P20 & P15 Regenerator Performance Tweaks and Digital Stream Enhancements, plus BHK Preamp

OK, I’ll try the sheet to see what this sheet is all about.
From your reviews, I’m surprised that PSA missed this in their original design. Perhaps it’ll be incorporated in the next upgrade.
Can one of you, @aangen or @Vmax share a photo of what it looks like, properly applied?


See post 88 for Temp install.

There are recent photos of temp installs. The basic P20 sounds great until you hear it sounding better and what it really can do for soundstage, spatial cues, vocals and instruments low noise clean power to the rest of your system. @sheridd2 is planning the under lid install today.

With your premium power cord i am sure you will enjoy it.

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According to PSA, the P20 has small EMI strips located around the top metal cover.

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…see recent “Removing Top Plate” post.

Ok … I got the P20 top off and noticed the following.

Around the inside front of the lid edge were 3 little metal sections, the EMI strips?
The middle one could impact on the absorber material.
I decided not to do Vmax’s suggestion of folding a piece of the absorber over the front edge of the lid.
I thought this might interfere with the middle ‘strip’ and cause issues when trying to close the lid again.
So I placed the absorber up to the edge of the lid, maybe left a tiny gap, to ensure lid closure.

One other issue is that the lid has 4 small black screws with the two at the front interfering with the edges of the absorber so I cut the absorber material around these screws so that the material would stick flat to the underside of the lid.

Got the lid closed and the system re-assembled.

I had time constraints so I was unable to take photos during the process.

Seeing as I had my home cinema processor out I opened it up and added another strip the same size as the P20 strip under it’s top.

One other observation I discovered today.
I thought the narrow edge of the absorber was less than 8 inches so I’ve been using the wide width over my P20 during my testing on previous evenings.
I measured it today and found the narrow edge is in fact just greater than 8 inches.
So the piece of material allows for 3 pieces the recommended size of Vmax - 8 * 3.75 inches.

Testing later tonight.

Within the next week I’ll put some into my Panasonic 9000 blu ray player.


Is there an advantage to putting the RF absorber underneath the lid other than aesthetics? If I read Vmax correctly, it seems it could sit at the front edge of the top centered on the unit as others have shown.

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It might absorb lower frequencies that can’t escape through the faraday cage and further boost performance. The shorter the wave lengths the greater the ability to get through small gaps. I think on top it is addressing magnetic field primarily versus RF internal of longer wave lengths.

Your absorber testing was with the sheet on top of the unit, yes?

Yes I have been waiting for power cord and fuses to settle. Before internal install. I’d be happy if it stayed the same or improved further.

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I am not sure you will have same success if you kept length at 3.75 and just put up to front of the-lid. If you decided not to over lap EMI strip then trimming to 3.5 inches might be better. Part of my measurements dealt with influence of the electro magnetic field through the toroid transformer and its induced flow. The faraday Lenz Law. I am surmising were wires go into and out of the transformer is associated with this induced field. If you look at pictures of how it is wired inside P20. Connections come from front of the unit. In my placement tests and sonic good sound coverage of front half of transformer sounded better than from back half, right half or left half or entirely covering the transformer. So covering front half of circle helps induce current flow. Therefore sounds better. The other directions do nothing or degrade sound.

My trials showed a 1/4” further aft influenced the sound quite noticeable being less vibrant.

Here is excerpt from the physics lesson link previous.

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Synergistic Research let’s you evaluate the Fuses also! :confounded:

Are you trying to convince Al that fuses can make a big difference? Well, good luck!! :joy:

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I blew a fuse on my Gryphon Antileon Evo amplifier. When I ordered a replacement brand that was recommended in the manual I ordered 10 each of the three different fuses hidden inside. The bill for 30 fuses came to $9.77 and they added $9.99 for shipping. So almost $20 for thirty fuses! Robbery!!!

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I know there is a whole thread about this so I won’t labour the point, but for me Purple SR fuse made a positive improvement to my P20, Orange SR made a negative impact. Also according to my uk dist, they have life time guarantee

Gee Al, with all you have invested in your gear…you need to get on with it
and try a purple fuse…all you need is the main fuse on your P20 to start with,
then very patiently go through the burn in cycle…

You will wonder why you didn’t do it sooner…Resitance Is Futile !! :grinning_face_with_smiling_eyes: :grin: :innocent:

Get on with it guy…give it a shot!!

Best wishes Al…

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I’m curious about the absorber sheet on the P20. If it’s eliminating radiant noise, how is it improving the sound of the P20? Or are you stacking components on top of or very close to your P20?

I, too am trying to understand what this helps with practically.

Posted this earlier:

"And, what does it protect (how does it reduce noise or whatever) by absorbing the EMF?

For example, is it a matter of diverting the EMF from the innards that can affect power pulled from the outlets? And/or does it serve as a sink protecting nearby equipment from the EMF?"

I have not received a direct response so far.

I don’t doubt the potential benefits of this type of shielding/absorption, just looking for some better clarity/understanding here.


I cannot believe Gryphon uses such cheap fuses! Just cannot believe it. I think PSA came with high quality fuses.

Please review its data sheet. At link below.

It works inside an enclosure as well as outside. Its not going to absorb longer frequency or non electro magnetic emissions outside the unit but ulra high frequency ones yes it will since they go through small holes or gaps or a magnetic field through metals.

Details from 3M site.

  • Flexible, high permeability magnetic sheets
  • One-sided acrylic pressure-sensitive adhesive
  • Low Halogen version of AB7000 series absorbers.
  • Less than 900 ppm bromine and chlorine
  • Less that 1500 ppm total bromine and chlorine
  • Meets guidelines set forth in IEC 61249-2-21.
  • Easily die cut into complex shapes
  • Consists of a flexible polymer resin loaded with soft metal flakes
  • Acrylic pressure-sensitive adhesive allows for easy application
  • Improved lower frequency absorber vs. the AB5000 or AB5000S series (@ < 1 GHz)
  • Reduce EMI and RF noise in electronic systems
  • Apply to noisy traces, IC’s and reflective surfaces in an enclosure

3M™ EMI Absorber AB7050HF. This low-halogen, flexible, high-permeability magnetic sheet is a broadband absorber for near-field applications in the 50 MHz-10 GHz range. Easily die cut. Backing thickness of 0.55 mm.

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If I may ask. How did the orange fuse make a negative impact? Negative over stack? Or negative over purple? Thank you.