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Empirical audio off ramp turbo I2S noise

Recently I install in my system a passive preamp that Im really happy with. The problem that I have is that if I use my off ramp turbo to convert usb to I2S that goes to my PT P3A, the preamp is picking up some noise from the off ramp, as soon as I unplug the I2S cable from the P3A noise disapears. If I use m2tech hiface usb to digital and the the P3A there is no noise at all.
Would like to know if other people found same issues or if someone have an explanation for that.
jorsan
roscoeiii's avatar
roscoeiii
1,155 posts
 
Have you contacted Empirical Audio? Seems like they would be the most qualified to answer that question...
audioengr
3,282 posts
 
The stock P-3A is not properly terminated on the I2S input. This may be the reason. For most customers, I modded the P-3A to fix this, as well as a lot of other improvements. Did I mod your P-3A?

What kind of I2S cable are you using?

Steve N.
Empirical Audio
jorsan OP
178 posts
 
Yes Steve is the turbo mod. The problem is only there if I use a passive amp, not a regular one, in that case is dead silence. The I2S cable is the one that you provides me with the package.
audioengr
3,282 posts
 
You may have a ground-loop problem when you use the passive linestage. Make sure that the AC power for the P-3A, the Off-Ramp and the amp is all from the same AC circuit.

Steve N.
Empirical Audio
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