POP sound when turning off TT


Equip:
TT: Rega Planar 6
Phono Preamp: Lehmann Audio Black Box SE
Integrated Amp: Cambridge Audio CAX81
Speakers: Monitor Audio Silver 300

I just swapped out the phono preamp with the Schitt Mani that I had.  I immediately noticed the humming/buzzing sound was gone when absent any source.  Probably a grounding issue.

However, now when I go to power off the Rega (it comes with a separate PSU), I get a loud POP out of the speakers.  Keep in mind the phono preamp is still on.

When I had the Schiit, albeit a much less quality preamp, I never got the pop. 

What can/should I do?  Ground the phono preamp to the CAX81?

bound4h

I don't have any kind of conditioning gear currently.  Would this work?

 

  

 

@bound4h

Would this work?

I don’t know, but it probably doesn’t have the filtering that the Isobar Ultra has. The Line Conditioner is probably overkill for what you’re experiencing, and since it has a rather large transformer in it, you may be introducing more problems (like EMI) into the scenario, compared to what you’re experiencing now. If the Isobar Ultra doesn’t fix your problem, it’s still a fantastic surge protector for your audio gear.

It’s also possible that there is some arcing taking place on the Rega power supply switch, and the arcing of this switch is reaching into audio frequency territory, which is broadcasting this signal as RFI. It’s possible the Schitt Mani was able to previously reject this noise, but the Lehmann Audio Black Box SE can’t.

My best suggestion is to try the very affordable Tripp Lite Isobar Ultra. It has eliminated so many pops and clicks (from home inductive appliances) that I was experiencing before, that I was never able to eliminate.

When I have the mani phono preamp? It does exactly what you describe, that time it’s connected to my integrated viva amp.On my third system connected to Art audio preamp, it so quiet. I can’t explain why?.