Martin Logan Summit X

[chiphoust]

So... I have read the various posts about the difference between the D200 and D250 cases and the heat issue. That was a concern for me at first. But, I am not getting much heat from my system. It gets mildly warm at worst, but not good ole' Class A amp hot.

FYI. I recently had the benefit of a one (1) hour sitdowm with two (2) Devialet reps here at my dealer's store. Great guys. Very knowledgable as one might imagine. I asked about the issue. They said that the difference between the D200 and D250 is one extra 50 watt D amp module in the 250, plus the different case design to provide some extra cooling.

They told me to go with the D400 versus D250, so that I why I am where I am.

Picking up on ozthepoz's comments above, I think that there can actually be a very big difference between the 200 & 250.  I say can, rather than is, because this is very much speaker dependant.  With some speakers the difference appears to be non existent, I guess with speakers that provide easier loads.  However, I observed from my experience auditioning amps with the KEF Blades that the difference between what was then the 170 & 240 was huge, far more than you would expect from the delta in power.  It should be remembered that the different case for the 250 makes a huge difference in the cooling performance of the amp, which is in itself related to how the power supply reacts to load demands.  For me the difference was night and day in terms of dynamics and controll etc.

To be clear, I have no idea how this relates to driving ML's.  It's a case of things being rather more complex than you might think in the relationship between amplifier and any given speaker.