Is high frequency extension important to openness


I have noticed that speakers with exceptional tweeters to an excellent job of separating both the sections and individual instruments in an orchestra.
For example: the Mirage 490s, a $600.00 speaker, are terrific at delineating individual instruments on CD, even with as modest a system as an Arcam Alpha 7, Transparent Music Wave cabling, MIT CVT Termintor interconnects, and a JVC XL Z-1050TN CD player. In fact, the level of openness in the high frequencies give the impression of being on a catwalk peering down into the orchestra and being able to hear individual instruments "sitting" near each other.
In contrast, a considerably more high end system, say, a Marsh A400s, with Alon speakers and speaker cabling, Philips/Arcam CD player and Nordost interconnects don't show the "individuality" as well. And the room is quite well treated, thanks (for those suggesting it's room acoustics) and speaker placement is good.
Why is this so? The Mirage tweeter is an older design, but HP once averred the Mirage tweeter (a bigger model,but same line) was superb. Shouldn't a $3-5,000 speaker have better separation than a 12-year old $600.00 speaker?! And of course, I realize that technology is no guarantee of progress, but intellectually I'm curious as to what others think.
What thoughts do you have that would explain this? What speaker below $5,000 are adept at this separation? And is it simply the tweeter or is it the entire design of the speaker?
mphnkns

Showing 2 responses by warrenh

I agree with Gmood as far as the crossover goes. There are, certainly, many factors involved in speaker design, but the core is the crossover. The more speakers the more problematic. peace, warren
I cannot explain the separation thing, but I can say, that my Harmonic Precision Caravelles, are the most phase coherent, airy, beautifully extended (highs and lows), bass to die for(in a 7" woofer), in a monitor, with an amazing patent pending crossover, that I've ever heard. Whew! You can read my review in the archives about these babies. Really, quite phenominal for the size and price. peace, warren