I found a program that will allow me to calculate the steps for a series attenuator. but it requires i enter a number for the total attenuation.
How much attenuation is required for a typical stepped series volume control? This will be placed between a CD player and a Power amp.
How much attenuation is required for a typical stepped series volume control? This will be placed between a CD player and a Power amp.
Hi,
aim for between -60db and -80db.
But if you never listen to quiet music a smaller range may do, -40db to -60db.
You can also set the first step at -20db (or even higher) if you have a sensitive system that tends to have a high attenuation during all listening sessions.
aim for between -60db and -80db.
But if you never listen to quiet music a smaller range may do, -40db to -60db.
You can also set the first step at -20db (or even higher) if you have a sensitive system that tends to have a high attenuation during all listening sessions.
thanks i will give those numbers a shot.
How would i calculate the total resistance of a standard pot for comparison???
How would i calculate the total resistance of a standard pot for comparison???
Hi,
it will usually be between 10k and 100k.
You would not calculate it.
Just measure it if the labeling is illegible.
it will usually be between 10k and 100k.
You would not calculate it.
Just measure it if the labeling is illegible.
Oh i meesed up, i MEANT to say, how would i measure the total attenuation of a pot for comparison.
Zc
Zc
Hi,
most pots will go down to completely off (-infinitydb).
Very few audio taper pots are accurate by the time they get to -60db, the balance starts to wander to and fro as you adjust the attenuator. At -80db they are usually hopeless.
It is to improve this balance problem that some use a dual linear pot.
Then we are in a different ballpark when we go to stepped attenuator. You can easily achieve +-0.1db and even ten times better with selection, both in balance and absolute terms.
most pots will go down to completely off (-infinitydb).
Very few audio taper pots are accurate by the time they get to -60db, the balance starts to wander to and fro as you adjust the attenuator. At -80db they are usually hopeless.
It is to improve this balance problem that some use a dual linear pot.
Then we are in a different ballpark when we go to stepped attenuator. You can easily achieve +-0.1db and even ten times better with selection, both in balance and absolute terms.
You need to allow for input level variation, which can be as much as 20dB between an old cassette deck and a CD player, so 40dB is too small
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