Wilson Audio Specialties Alexandria XLF loudspeaker Aspherical Group Delay

Sidebar 2: Aspherical Group Delay

Wilson claims that its Aspherical Group Delay technology is as effective harmonically and texturally as it is spatially, helping to precisely reintegrate, at the listening position, the frequencies that have been separated by the crossover and sent to the various drivers.

To do this, each of the three drivers in the Alexandria XLF's MTM array can be independently adjusted fore and aft, as well as rotated on its polar axis. Of equal importance, once the appropriate position has been found, each module can be rigidly locked in place with tether bolts of various lengths, secured with wing nuts. Each module is moved along a pair of rails, each with a center notched track. There's one set of rails atop the woofer box, and one set each atop the lower-midrange and tweeter cabinets. There's also an assortment of spikes of different lengths. It's a major feat of mechanical engineering and precision manufacturing that needs to be seen to be appreciated.

All you have to do is measure the distance of each drive-unit from the listening position, and the height of your ears when you're sitting down, and Wilson's charts tell you into which numbered notch each spiked module should sit, and which length of tether bolt should be used to set the module's elevation. But no, you don't do any of this—your Wilson dealer will.

The goals are to time-align the drivers so that the combination of their outputs produces the equivalent of a single point source, and, by adjusting the modules' polar axes, to precisely focus the sound propagation on the actual listening position—not at a theoretical point a set distance from the speakers dictated by a design that might not suit the realities of the room. It's sort of like the difference between cameras with fixed and adjustable lenses.—Michael Fremer

Wilson Audio Specialties
2233 Mountain Vista Lane
Provo, UT 84606
(801) 377-2233

NMMark1962's picture

WOW, what a load of TROLL CRAP here.....some people here need to get a life and if you hate Wilson so, then get the hell out of here....you will NOT convince one person with the anti-Wilson spew.....I agree with others....build us your own XLF and prove that Wilson is building garbage or perpetrating a fraud....

When your fabulous speaker is built, let me know so I can buy your wonderful effort and save myself tens of thousands....

To some of you.....quit feeding the idiotic trolls who shit all over these and other forums....i guess that these trolls were run out of the asylums for audio elsewhere...

By the way, for you Wilson haters....I am planing an ultra high end system for late this year...the XLF's are on the list...for the turd here who claims to be able to build an XLF for way less, let me know and I will add it to MY list....hehehehehe...and I bet it will sound oh so sexy.....




ABCDEFG's picture

Perhaps it would be enlightening for some here to consider the genuine economics of this situation.

Mr. Fremer did not pay $200,000 for his XLFs, whatever their cost of construction or subjective worth. In fact, it is very likely that he received a discount considerably greater than Wilson’s 40-45% retail margin.

Considering the dealer cost, it is likely that Mr. Fremer paid less than $100,000 for his pair.

Add a payment plan directly financed by Wilson Audio and a future resale value greater than the accommodation price and the picture of Mr. Fremer’s purchase snaps into focus with remarkable clarity.

Michael Fremer's picture

Is your obtuseness. Guess what? I can buy just about any loudspeaker known to man at an accommodation price. In fact, were I like some reviewers I could get a "long term loan" for just about any speaker known to man and just have them here for as long as I like.

However your libelous comment that there was a "payment plan directly financed by Wilson Audio" is where I tell you with no due respect to go f...k yourself.

The money came from Bank of America, not Dave Wilson or Wilson Audio.

SNI's picture

I would not pay too much attention to the speakers frequency response.
It is a very large speaker, and FR is always measured on the tweeter axis.
Low frequency measurements in smaller rooms are also questionable.
What I do find interesting is the speakers time domain behavior.
This is not very good, and I cannot imagine, that this will not ad a lot of collouration to the sound of this speaker.
It simply emits sound long time after the input signal has stopped.
In my experience this will mask the sound in a way, so that a lot of low level signal is lost.
Also the impedance of this speaker would make me worry.
Anyways I do not think this is a speaker for life, I´d believe that one would get fed up with this "Sound Of Its Own" as time goes by.

If one would like to see a clean time domain behavior, then look at the newly tested Dali Rubicon, that´s how things should behave
, if you want transparancy.


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