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TAS6424-Q1: TAS6424-Q1 what situations will cause the output volume to change?

Lawrence He
Expert 2800 points
Part Number: TAS6424-Q1

Hi, Support Team

our client have three question as below:

Q1: we are currently doing an experiment. I connected a cement resistor in series between the Amplifier and the Speaker, and the volume became smaller.
So when the impedance of the circuit becomes larger, the output volume will become smaller. this result is correct?

Q2: When the Amplifier or Speaker operating life test or damaged, could possible impedance increase and the output volume become smaller?

Q3: what situations will cause the output volume to change? (if Amp settings do not change register)  

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Mastermind 36625 points

    Lawrence,

    You do not provide enough information in your tests.

    1. Where are you measuring the output volume?  At the speaker or at the amplifier outputs?  What volume level are you seeing?  At what frequency?  What is your output filter values? 
    2. When there is potential damage, there are too many variables to determine what would happen.  In the case of speaker aging, the speaker itself would determine the volume.  
    3. How much of a change in volume?

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Prodigy 110 points

    Hi Gregg,

    For the first question, I used my cellphone and installed a decibel meter app to measure the sound volume. The speaker I used is 8 ohms and 3 watts, and the measured dB value is 82dB. Afterward, I connected three 4-ohm cement resistors in series, and the volume decreased to 81dB. I measured the current as well and noticed a decrease, but I didn't record the values. For all tests, I played a 1kHz tone.

    Thanks,

    Regards,

    Leo.

  • 0 in reply to Leo Syu
    TI__Mastermind 36625 points

    Leo,

    By placing 12 ohms in series with an 8 ohm speaker, you should see more than a 6dB drop in output. You measured only 1dB reduction.  Is your dB meter located the same distance away from your speaker?  You are also use a 1kHz tone for measurement.  What is the speaker impedance at 1kHz?  This will also affect the output level.  All of these factors and variables, need to be understood before you talk about it being an amplifier problem.

    I don't understand why you would expect to have the same output when you put 12 ohms in series with an 8 ohm speaker.  What are you trying to determine in your testing?  I can help you with a test that will give you the data you are needing.

    Regards,
    Gregg Scott