After pressing the [FUNC] button, hold button [2]
down for more than one second.
2. Press a button, [1] to [6] .
3. Press the [FUNC] button.
The selected equalizer mode will now take effect, and
the EQ adjustment mode will be canceled.
Buttons [1] to [6]
[FUNC] button
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