Hi There.

I have recently acquired a c4 signature for my Living Area and I liked it very much with my NUVISTA 800.

On my main Music Room 5.0 mts x 6.5 mts with acoustic treatment and with Momentum Combo I am looking at changing my SF Lilium to SF AIDA or Evidence Platinum. I'm not sure if Evidence Platinum matches with Dags Momentums.

Any thoughts and comments are highly appreciated.

Cheers !
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Have you tried the C4's with the Dag's. That should give you an idea of how the Evidence would sound. IMO the SF will have a slightly laid back sound compared with Dynaudio's. Both are great speakers. Personally I prefer the Dyn sound of the 2.
Yeah, 'if done right' is the key. The room should be precisely tuned too, in this case especially so, I assume.
Hell, I just put one Walker resonance control disc on my Nakamichi deck, somewhere in the middle, and there was a small but noticeable improvement in clarity, and the deck already sits on Boston Audio tuneblocks. Imagine what can be done to a room and speakers together.
Inna wrote, presumably referring to what I said about reverberant energy:

"Yeah, 'if done right' is the key. The room should be précisely tuned too, in this case especially so, I assume."

Actually speakers that generate spectrally-correct (or nearly so) reverberant fields are less demanding of room acoustics, and are far less likely to need room treatment in order to sound good. This is because whether the room bounces back a little energy or a lot, it's going to enhance the experience rather than degrade it.

Let's take a grand piano as an example. Plunk a grand piano down in just about any room and it will sound great. Yes it will sound even better in a recital hall than in your living room, but you don't have to fix your living room before it will sound great right there. Why is this so? In large part because the reverberant energy of the grand piano is spectrally correct. Likewise, outside of extreme situations, a speaker that gets the reverberant field right doesn't require you to "fix" the room in order for it to sound good. But if the reverberant field is spectrally skewed because the speaker is putting out significantly more off-axis energy at some frequencies than at others, then well-thought-out room treatment becomes a much higher priority.

The choice is not between having reverberant energy in the room or not. If we're not in an anechoic chamber, it will be there. The choice is between having the reverberant energy be beneficial or detrimental, and how much so, and this is largely a function of the speakers' off-axis response characteristics.

Imo, ime, ymmv, etc.

speaker designer