Originally Posted by Alimentall
Actually, that decay time isn't nearly as good as it looks. See that treble peak? That's up about 12dB or so over the rest of the sound. That pushes the decay spectrum down by 12dB over a very accurate speaker. That's one of the things about graphs, you have to know how to interpret them properly. In the case of a Stereophile spectral decay plot, the more erratic the FR, the better the speaker looks!
But, the clean sound you get from Monitor Audio is, indeed, because of their metal drivers. In theory, the more rigid the driver, the more resolution it will have, with less added harshness *as long as* you excise the ringing that will inevitably hover not too far above the crossover frequency. Steep, and relatively low, crossovers are critical for proper use of metal drivers.
I respectfully disagree. That treble peak is at 27KHz. The last time I had my hearing checked, I was struggling to hear 16KHz. Besides, there is no music up there, and even a human with perfect hearing is not going to hear a 27KHz tone even if it is a 20dB peak.
With all due respect, I think it is you that doesn't know how to read a CSD plot. The CSD plot has very little to do with FR, yet you reference FR a couple of times in your response to me. While a nasty resonance will manifest its self as a peak or dip in the FR, that's not the point of the graph. It is meant to show the persistence of sound over time and you read it from back to front, not side to side like an FR graph. Other than the resonance at 27KHz in the MA GS10, look at how the sound "stops" almost immediately after the input signal all throughout the treble and even into the midrange. I challenge you to find a cleaner CSD plot than the MA GS line.
Heres a couple of examples for the sake of comparison:
NHT Classic 3:
See that small ridge of delayed energy between 7-10KHz? That is a resonance within the range of human hearing. (Ignore the dark ridge above 10KHz, it is a measurement error found in many of the Stereophile measurements) Also, see all of those ripples starting from 400Hz (the lower limit of the graph) on up through 3Kz? That's more delayed energy. If you look to the very far right edge of the graph you can also see the tweeter's high frequency resonace peak, it is just a bit higher than the graph allows (probably around 30KHz). Now granted, all of the resonances / delayed energy in this speaker are low in level, so they may be just barely audible, but you can now see just how remarkable clean and "fast" the Monitor Audio's are in comparison.
The treble on this speaker is pretty clean, though there is a little low-level hash in the mid-treble. But look at how the midrange driver likes to play well after the input signal has stopped.
Here is the MA GS10 again for visual reference:
There's really not much for me to comment on here. The results within the audible band speak for themselves.