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  • adjusting a pots output

    i installed a 50k alps pot the my new amp and turned all the way down, its just right. all the way up and it will blow me out of the room.
    question; can i put an inline resistor, maybe 10 or 20 ohms to atenuate it a bit? would a cast 10 watt be good for this?
    " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

    Quote Originally Posted by hongrn. Oct 2014
    Do you realize that being an American is like winning the biggest jackpot ever??

    http://www.midwestaudioclub.com/spot...owell-simpson/
    http://s413.photobucket.com/albums/pp216/arlis/

  • #2
    Re: adjusting a pots output

    values of 10 or 20 in series will allow you to dial it in until you find a value that when added won't blow you out of the room. As to the wattage whatever the alps pot is rated for should be suitable for the added resistor since they'll be in series.

    Comment


    • #3
      Re: adjusting a pots output

      thanks guess i should have got the 100k
      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

      Quote Originally Posted by hongrn. Oct 2014
      Do you realize that being an American is like winning the biggest jackpot ever??

      http://www.midwestaudioclub.com/spot...owell-simpson/
      http://s413.photobucket.com/albums/pp216/arlis/

      Comment


      • #4
        Re: adjusting a pots output

        Hindsight right? The thing is... I don't think that's the problem. Turned all the way up (the highest volume level) both pots would read 0 ohms, the difference would be how much attenuation all the way down would be, and you've stated the 50k is satisfactory, so it seems adding some resistance after the pot is the right method.

        Comment


        • #5
          Re: adjusting a pots output

          just right for listening but i cant turn it down to here what the wife just said. that could get me in trouble.
          " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

          Quote Originally Posted by hongrn. Oct 2014
          Do you realize that being an American is like winning the biggest jackpot ever??

          http://www.midwestaudioclub.com/spot...owell-simpson/
          http://s413.photobucket.com/albums/pp216/arlis/

          Comment


          • #6
            Re: adjusting a pots output

            The description you've given is slightly unclear. But, you may want to try a 10K or 25K or 50K (etc.) resistor in series BEFORE the pot and see if that helps you get what you're looking for.

            Originally posted by arlis_1957@yahoo.com View Post
            i installed a 50k alps pot the my new amp and turned all the way down, its just right. all the way up and it will blow me out of the room.
            question; can i put an inline resistor, maybe 10 or 20 ohms to atenuate it a bit? would a cast 10 watt be good for this?

            Comment


            • #7
              Re: adjusting a pots output

              yes i think your right. i suppose the input voltage is so high that a 50k wont do so i should turn it into a 100k by adding a 50k before it. wow, i think im beginning to make sence!
              " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

              Quote Originally Posted by hongrn. Oct 2014
              Do you realize that being an American is like winning the biggest jackpot ever??

              http://www.midwestaudioclub.com/spot...owell-simpson/
              http://s413.photobucket.com/albums/pp216/arlis/

              Comment


              • #8
                Re: adjusting a pots output

                Originally posted by arlis_1957@yahoo.com View Post
                thanks guess i should have got the 100k
                What kind of taper did you use?
                "Not a Speaker Designer - Not even on the Internet"
                “Pride is your greatest enemy, humility is your greatest friend.”
                "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

                Comment


                • #9
                  Re: adjusting a pots output

                  audio/log taper.
                  this one. http://www.partsconnexion.com/product7387.html
                  " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                  Quote Originally Posted by hongrn. Oct 2014
                  Do you realize that being an American is like winning the biggest jackpot ever??

                  http://www.midwestaudioclub.com/spot...owell-simpson/
                  http://s413.photobucket.com/albums/pp216/arlis/

                  Comment


                  • #10
                    Re: adjusting a pots output

                    Originally posted by arlis_1957@yahoo.com View Post
                    i installed a 50k alps pot the my new amp and turned all the way down, its just right. all the way up and it will blow me out of the room.
                    Turned all the way down you shouldn't hear anything if this is an input level control. One side of the pot should be at ground and the other side should have the input signal and with the control turned down the output (the pots wiper) should be at ground too. Adding series resistance to the input signal side will form a voltage divider and attenuate the output and yes the size of the resistor will be in the K-ohms to do anything meaningful.

                    Another thing you need to watch with attenuators is unless they have a resistive load you could be creating a filter in which case you may need to consider and active buffer.

                    Ron
                    C-Note Iron Driver Build
                    The Lydias
                    The Cherry π's
                    The Champs - Iron Driver 2015 Entry
                    My Projects Page

                    The good thing about science is that it's true whether or not you believe in it. - Neil deGrasse Tyson
                    http://www.youtube.com/watch?v=cjuGCJJUGsg

                    Comment


                    • #11
                      Re: adjusting a pots output

                      i did not tie to the ground. just input and wiper. could that be the problem?
                      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                      Quote Originally Posted by hongrn. Oct 2014
                      Do you realize that being an American is like winning the biggest jackpot ever??

                      http://www.midwestaudioclub.com/spot...owell-simpson/
                      http://s413.photobucket.com/albums/pp216/arlis/

                      Comment


                      • #12
                        Re: adjusting a pots output

                        Originally posted by arlis_1957@yahoo.com View Post
                        i did not tie to the ground. just input and wiper. could that be the problem?
                        Yes. The way you wired it you're just adding series resistance to the input of the amp. The pot should be a voltage divider with the signal attached to one end and ground connected to the other and the wiper as the output.

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                        Ron
                        C-Note Iron Driver Build
                        The Lydias
                        The Cherry π's
                        The Champs - Iron Driver 2015 Entry
                        My Projects Page

                        The good thing about science is that it's true whether or not you believe in it. - Neil deGrasse Tyson
                        http://www.youtube.com/watch?v=cjuGCJJUGsg

                        Comment


                        • #13
                          Re: adjusting a pots output

                          PS The way you wired it with the volume turned all the way one way you would be running the signal in with zero attenuation which would be as loud as it can go. With the pot all the way the other way you put 50K in series with the input which made it quieter but didn't short the input to ground like you want to do.

                          Ron
                          C-Note Iron Driver Build
                          The Lydias
                          The Cherry π's
                          The Champs - Iron Driver 2015 Entry
                          My Projects Page

                          The good thing about science is that it's true whether or not you believe in it. - Neil deGrasse Tyson
                          http://www.youtube.com/watch?v=cjuGCJJUGsg

                          Comment


                          • #14
                            Re: adjusting a pots output

                            got it. thanks ron.
                            " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                            Quote Originally Posted by hongrn. Oct 2014
                            Do you realize that being an American is like winning the biggest jackpot ever??

                            http://www.midwestaudioclub.com/spot...owell-simpson/
                            http://s413.photobucket.com/albums/pp216/arlis/

                            Comment


                            • #15
                              Re: adjusting a pots output

                              i tied everything and it made no difference. just for s &g's i added 45 ohms before the pot and it made no difference. now i wonder, is the center of a rca pos or neg. i have white on the center black on the outside. whites only through the source switch and vol pot. extra resistors on the white.
                              " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                              Quote Originally Posted by hongrn. Oct 2014
                              Do you realize that being an American is like winning the biggest jackpot ever??

                              http://www.midwestaudioclub.com/spot...owell-simpson/
                              http://s413.photobucket.com/albums/pp216/arlis/

                              Comment

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