Now that I've had time to listen to more music, lower mids to bass are a tad more pronounced, a bit fatter, if you will. No loss of coherency or detail, but a bit more meat on the bone, or maybe a better sear since the effect is minor but the result is more flavorful.
Lordes' new CD has lots of electronic beat bass that's in vogue nowadays but now it's not so offensive, or mechanical sounding. It's still a studio recording but not a bad one.
On the other end of the scale, Quadro Nuevos' Mocca Flor (which I know inside and out) is purely acoustic and showcases what fun talented musicians can have. They can be everything from subtle to bombastic and still hold my rapt attention. Gone is the shrill bite of a horn leaving only a fluid, melodic sound no matter the level which is quite an achievement. Everything on the disc is a tad more expansive and clearer (maybe a lower noise floor?) and it's the old 'am I hearing more?' thing all over again but I've heard this CD so many times and yet it sounds more open and clearer, especially in the lower mids and bass.
To keep with the non-critical listening aspect that caught my attention the first time around, I kept the TV on with the volume off so I'd not over analyze the sound and even with my attention on the TV, aural clues of new insights to the music kept interrupting my attention.
In my first post I neglected to mention where I put these little buggers. The are supposed to work on the amps' +speaker posts, the end plug of a PC to a CDP, the input jack of a headphone and on a headphone. The only difference I think I could detect was on the +speaker post of the amp and nowhere else.
My Marantz is robustly built with lots of shielding and component isolation factored in so maybe the effects aren't as pronounced as they'd be in other makes. That could be why the effects aren't as apparent or nonexistent. It could be why the only difference I think I'm hearing is where the amp hands off to the speaker cable.
The bigger versions are claimed to work on/over the transformers of amps and CDPs and the casework of DACs and so on. It will not work on optical cables and I can't offer a clue as to why but so states the designer of the discus.
I think I just might try the bigger version.
All the best,
Nonoise