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First step to problem solution is problem identification ... I think your missing two thirds of the issues that need to be addressed
In addition to injecting noise back into the power line ..
RF or airborne noise is ballooned into the surrounding area where it can re-couple to your equipment regardless of what type of filter you have on the power cord .. this airborne noise is created by the normal operation of your digital components and after your power cord conditioner
A third type of interference is high frequency noise that is created by your digital componentÂs normal operation and couples to the analog signal through the power supply and is output to your preamp
Some possible solutions ...
For your power cord/line you need a good quality Bi-directional filter that will filter the current coming in from the wall and also filter the current on the return cycle/leg so it is not injected back into the circuit ... this is alternating current that travels in both direction through one cycle through your power supply
IÂve used the MIT Iso Z and found it very effective .. the improvement it brought was immediate and far from subtle ... but it couldnÂt deal with the other two issues
I currently use two Foundation Research LC1Âs , which are bi-direction filters that are not transformer based like the MIT Iso Z ... the LC1Âs are a combination power cord and filter so itÂs was easier to use them instead of using up rack space
The LC1Âs seem just as effective and are more convenient in my set up ... IÂm sure there are other digital solution .. you have to do some shopping on the net
I read one of your other posts where Steve was speaking of the importance of filtering the ground through an isolation transformer to help ... if you take a look under the hood of your CD player .. Dac .. Flat screen and/or cable box/DVR box ... youÂll notice that there is no wire connected to the safety ground lug on the power IEC inlet ... they use double insulated power supplies with no ground wire ... they contain the fault with in the power supply ... if there is no ground wire going from the IEC to the componentÂs power supply ... do we still need to filter the ground wire .. ?????
Next is airborne noise .. this noise is created from the chips switching on and off at high frequencies .. you can cover the chips with RF blocking tape to help reduce their emission (IÂve done this ) .. or a more effective method I now employ is installing an Audio Magic Next Gen Plus module inside the player/dac ... the Gen Plus generates a signal that is the same frequency and amplitude as the offending noise but is 180 degrees out of phase with the noise so it cancels it by being equal and out of phase ... itÂs like a sponge soaking up the RF before it can balloon any further
The last place to look for interference is on the analog ICÂs .. high frequency noise will couple through the componentÂs power supply to the analog signal and be carried forward to the next component on the ICs were it will be amplified by the next stage
In the past I've used a product from the Great Northern Sound Company (GNSC) called a PASI (Passive Audio Sound Isolator ) .. basically a circuit built around two Jenson Isolation transformers which captured the high frequency noise riding on the analog signal
In my system I found that addressing the power in both direction and treating the airborne RF greatly reduced the noise the Cd player (Ayre D1ex) developed and the PASI had little to no effect and was removed and sold
I think you can now see the problem with noise created by are digital components is of a broader scope than you might have initially thought
ÂExperience is what you receive when you didnÂt get what you Expected .. ;-)
.
First step to problem solution is problem identification ... I think your missing two thirds of the issues that need to be addressed
In addition to injecting noise back into the power line ..
RF or airborne noise is ballooned into the surrounding area where it can re-couple to your equipment regardless of what type of filter you have on the power cord .. this airborne noise is created by the normal operation of your digital components and after your power cord conditioner
A third type of interference is high frequency noise that is created by your digital componentÂs normal operation and couples to the analog signal through the power supply and is output to your preamp
Some possible solutions ...
For your power cord/line you need a good quality Bi-directional filter that will filter the current coming in from the wall and also filter the current on the return cycle/leg so it is not injected back into the circuit ... this is alternating current that travels in both direction through one cycle through your power supply
IÂve used the MIT Iso Z and found it very effective .. the improvement it brought was immediate and far from subtle ... but it couldnÂt deal with the other two issues
I currently use two Foundation Research LC1Âs , which are bi-direction filters that are not transformer based like the MIT Iso Z ... the LC1Âs are a combination power cord and filter so itÂs was easier to use them instead of using up rack space
The LC1Âs seem just as effective and are more convenient in my set up ... IÂm sure there are other digital solution .. you have to do some shopping on the net
I read one of your other posts where Steve was speaking of the importance of filtering the ground through an isolation transformer to help ... if you take a look under the hood of your CD player .. Dac .. Flat screen and/or cable box/DVR box ... youÂll notice that there is no wire connected to the safety ground lug on the power IEC inlet ... they use double insulated power supplies with no ground wire ... they contain the fault with in the power supply ... if there is no ground wire going from the IEC to the componentÂs power supply ... do we still need to filter the ground wire .. ?????
Next is airborne noise .. this noise is created from the chips switching on and off at high frequencies .. you can cover the chips with RF blocking tape to help reduce their emission (IÂve done this ) .. or a more effective method I now employ is installing an Audio Magic Next Gen Plus module inside the player/dac ... the Gen Plus generates a signal that is the same frequency and amplitude as the offending noise but is 180 degrees out of phase with the noise so it cancels it by being equal and out of phase ... itÂs like a sponge soaking up the RF before it can balloon any further
The last place to look for interference is on the analog ICÂs .. high frequency noise will couple through the componentÂs power supply to the analog signal and be carried forward to the next component on the ICs were it will be amplified by the next stage
In the past I've used a product from the Great Northern Sound Company (GNSC) called a PASI (Passive Audio Sound Isolator ) .. basically a circuit built around two Jenson Isolation transformers which captured the high frequency noise riding on the analog signal
In my system I found that addressing the power in both direction and treating the airborne RF greatly reduced the noise the Cd player (Ayre D1ex) developed and the PASI had little to no effect and was removed and sold
I think you can now see the problem with noise created by are digital components is of a broader scope than you might have initially thought
ÂExperience is what you receive when you didnÂt get what you Expected .. ;-)
.