So the goldpoint pre-attenuation circuit definitely looks like the way to go if you want to pad your input signal by more than a few decibels (to say nothing of preserving input impedance). It has been about a decade since I took any class relating to E&M, so I enlisted my physicist father to help me with some napkin math while we put back a couple of Newcastles on the 4th.
To recap from page 1, I'm using a 100k TKD pot in my crack, and was planning on simply adding a pair of 75k ohm resisters in series with the inputs to pad the volume. However, after calculating it out, it turns out that 75k ohm resisters in series with a 100k pot will actually only reduce the input signal by about 5 db. By contrast, adding in the 75k ohm resisters and also a second set of resisters (R2 as shown in http://www.goldpt.com/mods.html), of approximately ~33k ohms, bridging the input and ground terminals of the pot, will reduce the input signal by nearly 12 db, while also preserving the impedance.
This should be about perfect in my setup since I am often lowering the volume in Foobar by ~10 db if I have my pot in the vicinity of 9:00.
To recap from page 1, I'm using a 100k TKD pot in my crack, and was planning on simply adding a pair of 75k ohm resisters in series with the inputs to pad the volume. However, after calculating it out, it turns out that 75k ohm resisters in series with a 100k pot will actually only reduce the input signal by about 5 db. By contrast, adding in the 75k ohm resisters and also a second set of resisters (R2 as shown in http://www.goldpt.com/mods.html), of approximately ~33k ohms, bridging the input and ground terminals of the pot, will reduce the input signal by nearly 12 db, while also preserving the impedance.
This should be about perfect in my setup since I am often lowering the volume in Foobar by ~10 db if I have my pot in the vicinity of 9:00.
