Epson ActionPC 2000 Read This First Manual page 43

Because your computer's sound card will supply power and
amplification to the speakers, you must do the following before
you connect them to your system:
place it in the Off position
to the Off position to turn off the speaker's amplifier.
Do not press either speaker's power button or change the
setting of the Amp switch as long as the speakers are
Both speakers are connected to one speaker cable. Connect this
cable to the speaker port (SPK) on your computer's sound card,
as shown below. (If you have a desktop computer, the card is
installed horizontally.)
or joystick
Port
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