Raidho C1.2 Issue with D250

[Confused]

Following further feedback here and on Audioshark regarding SAM impacting the higher frequencies, I followed this subject up again with Devialet. They told me for the first time SAM effects the ENTIRE FREQUENCY RANGE.

Can you clarify exactly what Devialet said?  The point being that SAM operates from 150Hz downwards, it does not work over the entire frequency range. 

From the Devialet white paper:

"SAM is effective on lower frequencies, up to 150Hz, yet its effects can be heard throughout the audio range"

So quite definitively, SAM operates below 150Hz.  Indeed, I have watched some 3 way speakers being SAM'ed at a Devialet event, only the bass driver was measured, so it cannot materially influence the tweeter. 

I suspect that Devialet were just reiterating the "yet its effects can be heard throughout the audio range" line, rather than implying that SAM itself operates above 150Hz?

Yes no problem here’s a specific point from their correspondence:

“SAM is design to feed every speaker with more energy and most of that energy goes to the bass drivers but some of that energy may go elsewhere. Depending on the filter, that may cause potential issues.

Therefore, please turn SAM off if the model does not match.”

This is new information to me and contrary to what I’ve been told before. It could also simply be covering their ass...


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Ummmm.....  Not the clearest of responses from a technical perspective.  Of course, one way to "feed every speaker with more energy" would be to turn the volume up a bit.  I think what they are trying to say is that SAM provides more current to the speakers, which the crossover may pass to the tweeter, but they do not actually say that, and the crossover should prevent the power going to the tweeter anyway.  Indeed, SAM is designed to limit the maximum current that goes to the bass driver to limit cone excursion and prevent overheating.  So in theory, you should be safer running SAM versus simply turning the volume up a bit.  Not worth worrying about too much now, although I suspect that you are absolute right re your very last sentence.....