Loud poping sound when turning off Paramount 300B

[Anton]

Hello,
I have Eros Phono feeding into Foreplay III extended upgrade and Paramount 300B monoblocs (without soft start) - driving Cain&Cain Abby speakers.
When I turn on my stereo I start with Eros first, then turn on Foreplay (with volume knobs down to zero), then I turn on monoblocks. After that, I adjust volume as needed.
When I turn my stereo off, I start by turning the volume down to zero, after that, I turn off, monoblocks and last I shut down the phono stage.

My problem is this: when I turn on Paramounts, after 3-4 seconds my speakers make this pop sound, not very loud though so it doesn't bother me much. 
But when I turn off monoblocks, my speakers make a pretty loud and ugly sounding popping sound (even though the volume knob on pre-amp is down to zero). I am wondering if that can blow my speakers. And the interesting thing is if I disconnect Foreplay from Paramounts before shutting Paramounts down, there is no pop. Did anyone else had a similar experience and what should I do?

When I am using SEX 2.1 with the speakers I don't have such a problem.

Thanks in advance for feedback

[Paul Birkeland]

if I disconnect Foreplay from Paramounts before shutting Paramounts down, there is no pop.

That's really, really odd.  I would definitely recommend measuring the voltages in the Paramounts and Foreplay to be sure they are working properly.  How is the grounding where you live?  Are all the outlets earthed?

[Anton]

Paul,
Thank you very much.
I checked the ground wire running from my turntable to the grounding post on Eros. It turned out that it got disconnected on turntable side and I didn't notice that. I re-connected the grounding wire and it made it much better. I still can hear audible pop when I turn off the power amp, but it is not nearly as violent as before.
As for the grounding of outlets, I am not sure but I never had serious issues with that before. Also, I am using PS Audio Power Plant to plug all my components into.

[Paul Birkeland]

Hmm, you could definitely try not using the PS Audio Power Plant to see if that makes a difference.  If the turntable wire made a big change, I would suspect that there might be earthing issues related to your AC mains.