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Power Amp Input Impedances?

Discussion in 'Amps and Cabs [BG]' started by twangchief, Aug 2, 2007.


  1. twangchief

    twangchief Supporting Member

    Oct 30, 2003
    Altoona, PA
    Ok....I'm really fuzzy on the technical stuff.

    If I want to drive a power amp's input (20k ohm or 10k ohm on a QSC PLX 1604), the output impedance of the driving device should be much lower like the 600 ohms or less like the QSC manual suggests.....correct? So, would 50 ohms be too low?

    Thanks.
     
  2. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio! Commercial User

    Jul 3, 2001
    Costa Mesa, Calif.
    Technical Communications Developer, QSC Audio
    No, 50 ohms (less than 600 ohms) would be even better.
     
  3. twangchief

    twangchief Supporting Member

    Oct 30, 2003
    Altoona, PA
    Alrighty then.....

    Thanks Bob! I guess I'm ready to roll! :)
     
  4. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    The lower the better. Most active devices have very low output impedance unless the last part in the signal chain is a passive volume control.
     

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