Why 4 pins for the speaker connection on motherboards?

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Discussion Overview

The discussion revolves around the design choice of a 4-pin speaker connection on computer motherboards, exploring both technical and historical reasons for this configuration. Participants examine the implications of this design in relation to typical speaker connections and their functionality.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the necessity of the 4-pin connector, noting that many speakers and headphones typically use a 3-contact configuration for stereo sound.
  • Another participant explains that the inner pins of the 4-pin connector serve as a "key" pin and ground pin, which prevents incorrect polarity connections to active speakers, although this feature may be irrelevant for passive speakers.
  • There is a request for clarification, suggesting that a visual reference might help to better understand the discussion about the speaker connection.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and functionality of the 4-pin connector, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Some assumptions about the use of the 4-pin connector and its relevance to different types of speakers are not fully explored, leaving room for further inquiry into the historical context and technical specifications.

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For as long as I can remember, the typical speaker connection on computer motherboards has 4 pins and the typical speaker has a 4 slot female connector with only two wires leading to the speaker. Is a there a technical or historical reason for the 4 pin connector?
 
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Stephen Tashi said:
For as long as I can remember, the typical speaker connection on computer motherboards has 4 pins and the typical speaker has a 4 slot female connector with only two wires leading to the speaker. Is a there a technical or historical reason for the 4 pin connector?

do they ?

All my computer (over many years) speaker/headphone connector is 3 contact ... ie... stereo ... Left, Right, Common

maybe a pic of what you are referring to may help clarify ? :smile:
 
51Xmj4bJE-L._SY355_.jpg
 

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Inner lines in original PC 4-pin speaker connector are the "key" pin and ground pin, preventing connector from been connected in reverse polarity to active (amplifier-containing) speakers. With the typical passive (symmetric) speakers it is a useless feature, therefore inner lines are not used in the picture you shown.
 
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