Jadis JA30 Mk2, how great???

Hi Daveyf,
Its a good thing when you achieve that type of synergy.  As you know it can require some patience and trial and error.  It surprises me when some people dismiss the effect of power cables and consider them "snake oil " products.  Just as with you I've heard better quality power cables make a real improvement in the sound.  So as always to each their own. 
Charles 

Davey:
Good for you. Cables are a weird experience and all about system synergy as Charles notes. Power delivery in all parts of the country differs. I assume you have some interference living in CA. ha.
I used JPS Labs Aluminata on them and I still like them on other equipment. To each his own.
Best of Luck.
Gary

Thanks guys. Last night I had a long listening session..and one that was quite amazing. I managed to add my two REL subs ( after having custom cables built for me by Frank at Signal) and got them dialed in. The result with the new Jadis being powered by the Art Audio cables and the subs now in the room, was a sound that easily surpassed anything that I have managed before. Right now I am pretty happy!
When you get it right, the question becomes is it wise to get off the bandwagon, or continue to tweek....hmmm??

Like you guys correctly point out, synergy is so darned important in this hobby. But wow, once it all locks in...:0)

Daveyf, 
 I find the bandwagon question to be overwhelmingly based on one's personality makeup. Some people once they've reached a level of deep satisfaction can stop and enjoy the music (This describes me).  Others no matter how well their system sounds just can't resist the urge to change or meddle.  So it all depends on one's psychology it seems. I make a distinction between fine tuning tweaking and constantly changing major system components. Bottom line,  follow your heart 😊.
Charles 

As an owner of Jadis amplifiers, I also obviously feel they offer beautiful, glorious sound.

In addition to your power cord experience, I've found they show as much sensitivity to tube rolling as any amplifiers I've come across.  It amazes me how far you can push the sound in whatever direction you want to head.  Driver and output tubes more so than the input, and I recommend starting with them, though the input tubes also definitely need attention.  As time passes, you should experiment.  You can REALLY improve things from where the factory starts