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Audio Systems/4 ohms voltage gain

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Expert: - 12/21/2008


Question
Hello I was looking at the QSC GX3 amplifier and the voltage gain at 8 ohms is (32.2db)in decibels and (40.7x)in voltage gain  so what is this information at 4 ohms?

Answer
The same.  Voltage gain is the ratio of voltage out divided by voltage in.  The load impedance does not change the voltage gain, only the power gain!

Further comments:
For example, if the output voltage is 8vac and the load is 8 ohms the power output into the load is 8 squared over 8 ohms or 8 watts. If the load is 4 ohms the power out becomes 8 squared over 4 ohms or 16 watts.  If the load is removed the voltage remains the same and the output power is zero watts....  and so on.   Damping factor is the specification that tells how much or little the voltage changes with a change in load impedance.

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Cleggsan

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Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

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Have been associated with audio design, standards, testing and component systems for over 40 years.

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Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

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Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

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BSEE/MSCS/MBA

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Past Employee/advisor to several well known audio products manufacturers

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