New Phono Power Supply Issue

[Mean & Green]

I have just purchased this phono power supply. It is for powering both turntable and phono stage simultaneously.

Power Box S3 Phono – Pro-Ject Audio Systems

Double power for turntable and phono preamp! Power Box S3 Phono is a very efficient and flexible power filter for your turntable and phono preamp. By placing th

www.project-audio.com

The only reason I’ve bought it is to free up a mains outlet and feed my TT and pre amp from one mains outlet via this power box. My devices are also Pro-Ject products electrically compatible with the power supply.

Installing the power supply creates an issue where as soon as the turntable is switched on motor noise is heard through the speakers. This is without a record playing just the platter spinning.

Reverting back to the standard separate wall wart supplies for the TT and phono pre amp fixes the problem. The problem only occurs with the new power supply in the chain. I’m not 100% convinced it’s a ground loop because the sound heard through the speakers changes with motor speed and stops as soon as the platter stops.

My whole system consisting of integrated amp, digital sources and phono setup is all run off the same mains strip plugged into a wall outlet with no issues until trying out this phono power supply. Anyone have any ideas as to what may be going on?

Naturally I’ll be returning the product, but I’d just like some opinions as to what is happening here.

 

[pdevemy]

I encountered the same issue. I had the Pro-Ject X2 turntable and the Pro-Ject Phono Box Ultra 500 connected to the power box, and when I powered on the turntable, I could hear motor noise through the speakers. After switching back to the original power supply, the noise was reduced. The best results I’ve found come from having the turntable connected to the power box and the Phono Box using the original power supply. I’m considering replacing the Phono Box’s power supply with a linear one.

I think I've reached the capacity limit of the power box with both devices connected.

 

[Linn Axis]

I encountered the same issue. I had the Pro-Ject X2 turntable and the Pro-Ject Phono Box Ultra 500 connected to the power box, and when I powered on the turntable, I could hear motor noise through the speakers. After switching back to the original power supply, the noise was reduced. The best results I’ve found come from having the turntable connected to the power box and the Phono Box using the original power supply. I’m considering replacing the Phono Box’s power supply with a linear one.

I think I've reached the capacity limit of the power box with both devices connected.

I got the s3 and the ultra 500 hook together very happy. Run the s3 with the ultra 500. Also leave the power on the ultra so it hit the sweet spot.