Dumb Question - two channels into one

Discussion in 'AV Receivers' started by Stephen Dodds, May 18, 2003.

  1. Stephen Dodds

    Stephen Dodds Second Unit

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    I'm sure there is a reason one shouldn't run two inputs into one amplifier channel. Can someone re-enlighten me to what that reason is?

    Thanks

    Steve
     
  2. Roger Dressler

    Roger Dressler Stunt Coordinator

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    Assuming you mean tying the two signal sources together a hardwire connection like a Y adapter, yes, it is a bad idea. Signal sources like preamps, DVD players, cassette decks, STBs, all have low source resistance, usually an opamp with a 100 ohm breakout resistor. When driving the 10k-50k typical input of an amplifier or other preamp input, it's fine. But when two of them try to drive each other, it's like loading the output with 100 ohm load to ground. The result is usually distortion and loss of signal level.
     

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