Sonus Faber Guarneri vs Guarneri Memento

Semi,it is interesting that you mentioned the size of the room. My room is very small which probably has something to do with how well the GH's integrate in the room.
I cannot support much bass in the room and of course the GH's don't really do much below 50Hz's.
We AB'ed the GM to the GH in my room and while the magic in the mids was lacking, the GM did offer a little more bass response, we all figured it began to break up about 45Hz's or so.
In your bigger room, that might be valuable and possibly your GM's may go even lower. I am not a headbanger, but I also realize that music has a fundemental in the bottom octave and a certain reality that comes with being able to reproduce the lowest octave at reasonable volume with little to no distortion. The Amati A's or the Strads are probably much better in this regards than either of the G's in a larger room. (But not so good in a small room like mine)...It really is "horses for courses".

I am in the process to change (again) my amps from Gryphon to Jadis (I have done this two times now) - and heard the GM at the dealer show room with exactly the same Jadis JA50 that I am currently testing at home.

I heard the GM there and really like the presentation, great speed, coherent and great timbre - but lacking bass. Next day I hooked the JA50s to my system (GH based) and heard a very similar presentation - correct timbre- attack BUT more coherence in the low registers and a better ensamble of the whole musical reproduction.

Keep in mind that room were of a different kind (my dealers showroom is 30% larger than mine) and full of other equipment and speakers - mine is a dedicated room.

Two grains of salt to the discussion which I am enjoying a lot!.

I totally agree Daveyf - I am a big Gryphon fan, but in this particular case with my current room and sources - the Jadis brought more musicality and refinement to my system.

I kept the Jadis DA50 Signature for the moment - but after hearing what the JA50 Monos did, I am after buying them shortly.

Curious about the DA88S thou....

I owned the GH's for a long time. Upgraded to the mementos and WOW, the sound is HUGE with the M's. The GHs are way more laid back and no where near as dynamic.

the M's still have an amazing midrange but maybe not as syrupy as the GH's. My preference for looks is the GH, sound the GM's.

The reason the GH's sell so fast is that they are usually less than half the cost of the GM's and they are legendary.

I would keep both if I could but the M's stay.