How to Connect a 2-Wire Speaker to a 4-Pin Motherboard Socket


Desktop computers typically contain small speakers that generate system sounds such as warning beeps and boot noises. These speakers connect to the computer's motherboard by plugging in to a small socket or series of pins. Whether you're building your own computer or replacing a blown speaker, you may find that the speaker has only two wires while the socket contains four connection pins. It's still possible to connect the speaker to the motherboard, but you need to use the right pins or the speaker won't function properly.

Things You'll Need

  • Phillips screwdriver
  • Flashlight
  • Anti-static strap (optional)
  • Turn off and unplug the computer. Press the power button after the computer is unplugged to discharge any residual electricity that may be stored in the computer's components.

  • Locate the screws holding the left side panel in place. On most cases, there are two screws, although some computers may have more, and they are located on the back of the computer case. Remove them using a Phillips-head screwdriver. Slide the panel off and set it aside.

  • Examine the motherboard and locate the speaker socket, using a flashlight if necessary to identify the socket labeled "Speaker" or "SPKR." The label should be printed on the motherboard itself. The socket should be located near one of the edges, likely near similar sockets for items such as the hard drive indicator light, the power button and the reset switch.

  • Attach the wires to pins 1 and 4 -- the two pins on the outside -- by sliding the connectors on the ends of the wires over the pins. Each wire can go on either of the two pins, as long as only pins 1 and 4 are used.

  • Replace the left side panel on the computer case and secure it with the screws that you previously removed. Plug in the computer and turn it on. The computer automatically recognizes the speaker before the operating system boots, so no software installation is needed.

Tips & Warnings

  • Take care when working inside the computer because static discharge can damage critical components. Wear an anti-static strap or maintain contact with a metal portion of the case while connecting the speaker to prevent static discharge.

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  • Photo Credit RAW_group/iStock/Getty Images
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