Got it, thanks. I’ll start with the RF sheet on the P20.
I tuned absorber rings with this song last night for the M-1s. Things just happened everywhere in the room once it was adjusted to optimum sound The bass comes from every where you are totally enveloped in the soundstage. Nothing nasally weak or limp from percussion, instruments to vocals. Get this song right everything else follows. The three M-1s go from sedate and refined to incredible and alive All achieved with 12 watt peaks i was playing with preamp level 39. Before it took level 50 with 3 M-1 fuses just to start feeling bass. The tuning ring is the key. My theory is EMI and RF kills music depth and breadth it must steal gobs of power to amplify frequencies we can’t hear. Strip them out and music just breathes and flows and immerses you. I heard it at front of the room moving the tuning ring it was like doubling sound pressure. Whereas the volume was stable.
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After installing third M-1, I had to reduce the absorbent sheet in P15, and I removed the absorbent tapes all together under PST. I adjusted the ring a bit away from Dragon plug, and that brought the system to a great balance and better sound.
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I forgot you resized for P-15. The P-20 installed internal absorber was sized and positioned right but Tuning ring on M-1 LPS for the digital switch for ethernet communications really reacted positively and returned some oompf and live excitement to streamed sources including my HT. Apparently the Roon host sonic transport, ultraRendu, matrix, and DS Analog board powered by HDPLEX300 M-1 fuse also reacted positively to optimized power and data stream over ethernet switch.
AC power is a funny entity on how it reacts. Too bad one fix like a regenerator or power cor, fuses doesn’t optimize it. Unfortunately their is always more that can be done iteratively. Finding the mix is easier if you search.
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Day three of M-1 number three. Everything really smoothed out Baas is still strong balance across frequencies is great.
I listened to some Hugh Stimela The Coal Train. Dynamics were incredible as was inner details and the crowd. Set at my past listening level foof 55 on preamp. The power meters were spiking 600 to 1K WPCon the peaks. Not oppressive most of the song 1 to 12 watts. Decays were incredible as was the brass.
I’d say three on the M-1 is the place to be.
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Luca, I tried to find your Italian wine suggestions but without success, at least not in Bay Area.
I drink mostly red, and my cellar has no more than ten bottles of white out of around six hundred bottles I have now. Some of the French and Cal wines were collected 40 years ago when I was just over drinking age. But it is hard for me to open them knowing I can never buy them back again.
Hi Donald,
take a look at this web site I suppose they are able to ship all over the world and they have some good brands.
or this one:
If needed I will be happy to help you (and other members interested) discussing with these Italian web sellers about shipments or other questions. Not my area of competence but happy to promote products from my country! Who knows I would become an Italian wine support for the Forum members.
PS: I’m so impressed! 600 bottles?! Wow! Congrats! When I was in CA I had to come and visit you to drink something special!
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Thanks for the sites! I have some priced Napa reds that are as good as best of French can offer. I am glad I was not a huge drunk back then, and I was able to save some to this day.
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That’s the secret of going to Napa. Bring wine from your cellar to drink while you are there buying young wine. We normally travel with a small group of 4-6 people. Everyone brings a minimum of 5 bottles each in their luggage for a four day trip. Paying corkage is so much less expensive. 
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We used to visit Napa yearly, but it is more expensive to buy wine there now, plus wineries charge a lot for wine tasting nowadays. In the good old days, most of them offered free tasting. Do my wine purchases through online or from Costco mostly. 
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I mostly go for the food. We also avoid what I call the Temples of Grape. Over the past twenty years there seems to be more and more of the massive tasting rooms that have had to cost a fortune. We generally head to the edges of the appellations and go to the smaller wineries. Especially those that have a tasting room consisting of a giant wooden wire spool for a table sitting under a tree.
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That is the part we enjoyed the most; just strolling in Sonoma and Napa counties and stopping at little wineries and restaurants.
V Suttie has a great outdoor seating area. You can buy from their grilling outdoor or food inside the store, plus nice wine of course.
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Great potato salad if I recall. 
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Not Napa, but I live a short drive from the Finger Lakes and my girl friend hails from Geneva NY at the beginning of the Seneca Lake Wine Trail
We average 6 to 8 long wknds a year…
Best,
-JP
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MANY a summer vacation was at my Uncles house on Keuka Lake !!
LOTS of winery tours on rainy days and lots of water skiing and drinking !!
GREAT memories for me, especially now at 64
Tom - NJ
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After 125 hours streaming on M-1 number three in HDPLEX300 there were no more tuning ring adjustments made. The bass and mids have great solidity and treble is well extended as is note decays. The extra fuse expense was worth it as was leaving all the purple fuses.
If anyone is interested in a purple slow blow small sized for HDPLEX300 contact me. It is a 10amp. Must remove top lid fasteners.
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I’d like to report my own findings with using the M-1 on my P20, versus the stock fuse. Those of you who’ve been on this forum since the early days of the first gen PWD know I tend to wait quite some time before reporting anything, and I tend to be understated in my descriptions, so don’t get bored. 
I keep my source gear on 24/7 (unless there’s a threat of severe weather) with a streaming signal always going through it, so this report is after some 1400 hours of use. IMO, is the M-1 better than the stock fuse? Yeeesss…, but does it do everything right for me? I’m not sure that it does, honestly. Now let me be clear that I’m judging this as a straight swap fuse for fuse. No additional tweaks - tuning rings, IC changes, different audiophile outlet, etc. The M-1 provides a blacker background, is a bit more transparent, allows for a bit more energy in the lower octaves (with a caveat, in a moment), and has better presentation of vocals. However, at least for me in my system and in the opinion of my wife and my audio buddy (both of whom have good ears), there were common observations. First, while there is a bit more umpf in the lowest octaves, it seems to come at the expense of being able as easily to pick out the individual lines down in that range. Slight, but noticeable compared to the stock fuse. My wife described it as sounding slightly more “thumpy”, or homogenized. Could it be that the slight bit of extra energy is just teetering into exacerbating a room mode in my 14’ x 16’ space? Maybe, but I’m not sure yet.
The other thing we noticed is that, with the M-1 in place - while the high frequencies seemed go up as high, in a kind of fundamental sense, there was a feeling of a slight loss or blunting of the higher overtones associated with the HFs. It doesn’t affect the speed or “PRAT” of the music, but it is fairly easy to notice. So I rotated the M-1 so the fuse “hat” was not at the top of the M, to see if that would change anything. It did, but not entirely for the better, and even with that only just slightly. It maybe opened up the HF harmonics a bit, but made everything sound less natural and with less of an easy a flow. All this is slight - no Earth shattering night and day differences, but there if one wanted to pick them out. So at least in my case the recommended orientation for the fuse worked better.
So I’m left with a bit of a dilemma - the M-1 on the whole is a better fuse, but that - at least in my system - doesn’t make it a slam dunk replacement for the stock fuse. I may need to try a Purple, but honestly if I had to live with the stock fuse, I wouldn’t be feeling like that was making mine a poor sounding system, with my standards being pretty high after a lifetime in this hobby. YMMV.
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That is an excellent report. When I added a second M-1, I had to reduce the 3M 7050 absorbent size in my P15. When I added a third, I removed all absorbent in my PST and relocated the tuning ring further away from P15. All these measures were meant to rebalance the extra energy M-1s brought.
I have 3 M-1s plus a Purple in system that balanced well after adjustments. But I think many systems may benefit more with two of each.
The rest of the day I will be busy, so it is good to see your report early.
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That is the essence of it all. We liked–or loved the sound of the thing with the stock fuse when we put it into our system. The manufacturer of the thing voiced the thing with the stock fuse. Now, suddenly, we can’t live without this magical fuse?
$250 for a fuse or 10 great sounding records or…?
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Thank you so much for your thoughts, very appreciated. As I’m using 3 M-1s too I confirm your first impressions together with dchang05 added comment.
A sort of “warm” feeling many of us already heard using one or more M-1 fuses (especially in P20) can be mitigated or balanced with our tweaks, for instance a Purple fuse in the chain.
I think it depends as usual from the system and the room (bla bla bla!)… and must of all from personal tastes. Like comparing different tube models.
IMO the M-1s are keeper in my system (P20 + SPP + BHK Pre) for analog music but I feel a better sound with a Purple in PST for digital rig. Now I have ordered a second Purple for the Innuos server/streamer I recently introduced. It’s a trial and error process and I’m curious to go deeper in digital path with some more experimentations.