Voltage of sounds of MP3 files












6












$begingroup$


What is the maximum voltage for common music files?



When playing back on a smartphone, if the volume of the smartphone is set to maximum, how much voltage is sent to the earphones of the electric signal?






voltage sound







share|improve this question









New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$








  • 9




    $begingroup$
    if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
    $endgroup$
    – jsotola
    23 hours ago






  • 1




    $begingroup$
    Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
    $endgroup$
    – Solomon Slow
    23 hours ago






  • 7




    $begingroup$
    The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
    $endgroup$
    – J...
    21 hours ago






  • 1




    $begingroup$
    It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
    $endgroup$
    – Ken Shirriff
    21 hours ago
















6












$begingroup$


What is the maximum voltage for common music files?



When playing back on a smartphone, if the volume of the smartphone is set to maximum, how much voltage is sent to the earphones of the electric signal?






voltage sound







share|improve this question









New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$








  • 9




    $begingroup$
    if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
    $endgroup$
    – jsotola
    23 hours ago






  • 1




    $begingroup$
    Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
    $endgroup$
    – Solomon Slow
    23 hours ago






  • 7




    $begingroup$
    The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
    $endgroup$
    – J...
    21 hours ago






  • 1




    $begingroup$
    It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
    $endgroup$
    – Ken Shirriff
    21 hours ago














6












6








6





$begingroup$


What is the maximum voltage for common music files?



When playing back on a smartphone, if the volume of the smartphone is set to maximum, how much voltage is sent to the earphones of the electric signal?






voltage sound







share|improve this question









New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




What is the maximum voltage for common music files?



When playing back on a smartphone, if the volume of the smartphone is set to maximum, how much voltage is sent to the earphones of the electric signal?






voltage sound




voltage sound






share|improve this question









New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 5 hours ago









Peter Mortensen

1,60031422




1,60031422






New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 23 hours ago









たくまいわきたくまいわき

374




374




New contributor




たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






たくまいわき is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 9




    $begingroup$
    if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
    $endgroup$
    – jsotola
    23 hours ago






  • 1




    $begingroup$
    Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
    $endgroup$
    – Solomon Slow
    23 hours ago






  • 7




    $begingroup$
    The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
    $endgroup$
    – J...
    21 hours ago






  • 1




    $begingroup$
    It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
    $endgroup$
    – Ken Shirriff
    21 hours ago














  • 9




    $begingroup$
    if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
    $endgroup$
    – jsotola
    23 hours ago






  • 1




    $begingroup$
    Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
    $endgroup$
    – Solomon Slow
    23 hours ago






  • 7




    $begingroup$
    The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
    $endgroup$
    – J...
    21 hours ago






  • 1




    $begingroup$
    It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
    $endgroup$
    – Ken Shirriff
    21 hours ago








9




9




$begingroup$
if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
$endgroup$
– jsotola
23 hours ago




$begingroup$
if you really think about what you asked, then you will realise that you asked the kind of question that is un-answerable .... you did not define the parameters of the music file contents ........ a similar un-answerable question is how loud is music?
$endgroup$
– jsotola
23 hours ago




1




1




$begingroup$
Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
$endgroup$
– Solomon Slow
23 hours ago




$begingroup$
Perhaps this is a question about the electrical interface between an audio device and a headphone or earphone set rather than a question about sampled audio data.
$endgroup$
– Solomon Slow
23 hours ago




7




7




$begingroup$
The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
$endgroup$
– J...
21 hours ago




$begingroup$
The MP3 records sound intensity in a range between zero and maximum. The hardware playing the MP3 decides what "Maximum" means.
$endgroup$
– J...
21 hours ago




1




1




$begingroup$
It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
$endgroup$
– Ken Shirriff
21 hours ago




$begingroup$
It depends on the phone and the earphone impedance, but iPhone 6 produces a maximum of about 1V RMS according to this link: anandtech.com/show/8554/the-iphone-6-review/11
$endgroup$
– Ken Shirriff
21 hours ago










3 Answers
3






active

oldest

votes


















15












$begingroup$

Amplification



It does not depend on the music file, but at the amplifier sending the music to a speaker, or to a headphone/earplug connector.



Music file



A music file only contains 'values', and mostly in a compressed form. After uncompressing, you get values which has a certain amount on bits per value (typically 16 or more).



Conversion



A microcontroller can send these values to a speaker via an pre- and/or amplifier, which converts it into actual voltages. So it depends on the amount of amplification.



Protection



Also note that sending continuous 'max values' do not result in a loud sound, actually it would breaks the speaker (to prevent this, in the amplifier a so-called DC speaker protection is present). A wave is needed to let the speaker move outwards and inwards very fast, and this is done by sending changing values to the speaker.



Measure



If you want to measure, you can use an oscilloscope to measure the audio output while sending a sine wave with a maximum amplitude.






share|improve this answer











$endgroup$









  • 9




    $begingroup$
    Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
    $endgroup$
    – Solomon Slow
    23 hours ago






  • 2




    $begingroup$
    @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
    $endgroup$
    – Michel Keijzers
    23 hours ago






  • 3




    $begingroup$
    @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
    $endgroup$
    – UKMonkey
    13 hours ago










  • $begingroup$
    @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
    $endgroup$
    – Mołot
    4 hours ago










  • $begingroup$
    @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
    $endgroup$
    – UKMonkey
    4 hours ago



















5












$begingroup$

These days a lot of DAC chips for consumer equipment use voltage output of 2 Vrms.



The supply voltage is largely irrelevant, as a lot of DAC chips also use internal charge pumps to boost up supply voltage and to generate negative supply voltage for the audio output stage, so they can drive DC coupled loads directly.






share|improve this answer











$endgroup$













  • $begingroup$
    "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
    $endgroup$
    – Sjoerd
    2 hours ago



















3












$begingroup$

Normally it's limited by the cellphone battery voltage, which is about 3.7V. However there are other limits in play like the EU volume limit of 100dB - which is specified as SPL rather than a voltage.






share|improve this answer









$endgroup$













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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    15












    $begingroup$

    Amplification



    It does not depend on the music file, but at the amplifier sending the music to a speaker, or to a headphone/earplug connector.



    Music file



    A music file only contains 'values', and mostly in a compressed form. After uncompressing, you get values which has a certain amount on bits per value (typically 16 or more).



    Conversion



    A microcontroller can send these values to a speaker via an pre- and/or amplifier, which converts it into actual voltages. So it depends on the amount of amplification.



    Protection



    Also note that sending continuous 'max values' do not result in a loud sound, actually it would breaks the speaker (to prevent this, in the amplifier a so-called DC speaker protection is present). A wave is needed to let the speaker move outwards and inwards very fast, and this is done by sending changing values to the speaker.



    Measure



    If you want to measure, you can use an oscilloscope to measure the audio output while sending a sine wave with a maximum amplitude.






    share|improve this answer











    $endgroup$









    • 9




      $begingroup$
      Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
      $endgroup$
      – Solomon Slow
      23 hours ago






    • 2




      $begingroup$
      @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
      $endgroup$
      – Michel Keijzers
      23 hours ago






    • 3




      $begingroup$
      @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
      $endgroup$
      – UKMonkey
      13 hours ago










    • $begingroup$
      @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
      $endgroup$
      – Mołot
      4 hours ago










    • $begingroup$
      @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
      $endgroup$
      – UKMonkey
      4 hours ago
















    15












    $begingroup$

    Amplification



    It does not depend on the music file, but at the amplifier sending the music to a speaker, or to a headphone/earplug connector.



    Music file



    A music file only contains 'values', and mostly in a compressed form. After uncompressing, you get values which has a certain amount on bits per value (typically 16 or more).



    Conversion



    A microcontroller can send these values to a speaker via an pre- and/or amplifier, which converts it into actual voltages. So it depends on the amount of amplification.



    Protection



    Also note that sending continuous 'max values' do not result in a loud sound, actually it would breaks the speaker (to prevent this, in the amplifier a so-called DC speaker protection is present). A wave is needed to let the speaker move outwards and inwards very fast, and this is done by sending changing values to the speaker.



    Measure



    If you want to measure, you can use an oscilloscope to measure the audio output while sending a sine wave with a maximum amplitude.






    share|improve this answer











    $endgroup$









    • 9




      $begingroup$
      Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
      $endgroup$
      – Solomon Slow
      23 hours ago






    • 2




      $begingroup$
      @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
      $endgroup$
      – Michel Keijzers
      23 hours ago






    • 3




      $begingroup$
      @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
      $endgroup$
      – UKMonkey
      13 hours ago










    • $begingroup$
      @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
      $endgroup$
      – Mołot
      4 hours ago










    • $begingroup$
      @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
      $endgroup$
      – UKMonkey
      4 hours ago














    15












    15








    15





    $begingroup$

    Amplification



    It does not depend on the music file, but at the amplifier sending the music to a speaker, or to a headphone/earplug connector.



    Music file



    A music file only contains 'values', and mostly in a compressed form. After uncompressing, you get values which has a certain amount on bits per value (typically 16 or more).



    Conversion



    A microcontroller can send these values to a speaker via an pre- and/or amplifier, which converts it into actual voltages. So it depends on the amount of amplification.



    Protection



    Also note that sending continuous 'max values' do not result in a loud sound, actually it would breaks the speaker (to prevent this, in the amplifier a so-called DC speaker protection is present). A wave is needed to let the speaker move outwards and inwards very fast, and this is done by sending changing values to the speaker.



    Measure



    If you want to measure, you can use an oscilloscope to measure the audio output while sending a sine wave with a maximum amplitude.






    share|improve this answer











    $endgroup$



    Amplification



    It does not depend on the music file, but at the amplifier sending the music to a speaker, or to a headphone/earplug connector.



    Music file



    A music file only contains 'values', and mostly in a compressed form. After uncompressing, you get values which has a certain amount on bits per value (typically 16 or more).



    Conversion



    A microcontroller can send these values to a speaker via an pre- and/or amplifier, which converts it into actual voltages. So it depends on the amount of amplification.



    Protection



    Also note that sending continuous 'max values' do not result in a loud sound, actually it would breaks the speaker (to prevent this, in the amplifier a so-called DC speaker protection is present). A wave is needed to let the speaker move outwards and inwards very fast, and this is done by sending changing values to the speaker.



    Measure



    If you want to measure, you can use an oscilloscope to measure the audio output while sending a sine wave with a maximum amplitude.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 1 hour ago

























    answered 23 hours ago









    Michel KeijzersMichel Keijzers

    6,73092970




    6,73092970








    • 9




      $begingroup$
      Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
      $endgroup$
      – Solomon Slow
      23 hours ago






    • 2




      $begingroup$
      @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
      $endgroup$
      – Michel Keijzers
      23 hours ago






    • 3




      $begingroup$
      @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
      $endgroup$
      – UKMonkey
      13 hours ago










    • $begingroup$
      @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
      $endgroup$
      – Mołot
      4 hours ago










    • $begingroup$
      @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
      $endgroup$
      – UKMonkey
      4 hours ago














    • 9




      $begingroup$
      Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
      $endgroup$
      – Solomon Slow
      23 hours ago






    • 2




      $begingroup$
      @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
      $endgroup$
      – Michel Keijzers
      23 hours ago






    • 3




      $begingroup$
      @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
      $endgroup$
      – UKMonkey
      13 hours ago










    • $begingroup$
      @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
      $endgroup$
      – Mołot
      4 hours ago










    • $begingroup$
      @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
      $endgroup$
      – UKMonkey
      4 hours ago








    9




    9




    $begingroup$
    Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
    $endgroup$
    – Solomon Slow
    23 hours ago




    $begingroup$
    Re, "...actually it breaks the speaker." If I can create a sound file that blows your speakers when you play it, the fault is not in my file. Your music player should at least be able to survive any sound file that you try to play.
    $endgroup$
    – Solomon Slow
    23 hours ago




    2




    2




    $begingroup$
    @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
    $endgroup$
    – Michel Keijzers
    23 hours ago




    $begingroup$
    @SolomonSlow Good point, I updated my answer (and learnt something myself from it).
    $endgroup$
    – Michel Keijzers
    23 hours ago




    3




    3




    $begingroup$
    @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
    $endgroup$
    – UKMonkey
    13 hours ago




    $begingroup$
    @SolomonSlow Some speakers won't be very happy if you play a mono-tone at a resonant frequency; And it happens quite often with sub woofer speakers; I'm sure you've heard some where the cone has been damaged. I agree the ideal is that the speaker should survive any input; but realistically if you find the right resonant frequency the damping of the speaker might not be sufficient to protect it.
    $endgroup$
    – UKMonkey
    13 hours ago












    $begingroup$
    @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
    $endgroup$
    – Mołot
    4 hours ago




    $begingroup$
    @UKMonkey I'd reword it to "music system should survive any sound that can be reasonably expected to happen during normal use". And I agree that many sub woofers are badly (or rather - cheaply) designed and do not.
    $endgroup$
    – Mołot
    4 hours ago












    $begingroup$
    @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
    $endgroup$
    – UKMonkey
    4 hours ago




    $begingroup$
    @Mołot no - I would say that a speaker shouldn't be damaged by the amplifier for any output of the amp within the acceptable ranges supported by the speaker. This means that if the speaker needs to be rated for a lower voltage (be it by shipping with a different amp or something else) to ensure it doesn't self destruct at 20Hz; then that's what it needs to do.
    $endgroup$
    – UKMonkey
    4 hours ago













    5












    $begingroup$

    These days a lot of DAC chips for consumer equipment use voltage output of 2 Vrms.



    The supply voltage is largely irrelevant, as a lot of DAC chips also use internal charge pumps to boost up supply voltage and to generate negative supply voltage for the audio output stage, so they can drive DC coupled loads directly.






    share|improve this answer











    $endgroup$













    • $begingroup$
      "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
      $endgroup$
      – Sjoerd
      2 hours ago
















    5












    $begingroup$

    These days a lot of DAC chips for consumer equipment use voltage output of 2 Vrms.



    The supply voltage is largely irrelevant, as a lot of DAC chips also use internal charge pumps to boost up supply voltage and to generate negative supply voltage for the audio output stage, so they can drive DC coupled loads directly.






    share|improve this answer











    $endgroup$













    • $begingroup$
      "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
      $endgroup$
      – Sjoerd
      2 hours ago














    5












    5








    5





    $begingroup$

    These days a lot of DAC chips for consumer equipment use voltage output of 2 Vrms.



    The supply voltage is largely irrelevant, as a lot of DAC chips also use internal charge pumps to boost up supply voltage and to generate negative supply voltage for the audio output stage, so they can drive DC coupled loads directly.






    share|improve this answer











    $endgroup$



    These days a lot of DAC chips for consumer equipment use voltage output of 2 Vrms.



    The supply voltage is largely irrelevant, as a lot of DAC chips also use internal charge pumps to boost up supply voltage and to generate negative supply voltage for the audio output stage, so they can drive DC coupled loads directly.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 4 hours ago

























    answered 18 hours ago









    JustmeJustme

    1,9821413




    1,9821413












    • $begingroup$
      "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
      $endgroup$
      – Sjoerd
      2 hours ago


















    • $begingroup$
      "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
      $endgroup$
      – Sjoerd
      2 hours ago
















    $begingroup$
    "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
    $endgroup$
    – Sjoerd
    2 hours ago




    $begingroup$
    "2 Vrms" here means 2 volts on average, where RMS (root mean square) is the method of calculating the average.
    $endgroup$
    – Sjoerd
    2 hours ago











    3












    $begingroup$

    Normally it's limited by the cellphone battery voltage, which is about 3.7V. However there are other limits in play like the EU volume limit of 100dB - which is specified as SPL rather than a voltage.






    share|improve this answer









    $endgroup$


















      3












      $begingroup$

      Normally it's limited by the cellphone battery voltage, which is about 3.7V. However there are other limits in play like the EU volume limit of 100dB - which is specified as SPL rather than a voltage.






      share|improve this answer









      $endgroup$
















        3












        3








        3





        $begingroup$

        Normally it's limited by the cellphone battery voltage, which is about 3.7V. However there are other limits in play like the EU volume limit of 100dB - which is specified as SPL rather than a voltage.






        share|improve this answer









        $endgroup$



        Normally it's limited by the cellphone battery voltage, which is about 3.7V. However there are other limits in play like the EU volume limit of 100dB - which is specified as SPL rather than a voltage.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 22 hours ago









        pjc50pjc50

        34.4k34288




        34.4k34288






















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