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    lxu8888's Avatar
    lxu8888 Posts: 10, Reputation: 1
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    #1

    Mar 31, 2009, 07:07 PM
    Speaker active and passive
    I try to purchase a set of speaker and found the description of active subwoofer and passive satellites. What do the active and passive mean? Thanks.
    DanielF's Avatar
    DanielF Posts: 158, Reputation: 14
    Junior Member
    		  
    #2

    Apr 1, 2009, 02:40 AM
    An 'active' speaker has an amplifier built in, so all it needs to make a sound is a 'line level' (low power) signal from a surround receiver. 'Passive' speakers have no in-built amplifier, so they require a power amplifier to drive them (with a higher voltage and current than a line output).

    If you look on the back of a surround receiver, you will see that (usually) there are 'heavy-duty' terminals for the forward and surround speakers, since these are driven with considerable current from the amplifier, but the sub-woofer output is usually an RCA ('phono') connector, because it provides only a small voltage, with negligible current to a powered (active) sub-woofer.

    Daniel
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