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Hhmmm.. how is that HD600 perform with HD800 simulation in general if I may know?
I know its impossible to get 100% accurate but if it can give you a bit SQ preview in the right way it would be helpful.
Thing is I only tried it out for kicks, but here's the thing - even if by a microphone's measurements you could apply an EQ curve (even one more complex than Accudio's) to get the HD600 to mimic the response of the HD800 on a sine wave, there are a few problems for getting the overall sound:
1) Chassis design - the HD800 has different density earpads, but more important, its chassis places the drivers forward of the ears and at an angle. Applying only EQ to the HD600 to try to mimic this is kind of like taking measurements of a Focal Stella Utopia in a large room with proper toe-in and a Chorus 714 in a small room without proper toe-in, then applying an EQ to the latter - they still won't sound the same. Of course you can just experiment with the toe-in on the 714's, but obviously you can't put enough of an angle on the HD600's drivers. (Similarly, I've seen people wonder why the same speakers in their cars that they didn't bother to custom install properly don't sound like the other guy's system no matter how much EQ tweaking he does, even if verified by a USB Microphone on sine waves)
2) Driver design, such as mass, surround excursion, efficiency, etc - Here's another problem - a sine wave isn't the same as music, it's a good measuring tool but no music sounds like that, right? So even if you can, on a sine wave, make the two sound identical, on music the HD600 might not only lack the driver toe-in angle, but it might also have more mass, so it doesn't sound as "fast" - it might relatively have longer decay than the HD800, or conversely, some may think the decay on notes on the HD800 happens too fast. Plus, the efficiency and load complexity of the drivers mean that an HD600 regardless of the EQ curve has drivers moving that way as your given amplifier can make it move. In other words, your amp is still driving an HD600, and simulating an AKG K701 for example does not mean the same amp you used it on even if it wasn't coloring the sound might actually have problems driving lower efficiency, 56ohm drivers.
In short, the best a headphone simulation on there will do is give you a hint if you
might like a certain headphone, in the way that some people may like a Grado in general but not Sennheisers or AKGs. So given what I understand in theory, I didn't really give much credence to it aside from "let's see what happens."
